Combine IR instruction dispatch for all assembler backends.

5 files changed, 454 insertions, 654 deletions

diff --git a/src/lj_asm.c b/src/lj_asm.c
index 231e76fc..7ebde7b8 100644
--- a/src/lj_asm.c
+++ b/src/lj_asm.c
@@ -1515,6 +1515,124 @@ static void asm_loop(ASMState *as)
 #error "Missing assembler for target CPU"
 #endif
 
+/* -- Instruction dispatch ------------------------------------------------ */
+
+/* Assemble a single instruction. */
+static void asm_ir(ASMState *as, IRIns *ir)
+{
+  switch ((IROp)ir->o) {
+  /* Miscellaneous ops. */
+  case IR_LOOP: asm_loop(as); break;
+  case IR_NOP: case IR_XBAR: lua_assert(!ra_used(ir)); break;
+  case IR_USE:
+    ra_alloc1(as, ir->op1, irt_isfp(ir->t) ? RSET_FPR : RSET_GPR); break;
+  case IR_PHI: asm_phi(as, ir); break;
+  case IR_HIOP: asm_hiop(as, ir); break;
+  case IR_GCSTEP: asm_gcstep(as, ir); break;
+
+  /* Guarded assertions. */
+  case IR_LT: case IR_GE: case IR_LE: case IR_GT:
+  case IR_ULT: case IR_UGE: case IR_ULE: case IR_UGT:
+  case IR_ABC:
+    asm_comp(as, ir);
+    break;
+  case IR_EQ: case IR_NE:
+    if ((ir-1)->o == IR_HREF && ir->op1 == as->curins-1) {
+      as->curins--;
+      asm_href(as, ir-1, (IROp)ir->o);
+    } else {
+      asm_equal(as, ir);
+    }
+    break;
+
+  case IR_RETF: asm_retf(as, ir); break;
+
+  /* Bit ops. */
+  case IR_BNOT: asm_bnot(as, ir); break;
+  case IR_BSWAP: asm_bswap(as, ir); break;
+  case IR_BAND: asm_band(as, ir); break;
+  case IR_BOR: asm_bor(as, ir); break;
+  case IR_BXOR: asm_bxor(as, ir); break;
+  case IR_BSHL: asm_bshl(as, ir); break;
+  case IR_BSHR: asm_bshr(as, ir); break;
+  case IR_BSAR: asm_bsar(as, ir); break;
+  case IR_BROL: asm_brol(as, ir); break;
+  case IR_BROR: asm_bror(as, ir); break;
+
+  /* Arithmetic ops. */
+  case IR_ADD: asm_add(as, ir); break;
+  case IR_SUB: asm_sub(as, ir); break;
+  case IR_MUL: asm_mul(as, ir); break;
+  case IR_DIV: asm_div(as, ir); break;
+  case IR_MOD: asm_mod(as, ir); break;
+  case IR_POW: asm_pow(as, ir); break;
+  case IR_NEG: asm_neg(as, ir); break;
+  case IR_ABS: asm_abs(as, ir); break;
+  case IR_ATAN2: asm_atan2(as, ir); break;
+  case IR_LDEXP: asm_ldexp(as, ir); break;
+  case IR_MIN: asm_min(as, ir); break;
+  case IR_MAX: asm_max(as, ir); break;
+  case IR_FPMATH: asm_fpmath(as, ir); break;
+
+  /* Overflow-checking arithmetic ops. */
+  case IR_ADDOV: asm_addov(as, ir); break;
+  case IR_SUBOV: asm_subov(as, ir); break;
+  case IR_MULOV: asm_mulov(as, ir); break;
+
+  /* Memory references. */
+  case IR_AREF: asm_aref(as, ir); break;
+  case IR_HREF: asm_href(as, ir, 0); break;
+  case IR_HREFK: asm_hrefk(as, ir); break;
+  case IR_NEWREF: asm_newref(as, ir); break;
+  case IR_UREFO: case IR_UREFC: asm_uref(as, ir); break;
+  case IR_FREF: asm_fref(as, ir); break;
+  case IR_STRREF: asm_strref(as, ir); break;
+
+  /* Loads and stores. */
+  case IR_ALOAD: case IR_HLOAD: case IR_ULOAD: case IR_VLOAD:
+    asm_ahuvload(as, ir);
+    break;
+  case IR_FLOAD: asm_fload(as, ir); break;
+  case IR_XLOAD: asm_xload(as, ir); break;
+  case IR_SLOAD: asm_sload(as, ir); break;
+
+  case IR_ASTORE: case IR_HSTORE: case IR_USTORE: asm_ahustore(as, ir); break;
+  case IR_FSTORE: asm_fstore(as, ir); break;
+  case IR_XSTORE: asm_xstore(as, ir); break;
+
+  /* Allocations. */
+  case IR_SNEW: case IR_XSNEW: asm_snew(as, ir); break;
+  case IR_TNEW: asm_tnew(as, ir); break;
+  case IR_TDUP: asm_tdup(as, ir); break;
+  case IR_CNEW: case IR_CNEWI: asm_cnew(as, ir); break;
+
+  /* Buffer operations. */
+  case IR_BUFHDR: asm_bufhdr(as, ir); break;
+  case IR_BUFPUT: asm_bufput(as, ir); break;
+  case IR_BUFSTR: asm_bufstr(as, ir); break;
+
+  /* Write barriers. */
+  case IR_TBAR: asm_tbar(as, ir); break;
+  case IR_OBAR: asm_obar(as, ir); break;
+
+  /* Type conversions. */
+  case IR_TOBIT: asm_tobit(as, ir); break;
+  case IR_CONV: asm_conv(as, ir); break;
+  case IR_TOSTR: asm_tostr(as, ir); break;
+  case IR_STRTO: asm_strto(as, ir); break;
+
+  /* Calls. */
+  case IR_CALLN: case IR_CALLL: case IR_CALLS: asm_call(as, ir); break;
+  case IR_CALLXS: asm_callx(as, ir); break;
+  case IR_CARG: break;
+
+  default:
+    setintV(&as->J->errinfo, ir->o);
+    lj_trace_err_info(as->J, LJ_TRERR_NYIIR);
+    break;
+  }
+}
+
 /* -- Head of trace ------------------------------------------------------- */
 
 /* Head of a root trace. */
diff --git a/src/lj_asm_arm.h b/src/lj_asm_arm.h
index 25a28bd7..039a2a9a 100644
--- a/src/lj_asm_arm.h
+++ b/src/lj_asm_arm.h
@@ -519,6 +519,8 @@ static void asm_tobit(ASMState *as, IRIns *ir)
   emit_dn(as, ARMI_VMOV_R_S, dest, (tmp & 15));
   emit_dnm(as, ARMI_VADD_D, (tmp & 15), (left & 15), (right & 15));
 }
+#else
+#define asm_tobit(as, ir)       lua_assert(0)
 #endif
 
 static void asm_conv(ASMState *as, IRIns *ir)
@@ -1038,7 +1040,7 @@ static void asm_xload(ASMState *as, IRIns *ir)
   asm_fusexref(as, asm_fxloadins(ir), dest, ir->op1, RSET_GPR, 0);
 }
 
-static void asm_xstore(ASMState *as, IRIns *ir, int32_t ofs)
+static void asm_xstore_(ASMState *as, IRIns *ir, int32_t ofs)
 {
   if (ir->r != RID_SINK) {
     Reg src = ra_alloc1(as, ir->op2,
@@ -1048,6 +1050,8 @@ static void asm_xstore(ASMState *as, IRIns *ir, int32_t ofs)
   }
 }
 
+#define asm_xstore(as, ir)      asm_xstore_(as, ir, 0)
+
 static void asm_ahuvload(ASMState *as, IRIns *ir)
 {
   int hiop = (LJ_SOFTFP && (ir+1)->o == IR_HIOP);
@@ -1324,6 +1328,42 @@ static void asm_fpunary(ASMState *as, IRIns *ir, ARMIns ai)
   Reg left = ra_hintalloc(as, ir->op1, dest, RSET_FPR);
   emit_dm(as, ai, (dest & 15), (left & 15));
 }
+
+static void asm_callround(ASMState *as, IRIns *ir, int id)
+{
+  /* The modified regs must match with the *.dasc implementation. */
+  RegSet drop = RID2RSET(RID_R0)|RID2RSET(RID_R1)|RID2RSET(RID_R2)|
+                RID2RSET(RID_R3)|RID2RSET(RID_R12);
+  RegSet of;
+  Reg dest, src;
+  ra_evictset(as, drop);
+  dest = ra_dest(as, ir, RSET_FPR);
+  emit_dnm(as, ARMI_VMOV_D_RR, RID_RETLO, RID_RETHI, (dest & 15));
+  emit_call(as, id == IRFPM_FLOOR ? (void *)lj_vm_floor_sf :
+                id == IRFPM_CEIL ? (void *)lj_vm_ceil_sf :
+                                   (void *)lj_vm_trunc_sf);
+  /* Workaround to protect argument GPRs from being used for remat. */
+  of = as->freeset;
+  as->freeset &= ~RSET_RANGE(RID_R0, RID_R1+1);
+  as->cost[RID_R0] = as->cost[RID_R1] = REGCOST(~0u, ASMREF_L);
+  src = ra_alloc1(as, ir->op1, RSET_FPR);  /* May alloc GPR to remat FPR. */
+  as->freeset |= (of & RSET_RANGE(RID_R0, RID_R1+1));
+  emit_dnm(as, ARMI_VMOV_RR_D, RID_R0, RID_R1, (src & 15));
+}
+
+static void asm_fpmath(ASMState *as, IRIns *ir)
+{
+  if (ir->op2 == IRFPM_EXP2 && asm_fpjoin_pow(as, ir))
+    return;
+  if (ir->op2 <= IRFPM_TRUNC)
+    asm_callround(as, ir, ir->op2);
+  else if (ir->op2 == IRFPM_SQRT)
+    asm_fpunary(as, ir, ARMI_VSQRT_D);
+  else
+    asm_callid(as, ir, IRCALL_lj_vm_floor + ir->op2);
+}
+#else
+#define asm_fpmath(as, ir)      lua_assert(0)
 #endif
 
 static int asm_swapops(ASMState *as, IRRef lref, IRRef rref)
@@ -1373,32 +1413,6 @@ static void asm_intop_s(ASMState *as, IRIns *ir, ARMIns ai)
   asm_intop(as, ir, ai);
 }
 
-static void asm_bitop(ASMState *as, IRIns *ir, ARMIns ai)
-{
-  if (as->flagmcp == as->mcp) {  /* Try to drop cmp r, #0. */
-    uint32_t cc = (as->mcp[1] >> 28);
-    as->flagmcp = NULL;
-    if (cc <= CC_NE) {
-      as->mcp++;
-      ai |= ARMI_S;
-    } else if (cc == CC_GE) {
-      *++as->mcp ^= ((CC_GE^CC_PL) << 28);
-      ai |= ARMI_S;
-    } else if (cc == CC_LT) {
-      *++as->mcp ^= ((CC_LT^CC_MI) << 28);
-      ai |= ARMI_S;
-    }  /* else: other conds don't work with bit ops. */
-  }
-  if (ir->op2 == 0) {
-    Reg dest = ra_dest(as, ir, RSET_GPR);
-    uint32_t m = asm_fuseopm(as, ai, ir->op1, RSET_GPR);
-    emit_d(as, ai^m, dest);
-  } else {
-    /* NYI: Turn BAND !k12 into uxtb, uxth or bfc or shl+shr. */
-    asm_intop(as, ir, ai);
-  }
-}
-
 static void asm_intneg(ASMState *as, IRIns *ir, ARMIns ai)
 {
   Reg dest = ra_dest(as, ir, RSET_GPR);
@@ -1464,6 +1478,26 @@ static void asm_mul(ASMState *as, IRIns *ir)
   asm_intmul(as, ir);
 }
 
+#define asm_addov(as, ir)       asm_add(as, ir)
+#define asm_subov(as, ir)       asm_sub(as, ir)
+#define asm_mulov(as, ir)       asm_mul(as, ir)
+
+#if LJ_SOFTFP
+#define asm_div(as, ir)         lua_assert(0)
+#define asm_pow(as, ir)         lua_assert(0)
+#define asm_abs(as, ir)         lua_assert(0)
+#define asm_atan2(as, ir)       lua_assert(0)
+#define asm_ldexp(as, ir)       lua_assert(0)
+#else
+#define asm_div(as, ir)         asm_fparith(as, ir, ARMI_VDIV_D)
+#define asm_pow(as, ir)         asm_callid(as, ir, IRCALL_lj_vm_powi)
+#define asm_abs(as, ir)         asm_fpunary(as, ir, ARMI_VABS_D)
+#define asm_atan2(as, ir)       asm_callid(as, ir, IRCALL_atan2)
+#define asm_ldexp(as, ir)       asm_callid(as, ir, IRCALL_ldexp)
+#endif
+
+#define asm_mod(as, ir)         asm_callid(as, ir, IRCALL_lj_vm_modi)
+
 static void asm_neg(ASMState *as, IRIns *ir)
 {
 #if !LJ_SOFTFP
@@ -1475,31 +1509,35 @@ static void asm_neg(ASMState *as, IRIns *ir)
   asm_intneg(as, ir, ARMI_RSB);
 }
 
-#if !LJ_SOFTFP
-static void asm_callround(ASMState *as, IRIns *ir, int id)
+static void asm_bitop(ASMState *as, IRIns *ir, ARMIns ai)
 {
-  /* The modified regs must match with the *.dasc implementation. */
-  RegSet drop = RID2RSET(RID_R0)|RID2RSET(RID_R1)|RID2RSET(RID_R2)|
-                RID2RSET(RID_R3)|RID2RSET(RID_R12);
-  RegSet of;
-  Reg dest, src;
-  ra_evictset(as, drop);
-  dest = ra_dest(as, ir, RSET_FPR);
-  emit_dnm(as, ARMI_VMOV_D_RR, RID_RETLO, RID_RETHI, (dest & 15));
-  emit_call(as, id == IRFPM_FLOOR ? (void *)lj_vm_floor_sf :
-                id == IRFPM_CEIL ? (void *)lj_vm_ceil_sf :
-                                   (void *)lj_vm_trunc_sf);
-  /* Workaround to protect argument GPRs from being used for remat. */
-  of = as->freeset;
-  as->freeset &= ~RSET_RANGE(RID_R0, RID_R1+1);
-  as->cost[RID_R0] = as->cost[RID_R1] = REGCOST(~0u, ASMREF_L);
-  src = ra_alloc1(as, ir->op1, RSET_FPR);  /* May alloc GPR to remat FPR. */
-  as->freeset |= (of & RSET_RANGE(RID_R0, RID_R1+1));
-  emit_dnm(as, ARMI_VMOV_RR_D, RID_R0, RID_R1, (src & 15));
+  if (as->flagmcp == as->mcp) {  /* Try to drop cmp r, #0. */
+    uint32_t cc = (as->mcp[1] >> 28);
+    as->flagmcp = NULL;
+    if (cc <= CC_NE) {
+      as->mcp++;
+      ai |= ARMI_S;
+    } else if (cc == CC_GE) {
+      *++as->mcp ^= ((CC_GE^CC_PL) << 28);
+      ai |= ARMI_S;
+    } else if (cc == CC_LT) {
+      *++as->mcp ^= ((CC_LT^CC_MI) << 28);
+      ai |= ARMI_S;
+    }  /* else: other conds don't work with bit ops. */
+  }
+  if (ir->op2 == 0) {
+    Reg dest = ra_dest(as, ir, RSET_GPR);
+    uint32_t m = asm_fuseopm(as, ai, ir->op1, RSET_GPR);
+    emit_d(as, ai^m, dest);
+  } else {
+    /* NYI: Turn BAND !k12 into uxtb, uxth or bfc or shl+shr. */
+    asm_intop(as, ir, ai);
+  }
 }
-#endif
 
-static void asm_bitswap(ASMState *as, IRIns *ir)
+#define asm_bnot(as, ir)        asm_bitop(as, ir, ARMI_MVN)
+
+static void asm_bswap(ASMState *as, IRIns *ir)
 {
   Reg dest = ra_dest(as, ir, RSET_GPR);
   Reg left = ra_alloc1(as, ir->op1, RSET_GPR);
@@ -1516,6 +1554,10 @@ static void asm_bitswap(ASMState *as, IRIns *ir)
   }
 }
 
+#define asm_band(as, ir)        asm_bitop(as, ir, ARMI_AND)
+#define asm_bor(as, ir)         asm_bitop(as, ir, ARMI_ORR)
+#define asm_bxor(as, ir)        asm_bitop(as, ir, ARMI_EOR)
+
 static void asm_bitshift(ASMState *as, IRIns *ir, ARMShift sh)
 {
   if (irref_isk(ir->op2)) {  /* Constant shifts. */
@@ -1533,6 +1575,12 @@ static void asm_bitshift(ASMState *as, IRIns *ir, ARMShift sh)
   }
 }
 
+#define asm_bshl(as, ir)        asm_bitshift(as, ir, ARMSH_LSL)
+#define asm_bshr(as, ir)        asm_bitshift(as, ir, ARMSH_LSR)
+#define asm_bsar(as, ir)        asm_bitshift(as, ir, ARMSH_ASR)
+#define asm_bror(as, ir)        asm_bitshift(as, ir, ARMSH_ROR)
+#define asm_brol(as, ir)        lua_assert(0)
+
 static void asm_intmin_max(ASMState *as, IRIns *ir, int cc)
 {
   uint32_t kcmp = 0, kmov = 0;
@@ -1606,6 +1654,9 @@ static void asm_min_max(ASMState *as, IRIns *ir, int cc, int fcc)
     asm_intmin_max(as, ir, cc);
 }
 
+#define asm_min(as, ir)         asm_min_max(as, ir, CC_GT, CC_HI)
+#define asm_max(as, ir)         asm_min_max(as, ir, CC_LT, CC_LO)
+
 /* -- Comparisons --------------------------------------------------------- */
 
 /* Map of comparisons to flags. ORDER IR. */
@@ -1721,6 +1772,18 @@ notst:
     as->flagmcp = as->mcp;  /* Allow elimination of the compare. */
 }
 
+static void asm_comp(ASMState *as, IRIns *ir)
+{
+#if !LJ_SOFTFP
+  if (irt_isnum(ir->t))
+    asm_fpcomp(as, ir);
+  else
+#endif
+    asm_intcomp(as, ir);
+}
+
+#define asm_equal(as, ir)       asm_comp(as, ir)
+
 #if LJ_HASFFI
 /* 64 bit integer comparisons. */
 static void asm_int64comp(ASMState *as, IRIns *ir)
@@ -1795,7 +1858,7 @@ static void asm_hiop(ASMState *as, IRIns *ir)
 #endif
   } else if ((ir-1)->o == IR_XSTORE) {
     if ((ir-1)->r != RID_SINK)
-      asm_xstore(as, ir, 4);
+      asm_xstore_(as, ir, 4);
     return;
   }
   if (!usehi) return;  /* Skip unused hiword op for all remaining ops. */
@@ -2064,141 +2127,6 @@ static void asm_tail_prep(ASMState *as)
   *p = 0;  /* Prevent load/store merging. */
 }
 
-/* -- Instruction dispatch ------------------------------------------------ */
-
-/* Assemble a single instruction. */
-static void asm_ir(ASMState *as, IRIns *ir)
-{
-  switch ((IROp)ir->o) {
-  /* Miscellaneous ops. */
-  case IR_LOOP: asm_loop(as); break;
-  case IR_NOP: case IR_XBAR: lua_assert(!ra_used(ir)); break;
-  case IR_USE:
-    ra_alloc1(as, ir->op1, irt_isfp(ir->t) ? RSET_FPR : RSET_GPR); break;
-  case IR_PHI: asm_phi(as, ir); break;
-  case IR_HIOP: asm_hiop(as, ir); break;
-  case IR_GCSTEP: asm_gcstep(as, ir); break;
-
-  /* Guarded assertions. */
-  case IR_EQ: case IR_NE:
-    if ((ir-1)->o == IR_HREF && ir->op1 == as->curins-1) {
-      as->curins--;
-      asm_href(as, ir-1, (IROp)ir->o);
-      break;
-    }
-    /* fallthrough */
-  case IR_LT: case IR_GE: case IR_LE: case IR_GT:
-  case IR_ULT: case IR_UGE: case IR_ULE: case IR_UGT:
-  case IR_ABC:
-#if !LJ_SOFTFP
-    if (irt_isnum(ir->t)) { asm_fpcomp(as, ir); break; }
-#endif
-    asm_intcomp(as, ir);
-    break;
-
-  case IR_RETF: asm_retf(as, ir); break;
-
-  /* Bit ops. */
-  case IR_BNOT: asm_bitop(as, ir, ARMI_MVN); break;
-  case IR_BSWAP: asm_bitswap(as, ir); break;
-
-  case IR_BAND: asm_bitop(as, ir, ARMI_AND); break;
-  case IR_BOR:  asm_bitop(as, ir, ARMI_ORR); break;
-  case IR_BXOR: asm_bitop(as, ir, ARMI_EOR); break;
-
-  case IR_BSHL: asm_bitshift(as, ir, ARMSH_LSL); break;
-  case IR_BSHR: asm_bitshift(as, ir, ARMSH_LSR); break;
-  case IR_BSAR: asm_bitshift(as, ir, ARMSH_ASR); break;
-  case IR_BROR: asm_bitshift(as, ir, ARMSH_ROR); break;
-  case IR_BROL: lua_assert(0); break;
-
-  /* Arithmetic ops. */
-  case IR_ADD: case IR_ADDOV: asm_add(as, ir); break;
-  case IR_SUB: case IR_SUBOV: asm_sub(as, ir); break;
-  case IR_MUL: case IR_MULOV: asm_mul(as, ir); break;
-  case IR_MOD: asm_callid(as, ir, IRCALL_lj_vm_modi); break;
-  case IR_NEG: asm_neg(as, ir); break;
-
-#if LJ_SOFTFP
-  case IR_DIV: case IR_POW: case IR_ABS:
-  case IR_ATAN2: case IR_LDEXP: case IR_FPMATH: case IR_TOBIT:
-    lua_assert(0);  /* Unused for LJ_SOFTFP. */
-    break;
-#else
-  case IR_DIV: asm_fparith(as, ir, ARMI_VDIV_D); break;
-  case IR_POW: asm_callid(as, ir, IRCALL_lj_vm_powi); break;
-  case IR_ABS: asm_fpunary(as, ir, ARMI_VABS_D); break;
-  case IR_ATAN2: asm_callid(as, ir, IRCALL_atan2); break;
-  case IR_LDEXP: asm_callid(as, ir, IRCALL_ldexp); break;
-  case IR_FPMATH:
-    if (ir->op2 == IRFPM_EXP2 && asm_fpjoin_pow(as, ir))
-      break;
-    if (ir->op2 <= IRFPM_TRUNC)
-      asm_callround(as, ir, ir->op2);
-    else if (ir->op2 == IRFPM_SQRT)
-      asm_fpunary(as, ir, ARMI_VSQRT_D);
-    else
-      asm_callid(as, ir, IRCALL_lj_vm_floor + ir->op2);
-    break;
-  case IR_TOBIT: asm_tobit(as, ir); break;
-#endif
-
-  case IR_MIN: asm_min_max(as, ir, CC_GT, CC_HI); break;
-  case IR_MAX: asm_min_max(as, ir, CC_LT, CC_LO); break;
-
-  /* Memory references. */
-  case IR_AREF: asm_aref(as, ir); break;
-  case IR_HREF: asm_href(as, ir, 0); break;
-  case IR_HREFK: asm_hrefk(as, ir); break;
-  case IR_NEWREF: asm_newref(as, ir); break;
-  case IR_UREFO: case IR_UREFC: asm_uref(as, ir); break;
-  case IR_FREF: asm_fref(as, ir); break;
-  case IR_STRREF: asm_strref(as, ir); break;
-
-  /* Loads and stores. */
-  case IR_ALOAD: case IR_HLOAD: case IR_ULOAD: case IR_VLOAD:
-    asm_ahuvload(as, ir);
-    break;
-  case IR_FLOAD: asm_fload(as, ir); break;
-  case IR_XLOAD: asm_xload(as, ir); break;
-  case IR_SLOAD: asm_sload(as, ir); break;
-
-  case IR_ASTORE: case IR_HSTORE: case IR_USTORE: asm_ahustore(as, ir); break;
-  case IR_FSTORE: asm_fstore(as, ir); break;
-  case IR_XSTORE: asm_xstore(as, ir, 0); break;
-
-  /* Allocations. */
-  case IR_SNEW: case IR_XSNEW: asm_snew(as, ir); break;
-  case IR_TNEW: asm_tnew(as, ir); break;
-  case IR_TDUP: asm_tdup(as, ir); break;
-  case IR_CNEW: case IR_CNEWI: asm_cnew(as, ir); break;
-
-  /* Buffer operations. */
-  case IR_BUFHDR: asm_bufhdr(as, ir); break;
-  case IR_BUFPUT: asm_bufput(as, ir); break;
-  case IR_BUFSTR: asm_bufstr(as, ir); break;
-
-  /* Write barriers. */
-  case IR_TBAR: asm_tbar(as, ir); break;
-  case IR_OBAR: asm_obar(as, ir); break;
-
-  /* Type conversions. */
-  case IR_CONV: asm_conv(as, ir); break;
-  case IR_TOSTR: asm_tostr(as, ir); break;
-  case IR_STRTO: asm_strto(as, ir); break;
-
-  /* Calls. */
-  case IR_CALLN: case IR_CALLL: case IR_CALLS: asm_call(as, ir); break;
-  case IR_CALLXS: asm_callx(as, ir); break;
-  case IR_CARG: break;
-
-  default:
-    setintV(&as->J->errinfo, ir->o);
-    lj_trace_err_info(as->J, LJ_TRERR_NYIIR);
-    break;
-  }
-}
-
 /* -- Trace setup --------------------------------------------------------- */
 
 /* Ensure there are enough stack slots for call arguments. */
diff --git a/src/lj_asm_mips.h b/src/lj_asm_mips.h
index cbbd2966..122e5ecd 100644
--- a/src/lj_asm_mips.h
+++ b/src/lj_asm_mips.h
@@ -849,7 +849,7 @@ static void asm_xload(ASMState *as, IRIns *ir)
   asm_fusexref(as, asm_fxloadins(ir), dest, ir->op1, RSET_GPR, 0);
 }
 
-static void asm_xstore(ASMState *as, IRIns *ir, int32_t ofs)
+static void asm_xstore_(ASMState *as, IRIns *ir, int32_t ofs)
 {
   if (ir->r != RID_SINK) {
     Reg src = ra_alloc1z(as, ir->op2, irt_isfp(ir->t) ? RSET_FPR : RSET_GPR);
@@ -858,6 +858,8 @@ static void asm_xstore(ASMState *as, IRIns *ir, int32_t ofs)
   }
 }
 
+#define asm_xstore(as, ir)      asm_xstore_(as, ir, 0)
+
 static void asm_ahuvload(ASMState *as, IRIns *ir)
 {
   IRType1 t = ir->t;
@@ -1083,6 +1085,18 @@ static void asm_fpunary(ASMState *as, IRIns *ir, MIPSIns mi)
   emit_fg(as, mi, dest, left);
 }
 
+static void asm_fpmath(ASMState *as, IRIns *ir)
+{
+  if (ir->op2 == IRFPM_EXP2 && asm_fpjoin_pow(as, ir))
+    return;
+  if (ir->op2 <= IRFPM_TRUNC)
+    asm_callround(as, ir, IRCALL_lj_vm_floor + ir->op2);
+  else if (ir->op2 == IRFPM_SQRT)
+    asm_fpunary(as, ir, MIPSI_SQRT_D);
+  else
+    asm_callid(as, ir, IRCALL_lj_vm_floor + ir->op2);
+}
+
 static void asm_add(ASMState *as, IRIns *ir)
 {
   if (irt_isnum(ir->t)) {
@@ -1126,6 +1140,10 @@ static void asm_mul(ASMState *as, IRIns *ir)
   }
 }
 
+#define asm_div(as, ir)         asm_fparith(as, ir, MIPSI_DIV_D)
+#define asm_mod(as, ir)         asm_callid(as, ir, IRCALL_lj_vm_modi)
+#define asm_pow(as, ir)         asm_callid(as, ir, IRCALL_lj_vm_powi)
+
 static void asm_neg(ASMState *as, IRIns *ir)
 {
   if (irt_isnum(ir->t)) {
@@ -1137,6 +1155,10 @@ static void asm_neg(ASMState *as, IRIns *ir)
   }
 }
 
+#define asm_abs(as, ir)         asm_fpunary(as, ir, MIPSI_ABS_D)
+#define asm_atan2(as, ir)       asm_callid(as, ir, IRCALL_atan2)
+#define asm_ldexp(as, ir)       asm_callid(as, ir, IRCALL_ldexp)
+
 static void asm_arithov(ASMState *as, IRIns *ir)
 {
   Reg right, left, tmp, dest = ra_dest(as, ir, RSET_GPR);
@@ -1170,6 +1192,9 @@ static void asm_arithov(ASMState *as, IRIns *ir)
     emit_move(as, RID_TMP, dest == left ? left : right);
 }
 
+#define asm_addov(as, ir)       asm_arithov(as, ir)
+#define asm_subov(as, ir)       asm_arithov(as, ir)
+
 static void asm_mulov(ASMState *as, IRIns *ir)
 {
 #if LJ_DUALNUM
@@ -1263,7 +1288,7 @@ static void asm_neg64(ASMState *as, IRIns *ir)
 }
 #endif
 
-static void asm_bitnot(ASMState *as, IRIns *ir)
+static void asm_bnot(ASMState *as, IRIns *ir)
 {
   Reg left, right, dest = ra_dest(as, ir, RSET_GPR);
   IRIns *irl = IR(ir->op1);
@@ -1277,7 +1302,7 @@ static void asm_bitnot(ASMState *as, IRIns *ir)
   emit_dst(as, MIPSI_NOR, dest, left, right);
 }
 
-static void asm_bitswap(ASMState *as, IRIns *ir)
+static void asm_bswap(ASMState *as, IRIns *ir)
 {
   Reg dest = ra_dest(as, ir, RSET_GPR);
   Reg left = ra_alloc1(as, ir->op1, RSET_GPR);
@@ -1313,6 +1338,10 @@ static void asm_bitop(ASMState *as, IRIns *ir, MIPSIns mi, MIPSIns mik)
   emit_dst(as, mi, dest, left, right);
 }
 
+#define asm_band(as, ir)        asm_bitop(as, ir, MIPSI_AND, MIPSI_ANDI)
+#define asm_bor(as, ir)         asm_bitop(as, ir, MIPSI_OR, MIPSI_ORI)
+#define asm_bxor(as, ir)        asm_bitop(as, ir, MIPSI_XOR, MIPSI_XORI)
+
 static void asm_bitshift(ASMState *as, IRIns *ir, MIPSIns mi, MIPSIns mik)
 {
   Reg dest = ra_dest(as, ir, RSET_GPR);
@@ -1326,7 +1355,12 @@ static void asm_bitshift(ASMState *as, IRIns *ir, MIPSIns mi, MIPSIns mik)
   }
 }
 
-static void asm_bitror(ASMState *as, IRIns *ir)
+#define asm_bshl(as, ir)        asm_bitshift(as, ir, MIPSI_SLLV, MIPSI_SLL)
+#define asm_bshr(as, ir)        asm_bitshift(as, ir, MIPSI_SRLV, MIPSI_SRL)
+#define asm_bsar(as, ir)        asm_bitshift(as, ir, MIPSI_SRAV, MIPSI_SRA)
+#define asm_brol(as, ir)        lua_assert(0)
+
+static void asm_bror(ASMState *as, IRIns *ir)
 {
   if ((as->flags & JIT_F_MIPS32R2)) {
     asm_bitshift(as, ir, MIPSI_ROTRV, MIPSI_ROTR);
@@ -1375,6 +1409,9 @@ static void asm_min_max(ASMState *as, IRIns *ir, int ismax)
   }
 }
 
+#define asm_min(as, ir)         asm_min_max(as, ir, 0)
+#define asm_max(as, ir)         asm_min_max(as, ir, 1)
+
 /* -- Comparisons --------------------------------------------------------- */
 
 static void asm_comp(ASMState *as, IRIns *ir)
@@ -1412,7 +1449,7 @@ static void asm_comp(ASMState *as, IRIns *ir)
   }
 }
 
-static void asm_compeq(ASMState *as, IRIns *ir)
+static void asm_equal(ASMState *as, IRIns *ir)
 {
   Reg right, left = ra_alloc2(as, ir, irt_isnum(ir->t) ? RSET_FPR : RSET_GPR);
   right = (left >> 8); left &= 255;
@@ -1486,8 +1523,8 @@ static void asm_hiop(ASMState *as, IRIns *ir)
   } else if ((ir-1)->o == IR_XSTORE) {
     as->curins--;  /* Handle both stores here. */
     if ((ir-1)->r != RID_SINK) {
-      asm_xstore(as, ir, LJ_LE ? 4 : 0);
-      asm_xstore(as, ir-1, LJ_LE ? 0 : 4);
+      asm_xstore_(as, ir, LJ_LE ? 4 : 0);
+      asm_xstore_(as, ir-1, LJ_LE ? 0 : 4);
     }
     return;
   }
@@ -1683,136 +1720,6 @@ static void asm_tail_prep(ASMState *as)
   as->invmcp = as->loopref ? as->mcp : NULL;
 }
 
-/* -- Instruction dispatch ------------------------------------------------ */
-
-/* Assemble a single instruction. */
-static void asm_ir(ASMState *as, IRIns *ir)
-{
-  switch ((IROp)ir->o) {
-  /* Miscellaneous ops. */
-  case IR_LOOP: asm_loop(as); break;
-  case IR_NOP: case IR_XBAR: lua_assert(!ra_used(ir)); break;
-  case IR_USE:
-    ra_alloc1(as, ir->op1, irt_isfp(ir->t) ? RSET_FPR : RSET_GPR); break;
-  case IR_PHI: asm_phi(as, ir); break;
-  case IR_HIOP: asm_hiop(as, ir); break;
-  case IR_GCSTEP: asm_gcstep(as, ir); break;
-
-  /* Guarded assertions. */
-  case IR_EQ: case IR_NE:
-    if ((ir-1)->o == IR_HREF && ir->op1 == as->curins-1) {
-      as->curins--;
-      asm_href(as, ir-1, (IROp)ir->o);
-      break;
-    }
-    asm_compeq(as, ir);
-    break;
-  case IR_LT: case IR_GE: case IR_LE: case IR_GT:
-  case IR_ULT: case IR_UGE: case IR_ULE: case IR_UGT:
-  case IR_ABC:
-    asm_comp(as, ir);
-    break;
-
-  case IR_RETF: asm_retf(as, ir); break;
-
-  /* Bit ops. */
-  case IR_BNOT: asm_bitnot(as, ir); break;
-  case IR_BSWAP: asm_bitswap(as, ir); break;
-
-  case IR_BAND: asm_bitop(as, ir, MIPSI_AND, MIPSI_ANDI); break;
-  case IR_BOR:  asm_bitop(as, ir, MIPSI_OR, MIPSI_ORI); break;
-  case IR_BXOR: asm_bitop(as, ir, MIPSI_XOR, MIPSI_XORI); break;
-
-  case IR_BSHL: asm_bitshift(as, ir, MIPSI_SLLV, MIPSI_SLL); break;
-  case IR_BSHR: asm_bitshift(as, ir, MIPSI_SRLV, MIPSI_SRL); break;
-  case IR_BSAR: asm_bitshift(as, ir, MIPSI_SRAV, MIPSI_SRA); break;
-  case IR_BROL: lua_assert(0); break;
-  case IR_BROR: asm_bitror(as, ir); break;
-
-  /* Arithmetic ops. */
-  case IR_ADD: asm_add(as, ir); break;
-  case IR_SUB: asm_sub(as, ir); break;
-  case IR_MUL: asm_mul(as, ir); break;
-  case IR_DIV: asm_fparith(as, ir, MIPSI_DIV_D); break;
-  case IR_MOD: asm_callid(as, ir, IRCALL_lj_vm_modi); break;
-  case IR_POW: asm_callid(as, ir, IRCALL_lj_vm_powi); break;
-  case IR_NEG: asm_neg(as, ir); break;
-
-  case IR_ABS: asm_fpunary(as, ir, MIPSI_ABS_D); break;
-  case IR_ATAN2: asm_callid(as, ir, IRCALL_atan2); break;
-  case IR_LDEXP: asm_callid(as, ir, IRCALL_ldexp); break;
-  case IR_MIN: asm_min_max(as, ir, 0); break;
-  case IR_MAX: asm_min_max(as, ir, 1); break;
-  case IR_FPMATH:
-    if (ir->op2 == IRFPM_EXP2 && asm_fpjoin_pow(as, ir))
-      break;
-    if (ir->op2 <= IRFPM_TRUNC)
-      asm_callround(as, ir, IRCALL_lj_vm_floor + ir->op2);
-    else if (ir->op2 == IRFPM_SQRT)
-      asm_fpunary(as, ir, MIPSI_SQRT_D);
-    else
-      asm_callid(as, ir, IRCALL_lj_vm_floor + ir->op2);
-    break;
-
-  /* Overflow-checking arithmetic ops. */
-  case IR_ADDOV: asm_arithov(as, ir); break;
-  case IR_SUBOV: asm_arithov(as, ir); break;
-  case IR_MULOV: asm_mulov(as, ir); break;
-
-  /* Memory references. */
-  case IR_AREF: asm_aref(as, ir); break;
-  case IR_HREF: asm_href(as, ir, 0); break;
-  case IR_HREFK: asm_hrefk(as, ir); break;
-  case IR_NEWREF: asm_newref(as, ir); break;
-  case IR_UREFO: case IR_UREFC: asm_uref(as, ir); break;
-  case IR_FREF: asm_fref(as, ir); break;
-  case IR_STRREF: asm_strref(as, ir); break;
-
-  /* Loads and stores. */
-  case IR_ALOAD: case IR_HLOAD: case IR_ULOAD: case IR_VLOAD:
-    asm_ahuvload(as, ir);
-    break;
-  case IR_FLOAD: asm_fload(as, ir); break;
-  case IR_XLOAD: asm_xload(as, ir); break;
-  case IR_SLOAD: asm_sload(as, ir); break;
-
-  case IR_ASTORE: case IR_HSTORE: case IR_USTORE: asm_ahustore(as, ir); break;
-  case IR_FSTORE: asm_fstore(as, ir); break;
-  case IR_XSTORE: asm_xstore(as, ir, 0); break;
-
-  /* Allocations. */
-  case IR_SNEW: case IR_XSNEW: asm_snew(as, ir); break;
-  case IR_TNEW: asm_tnew(as, ir); break;
-  case IR_TDUP: asm_tdup(as, ir); break;
-  case IR_CNEW: case IR_CNEWI: asm_cnew(as, ir); break;
-
-  /* Buffer operations. */
-  case IR_BUFHDR: asm_bufhdr(as, ir); break;
-  case IR_BUFPUT: asm_bufput(as, ir); break;
-  case IR_BUFSTR: asm_bufstr(as, ir); break;
-
-  /* Write barriers. */
-  case IR_TBAR: asm_tbar(as, ir); break;
-  case IR_OBAR: asm_obar(as, ir); break;
-
-  /* Type conversions. */
-  case IR_CONV: asm_conv(as, ir); break;
-  case IR_TOBIT: asm_tobit(as, ir); break;
-  case IR_TOSTR: asm_tostr(as, ir); break;
-  case IR_STRTO: asm_strto(as, ir); break;
-
-  /* Calls. */
-  case IR_CALLN: case IR_CALLL: case IR_CALLS: asm_call(as, ir); break;
-  case IR_CALLXS: asm_callx(as, ir); break;
-  case IR_CARG: break;
-
-  default:
-    setintV(&as->J->errinfo, ir->o);
-    lj_trace_err_info(as->J, LJ_TRERR_NYIIR);
-    break;
-  }
-}
-
 /* -- Trace setup --------------------------------------------------------- */
 
 /* Ensure there are enough stack slots for call arguments. */
diff --git a/src/lj_asm_ppc.h b/src/lj_asm_ppc.h
index 9c9c3ea4..d9174e7d 100644
--- a/src/lj_asm_ppc.h
+++ b/src/lj_asm_ppc.h
@@ -840,7 +840,7 @@ static void asm_xload(ASMState *as, IRIns *ir)
   asm_fusexref(as, asm_fxloadins(ir), dest, ir->op1, RSET_GPR, 0);
 }
 
-static void asm_xstore(ASMState *as, IRIns *ir, int32_t ofs)
+static void asm_xstore_(ASMState *as, IRIns *ir, int32_t ofs)
 {
   IRIns *irb;
   if (ir->r == RID_SINK)
@@ -857,6 +857,8 @@ static void asm_xstore(ASMState *as, IRIns *ir, int32_t ofs)
   }
 }
 
+#define asm_xstore(as, ir)      asm_xstore_(as, ir, 0)
+
 static void asm_ahuvload(ASMState *as, IRIns *ir)
 {
   IRType1 t = ir->t;
@@ -1120,6 +1122,16 @@ static void asm_fpunary(ASMState *as, IRIns *ir, PPCIns pi)
   emit_fb(as, pi, dest, left);
 }
 
+static void asm_fpmath(ASMState *as, IRIns *ir)
+{
+  if (ir->op2 == IRFPM_EXP2 && asm_fpjoin_pow(as, ir))
+    return;
+  if (ir->op2 == IRFPM_SQRT && (as->flags & JIT_F_SQRT))
+    asm_fpunary(as, ir, PPCI_FSQRT);
+  else
+    asm_callid(as, ir, IRCALL_lj_vm_floor + ir->op2);
+}
+
 static void asm_add(ASMState *as, IRIns *ir)
 {
   if (irt_isnum(ir->t)) {
@@ -1217,6 +1229,10 @@ static void asm_mul(ASMState *as, IRIns *ir)
   }
 }
 
+#define asm_div(as, ir)         asm_fparith(as, ir, PPCI_FDIV)
+#define asm_mod(as, ir)         asm_callid(as, ir, IRCALL_lj_vm_modi)
+#define asm_pow(as, ir)         asm_callid(as, ir, IRCALL_lj_vm_powi)
+
 static void asm_neg(ASMState *as, IRIns *ir)
 {
   if (irt_isnum(ir->t)) {
@@ -1235,6 +1251,10 @@ static void asm_neg(ASMState *as, IRIns *ir)
   }
 }
 
+#define asm_abs(as, ir)         asm_fpunary(as, ir, PPCI_FABS)
+#define asm_atan2(as, ir)       asm_callid(as, ir, IRCALL_atan2)
+#define asm_ldexp(as, ir)       asm_callid(as, ir, IRCALL_ldexp)
+
 static void asm_arithov(ASMState *as, IRIns *ir, PPCIns pi)
 {
   Reg dest, left, right;
@@ -1250,6 +1270,10 @@ static void asm_arithov(ASMState *as, IRIns *ir, PPCIns pi)
   emit_tab(as, pi|PPCF_DOT, dest, left, right);
 }
 
+#define asm_addov(as, ir)       asm_arithov(as, ir, PPCI_ADDO)
+#define asm_subov(as, ir)       asm_arithov(as, ir, PPCI_SUBFO)
+#define asm_mulov(as, ir)       asm_arithov(as, ir, PPCI_MULLWO)
+
 #if LJ_HASFFI
 static void asm_add64(ASMState *as, IRIns *ir)
 {
@@ -1329,7 +1353,7 @@ static void asm_neg64(ASMState *as, IRIns *ir)
 }
 #endif
 
-static void asm_bitnot(ASMState *as, IRIns *ir)
+static void asm_bnot(ASMState *as, IRIns *ir)
 {
   Reg dest, left, right;
   PPCIns pi = PPCI_NOR;
@@ -1356,7 +1380,7 @@ nofuse:
   emit_asb(as, pi, dest, left, right);
 }
 
-static void asm_bitswap(ASMState *as, IRIns *ir)
+static void asm_bswap(ASMState *as, IRIns *ir)
 {
   Reg dest = ra_dest(as, ir, RSET_GPR);
   IRIns *irx;
@@ -1377,32 +1401,6 @@ static void asm_bitswap(ASMState *as, IRIns *ir)
   }
 }
 
-static void asm_bitop(ASMState *as, IRIns *ir, PPCIns pi, PPCIns pik)
-{
-  Reg dest = ra_dest(as, ir, RSET_GPR);
-  Reg right, left = ra_hintalloc(as, ir->op1, dest, RSET_GPR);
-  if (irref_isk(ir->op2)) {
-    int32_t k = IR(ir->op2)->i;
-    Reg tmp = left;
-    if ((checku16(k) || (k & 0xffff) == 0) || (tmp = dest, !as->sectref)) {
-      if (!checku16(k)) {
-        emit_asi(as, pik ^ (PPCI_ORI ^ PPCI_ORIS), dest, tmp, (k >> 16));
-        if ((k & 0xffff) == 0) return;
-      }
-      emit_asi(as, pik, dest, left, k);
-      return;
-    }
-  }
-  /* May fail due to spills/restores above, but simplifies the logic. */
-  if (as->flagmcp == as->mcp) {
-    as->flagmcp = NULL;
-    as->mcp++;
-    pi |= PPCF_DOT;
-  }
-  right = ra_alloc1(as, ir->op2, rset_exclude(RSET_GPR, left));
-  emit_asb(as, pi, dest, left, right);
-}
-
 /* Fuse BAND with contiguous bitmask and a shift to rlwinm. */
 static void asm_fuseandsh(ASMState *as, PPCIns pi, int32_t mask, IRRef ref)
 {
@@ -1433,7 +1431,7 @@ nofuse:
   *--as->mcp = pi | PPCF_T(left);
 }
 
-static void asm_bitand(ASMState *as, IRIns *ir)
+static void asm_band(ASMState *as, IRIns *ir)
 {
   Reg dest, left, right;
   IRRef lref = ir->op1;
@@ -1488,6 +1486,35 @@ static void asm_bitand(ASMState *as, IRIns *ir)
   emit_asb(as, PPCI_AND ^ dot, dest, left, right);
 }
 
+static void asm_bitop(ASMState *as, IRIns *ir, PPCIns pi, PPCIns pik)
+{
+  Reg dest = ra_dest(as, ir, RSET_GPR);
+  Reg right, left = ra_hintalloc(as, ir->op1, dest, RSET_GPR);
+  if (irref_isk(ir->op2)) {
+    int32_t k = IR(ir->op2)->i;
+    Reg tmp = left;
+    if ((checku16(k) || (k & 0xffff) == 0) || (tmp = dest, !as->sectref)) {
+      if (!checku16(k)) {
+        emit_asi(as, pik ^ (PPCI_ORI ^ PPCI_ORIS), dest, tmp, (k >> 16));
+        if ((k & 0xffff) == 0) return;
+      }
+      emit_asi(as, pik, dest, left, k);
+      return;
+    }
+  }
+  /* May fail due to spills/restores above, but simplifies the logic. */
+  if (as->flagmcp == as->mcp) {
+    as->flagmcp = NULL;
+    as->mcp++;
+    pi |= PPCF_DOT;
+  }
+  right = ra_alloc1(as, ir->op2, rset_exclude(RSET_GPR, left));
+  emit_asb(as, pi, dest, left, right);
+}
+
+#define asm_bor(as, ir)         asm_bitop(as, ir, PPCI_OR, PPCI_ORI)
+#define asm_bxor(as, ir)        asm_bitop(as, ir, PPCI_XOR, PPCI_XORI)
+
 static void asm_bitshift(ASMState *as, IRIns *ir, PPCIns pi, PPCIns pik)
 {
   Reg dest, left;
@@ -1513,6 +1540,14 @@ static void asm_bitshift(ASMState *as, IRIns *ir, PPCIns pi, PPCIns pik)
   }
 }
 
+#define asm_bshl(as, ir)        asm_bitshift(as, ir, PPCI_SLW, 0)
+#define asm_bshr(as, ir)        asm_bitshift(as, ir, PPCI_SRW, 1)
+#define asm_bsar(as, ir)        asm_bitshift(as, ir, PPCI_SRAW, PPCI_SRAWI)
+#define asm_brol(as, ir) \
+  asm_bitshift(as, ir, PPCI_RLWNM|PPCF_MB(0)|PPCF_ME(31), \
+                       PPCI_RLWINM|PPCF_MB(0)|PPCF_ME(31))
+#define asm_bror(as, ir)        lua_assert(0)
+
 static void asm_min_max(ASMState *as, IRIns *ir, int ismax)
 {
   if (irt_isnum(ir->t)) {
@@ -1543,6 +1578,9 @@ static void asm_min_max(ASMState *as, IRIns *ir, int ismax)
   }
 }
 
+#define asm_min(as, ir)         asm_min_max(as, ir, 0)
+#define asm_max(as, ir)         asm_min_max(as, ir, 1)
+
 /* -- Comparisons --------------------------------------------------------- */
 
 #define CC_UNSIGNED     0x08    /* Unsigned integer comparison. */
@@ -1619,6 +1657,8 @@ static void asm_comp(ASMState *as, IRIns *ir)
   }
 }
 
+#define asm_equal(as, ir)       asm_comp(as, ir)
+
 #if LJ_HASFFI
 /* 64 bit integer comparisons. */
 static void asm_comp64(ASMState *as, IRIns *ir)
@@ -1664,8 +1704,8 @@ static void asm_hiop(ASMState *as, IRIns *ir)
   } else if ((ir-1)->o == IR_XSTORE) {
     as->curins--;  /* Handle both stores here. */
     if ((ir-1)->r != RID_SINK) {
-      asm_xstore(as, ir, 0);
-      asm_xstore(as, ir-1, 4);
+      asm_xstore_(as, ir, 0);
+      asm_xstore_(as, ir-1, 4);
     }
     return;
   }
@@ -1871,134 +1911,6 @@ static void asm_tail_prep(ASMState *as)
   }
 }
 
-/* -- Instruction dispatch ------------------------------------------------ */
-
-/* Assemble a single instruction. */
-static void asm_ir(ASMState *as, IRIns *ir)
-{
-  switch ((IROp)ir->o) {
-  /* Miscellaneous ops. */
-  case IR_LOOP: asm_loop(as); break;
-  case IR_NOP: case IR_XBAR: lua_assert(!ra_used(ir)); break;
-  case IR_USE:
-    ra_alloc1(as, ir->op1, irt_isfp(ir->t) ? RSET_FPR : RSET_GPR); break;
-  case IR_PHI: asm_phi(as, ir); break;
-  case IR_HIOP: asm_hiop(as, ir); break;
-  case IR_GCSTEP: asm_gcstep(as, ir); break;
-
-  /* Guarded assertions. */
-  case IR_EQ: case IR_NE:
-    if ((ir-1)->o == IR_HREF && ir->op1 == as->curins-1) {
-      as->curins--;
-      asm_href(as, ir-1, (IROp)ir->o);
-      break;
-    }
-    /* fallthrough */
-  case IR_LT: case IR_GE: case IR_LE: case IR_GT:
-  case IR_ULT: case IR_UGE: case IR_ULE: case IR_UGT:
-  case IR_ABC:
-    asm_comp(as, ir);
-    break;
-
-  case IR_RETF: asm_retf(as, ir); break;
-
-  /* Bit ops. */
-  case IR_BNOT: asm_bitnot(as, ir); break;
-  case IR_BSWAP: asm_bitswap(as, ir); break;
-
-  case IR_BAND: asm_bitand(as, ir); break;
-  case IR_BOR:  asm_bitop(as, ir, PPCI_OR, PPCI_ORI); break;
-  case IR_BXOR: asm_bitop(as, ir, PPCI_XOR, PPCI_XORI); break;
-
-  case IR_BSHL: asm_bitshift(as, ir, PPCI_SLW, 0); break;
-  case IR_BSHR: asm_bitshift(as, ir, PPCI_SRW, 1); break;
-  case IR_BSAR: asm_bitshift(as, ir, PPCI_SRAW, PPCI_SRAWI); break;
-  case IR_BROL: asm_bitshift(as, ir, PPCI_RLWNM|PPCF_MB(0)|PPCF_ME(31),
-                             PPCI_RLWINM|PPCF_MB(0)|PPCF_ME(31)); break;
-  case IR_BROR: lua_assert(0); break;
-
-  /* Arithmetic ops. */
-  case IR_ADD: asm_add(as, ir); break;
-  case IR_SUB: asm_sub(as, ir); break;
-  case IR_MUL: asm_mul(as, ir); break;
-  case IR_DIV: asm_fparith(as, ir, PPCI_FDIV); break;
-  case IR_MOD: asm_callid(as, ir, IRCALL_lj_vm_modi); break;
-  case IR_POW: asm_callid(as, ir, IRCALL_lj_vm_powi); break;
-  case IR_NEG: asm_neg(as, ir); break;
-
-  case IR_ABS: asm_fpunary(as, ir, PPCI_FABS); break;
-  case IR_ATAN2: asm_callid(as, ir, IRCALL_atan2); break;
-  case IR_LDEXP: asm_callid(as, ir, IRCALL_ldexp); break;
-  case IR_MIN: asm_min_max(as, ir, 0); break;
-  case IR_MAX: asm_min_max(as, ir, 1); break;
-  case IR_FPMATH:
-    if (ir->op2 == IRFPM_EXP2 && asm_fpjoin_pow(as, ir))
-      break;
-    if (ir->op2 == IRFPM_SQRT && (as->flags & JIT_F_SQRT))
-      asm_fpunary(as, ir, PPCI_FSQRT);
-    else
-      asm_callid(as, ir, IRCALL_lj_vm_floor + ir->op2);
-    break;
-
-  /* Overflow-checking arithmetic ops. */
-  case IR_ADDOV: asm_arithov(as, ir, PPCI_ADDO); break;
-  case IR_SUBOV: asm_arithov(as, ir, PPCI_SUBFO); break;
-  case IR_MULOV: asm_arithov(as, ir, PPCI_MULLWO); break;
-
-  /* Memory references. */
-  case IR_AREF: asm_aref(as, ir); break;
-  case IR_HREF: asm_href(as, ir, 0); break;
-  case IR_HREFK: asm_hrefk(as, ir); break;
-  case IR_NEWREF: asm_newref(as, ir); break;
-  case IR_UREFO: case IR_UREFC: asm_uref(as, ir); break;
-  case IR_FREF: asm_fref(as, ir); break;
-  case IR_STRREF: asm_strref(as, ir); break;
-
-  /* Loads and stores. */
-  case IR_ALOAD: case IR_HLOAD: case IR_ULOAD: case IR_VLOAD:
-    asm_ahuvload(as, ir);
-    break;
-  case IR_FLOAD: asm_fload(as, ir); break;
-  case IR_XLOAD: asm_xload(as, ir); break;
-  case IR_SLOAD: asm_sload(as, ir); break;
-
-  case IR_ASTORE: case IR_HSTORE: case IR_USTORE: asm_ahustore(as, ir); break;
-  case IR_FSTORE: asm_fstore(as, ir); break;
-  case IR_XSTORE: asm_xstore(as, ir, 0); break;
-
-  /* Allocations. */
-  case IR_SNEW: case IR_XSNEW: asm_snew(as, ir); break;
-  case IR_TNEW: asm_tnew(as, ir); break;
-  case IR_TDUP: asm_tdup(as, ir); break;
-  case IR_CNEW: case IR_CNEWI: asm_cnew(as, ir); break;
-
-  /* Buffer operations. */
-  case IR_BUFHDR: asm_bufhdr(as, ir); break;
-  case IR_BUFPUT: asm_bufput(as, ir); break;
-  case IR_BUFSTR: asm_bufstr(as, ir); break;
-
-  /* Write barriers. */
-  case IR_TBAR: asm_tbar(as, ir); break;
-  case IR_OBAR: asm_obar(as, ir); break;
-
-  /* Type conversions. */
-  case IR_CONV: asm_conv(as, ir); break;
-  case IR_TOBIT: asm_tobit(as, ir); break;
-  case IR_TOSTR: asm_tostr(as, ir); break;
-  case IR_STRTO: asm_strto(as, ir); break;
-
-  /* Calls. */
-  case IR_CALLN: case IR_CALLL: case IR_CALLS: asm_call(as, ir); break;
-  case IR_CALLXS: asm_callx(as, ir); break;
-  case IR_CARG: break;
-
-  default:
-    setintV(&as->J->errinfo, ir->o);
-    lj_trace_err_info(as->J, LJ_TRERR_NYIIR);
-    break;
-  }
-}
-
 /* -- Trace setup --------------------------------------------------------- */
 
 /* Ensure there are enough stack slots for call arguments. */
diff --git a/src/lj_asm_x86.h b/src/lj_asm_x86.h
index 45fc7e85..2ab1dbf5 100644
--- a/src/lj_asm_x86.h
+++ b/src/lj_asm_x86.h
@@ -1218,6 +1218,9 @@ static void asm_fxload(ASMState *as, IRIns *ir)
   emit_mrm(as, xo, dest, RID_MRM);
 }
 
+#define asm_fload(as, ir)       asm_fxload(as, ir)
+#define asm_xload(as, ir)       asm_fxload(as, ir)
+
 static void asm_fxstore(ASMState *as, IRIns *ir)
 {
   RegSet allow = RSET_GPR;
@@ -1281,6 +1284,9 @@ static void asm_fxstore(ASMState *as, IRIns *ir)
   }
 }
 
+#define asm_fstore(as, ir)      asm_fxstore(as, ir)
+#define asm_xstore(as, ir)      asm_fxstore(as, ir)
+
 #if LJ_64
 static Reg asm_load_lightud64(ASMState *as, IRIns *ir, int typecheck)
 {
@@ -1666,6 +1672,9 @@ static void asm_fpmath(ASMState *as, IRIns *ir)
   }
 }
 
+#define asm_atan2(as, ir)       asm_fpmath(as, ir)
+#define asm_ldexp(as, ir)       asm_fpmath(as, ir)
+
 static void asm_fppowi(ASMState *as, IRIns *ir)
 {
   /* The modified regs must match with the *.dasc implementation. */
@@ -1679,6 +1688,17 @@ static void asm_fppowi(ASMState *as, IRIns *ir)
   ra_left(as, RID_EAX, ir->op2);
 }
 
+static void asm_pow(ASMState *as, IRIns *ir)
+{
+#if LJ_64 && LJ_HASFFI
+  if (!irt_isnum(ir->t))
+    asm_callid(as, ir, irt_isi64(ir->t) ? IRCALL_lj_carith_powi64 :
+                                          IRCALL_lj_carith_powu64);
+  else
+#endif
+    asm_fppowi(as, ir);
+}
+
 static int asm_swapops(ASMState *as, IRIns *ir)
 {
   IRIns *irl = IR(ir->op1);
@@ -1855,6 +1875,44 @@ static void asm_add(ASMState *as, IRIns *ir)
     asm_intarith(as, ir, XOg_ADD);
 }
 
+static void asm_sub(ASMState *as, IRIns *ir)
+{
+  if (irt_isnum(ir->t))
+    asm_fparith(as, ir, XO_SUBSD);
+  else  /* Note: no need for LEA trick here. i-k is encoded as i+(-k). */
+    asm_intarith(as, ir, XOg_SUB);
+}
+
+static void asm_mul(ASMState *as, IRIns *ir)
+{
+  if (irt_isnum(ir->t))
+    asm_fparith(as, ir, XO_MULSD);
+  else
+    asm_intarith(as, ir, XOg_X_IMUL);
+}
+
+static void asm_div(ASMState *as, IRIns *ir)
+{
+#if LJ_64 && LJ_HASFFI
+  if (!irt_isnum(ir->t))
+    asm_callid(as, ir, irt_isi64(ir->t) ? IRCALL_lj_carith_divi64 :
+                                          IRCALL_lj_carith_divu64);
+  else
+#endif
+    asm_fparith(as, ir, XO_DIVSD);
+}
+
+static void asm_mod(ASMState *as, IRIns *ir)
+{
+#if LJ_64 && LJ_HASFFI
+  if (!irt_isint(ir->t))
+    asm_callid(as, ir, irt_isi64(ir->t) ? IRCALL_lj_carith_modi64 :
+                                          IRCALL_lj_carith_modu64);
+  else
+#endif
+    asm_callid(as, ir, IRCALL_lj_vm_modi);
+}
+
 static void asm_neg_not(ASMState *as, IRIns *ir, x86Group3 xg)
 {
   Reg dest = ra_dest(as, ir, RSET_GPR);
@@ -1862,7 +1920,17 @@ static void asm_neg_not(ASMState *as, IRIns *ir, x86Group3 xg)
   ra_left(as, dest, ir->op1);
 }
 
-static void asm_min_max(ASMState *as, IRIns *ir, int cc)
+static void asm_neg(ASMState *as, IRIns *ir)
+{
+  if (irt_isnum(ir->t))
+    asm_fparith(as, ir, XO_XORPS);
+  else
+    asm_neg_not(as, ir, XOg_NEG);
+}
+
+#define asm_abs(as, ir)         asm_fparith(as, ir, XO_ANDPS)
+
+static void asm_intmin_max(ASMState *as, IRIns *ir, int cc)
 {
   Reg right, dest = ra_dest(as, ir, RSET_GPR);
   IRRef lref = ir->op1, rref = ir->op2;
@@ -1873,7 +1941,30 @@ static void asm_min_max(ASMState *as, IRIns *ir, int cc)
   ra_left(as, dest, lref);
 }
 
-static void asm_bitswap(ASMState *as, IRIns *ir)
+static void asm_min(ASMState *as, IRIns *ir)
+{
+  if (irt_isnum(ir->t))
+    asm_fparith(as, ir, XO_MINSD);
+  else
+    asm_intmin_max(as, ir, CC_G);
+}
+
+static void asm_max(ASMState *as, IRIns *ir)
+{
+  if (irt_isnum(ir->t))
+    asm_fparith(as, ir, XO_MAXSD);
+  else
+    asm_intmin_max(as, ir, CC_L);
+}
+
+/* Note: don't use LEA for overflow-checking arithmetic! */
+#define asm_addov(as, ir)       asm_intarith(as, ir, XOg_ADD)
+#define asm_subov(as, ir)       asm_intarith(as, ir, XOg_SUB)
+#define asm_mulov(as, ir)       asm_intarith(as, ir, XOg_X_IMUL)
+
+#define asm_bnot(as, ir)        asm_neg_not(as, ir, XOg_NOT)
+
+static void asm_bswap(ASMState *as, IRIns *ir)
 {
   Reg dest = ra_dest(as, ir, RSET_GPR);
   as->mcp = emit_op(XO_BSWAP + ((dest&7) << 24),
@@ -1881,6 +1972,10 @@ static void asm_bitswap(ASMState *as, IRIns *ir)
   ra_left(as, dest, ir->op1);
 }
 
+#define asm_band(as, ir)        asm_intarith(as, ir, XOg_AND)
+#define asm_bor(as, ir)         asm_intarith(as, ir, XOg_OR)
+#define asm_bxor(as, ir)        asm_intarith(as, ir, XOg_XOR)
+
 static void asm_bitshift(ASMState *as, IRIns *ir, x86Shift xs)
 {
   IRRef rref = ir->op2;
@@ -1920,6 +2015,12 @@ static void asm_bitshift(ASMState *as, IRIns *ir, x86Shift xs)
   */
 }
 
+#define asm_bshl(as, ir)        asm_bitshift(as, ir, XOg_SHL)
+#define asm_bshr(as, ir)        asm_bitshift(as, ir, XOg_SHR)
+#define asm_bsar(as, ir)        asm_bitshift(as, ir, XOg_SAR)
+#define asm_brol(as, ir)        asm_bitshift(as, ir, XOg_ROL)
+#define asm_bror(as, ir)        asm_bitshift(as, ir, XOg_ROR)
+
 /* -- Comparisons --------------------------------------------------------- */
 
 /* Virtual flags for unordered FP comparisons. */
@@ -1946,8 +2047,9 @@ static const uint16_t asm_compmap[IR_ABC+1] = {
 };
 
 /* FP and integer comparisons. */
-static void asm_comp(ASMState *as, IRIns *ir, uint32_t cc)
+static void asm_comp(ASMState *as, IRIns *ir)
 {
+  uint32_t cc = asm_compmap[ir->o];
   if (irt_isnum(ir->t)) {
     IRRef lref = ir->op1;
     IRRef rref = ir->op2;
@@ -2102,6 +2204,8 @@ static void asm_comp(ASMState *as, IRIns *ir, uint32_t cc)
   }
 }
 
+#define asm_equal(as, ir)       asm_comp(as, ir)
+
 #if LJ_32 && LJ_HASFFI
 /* 64 bit integer comparisons in 32 bit mode. */
 static void asm_comp_int64(ASMState *as, IRIns *ir)
@@ -2484,175 +2588,6 @@ static void asm_tail_prep(ASMState *as)
   }
 }
 
-/* -- Instruction dispatch ------------------------------------------------ */
-
-/* Assemble a single instruction. */
-static void asm_ir(ASMState *as, IRIns *ir)
-{
-  switch ((IROp)ir->o) {
-  /* Miscellaneous ops. */
-  case IR_LOOP: asm_loop(as); break;
-  case IR_NOP: case IR_XBAR: lua_assert(!ra_used(ir)); break;
-  case IR_USE:
-    ra_alloc1(as, ir->op1, irt_isfp(ir->t) ? RSET_FPR : RSET_GPR); break;
-  case IR_PHI: asm_phi(as, ir); break;
-  case IR_HIOP: asm_hiop(as, ir); break;
-  case IR_GCSTEP: asm_gcstep(as, ir); break;
-
-  /* Guarded assertions. */
-  case IR_EQ: case IR_NE:
-    if ((ir-1)->o == IR_HREF && ir->op1 == as->curins-1) {
-      as->curins--;
-      asm_href(as, ir-1, (IROp)ir->o);
-      break;
-    }
-    /* fallthrough */
-  case IR_LT: case IR_GE: case IR_LE: case IR_GT:
-  case IR_ULT: case IR_UGE: case IR_ULE: case IR_UGT:
-  case IR_ABC:
-    asm_comp(as, ir, asm_compmap[ir->o]);
-    break;
-
-  case IR_RETF: asm_retf(as, ir); break;
-
-  /* Bit ops. */
-  case IR_BNOT: asm_neg_not(as, ir, XOg_NOT); break;
-  case IR_BSWAP: asm_bitswap(as, ir); break;
-
-  case IR_BAND: asm_intarith(as, ir, XOg_AND); break;
-  case IR_BOR:  asm_intarith(as, ir, XOg_OR); break;
-  case IR_BXOR: asm_intarith(as, ir, XOg_XOR); break;
-
-  case IR_BSHL: asm_bitshift(as, ir, XOg_SHL); break;
-  case IR_BSHR: asm_bitshift(as, ir, XOg_SHR); break;
-  case IR_BSAR: asm_bitshift(as, ir, XOg_SAR); break;
-  case IR_BROL: asm_bitshift(as, ir, XOg_ROL); break;
-  case IR_BROR: asm_bitshift(as, ir, XOg_ROR); break;
-
-  /* Arithmetic ops. */
-  case IR_ADD: asm_add(as, ir); break;
-  case IR_SUB:
-    if (irt_isnum(ir->t))
-      asm_fparith(as, ir, XO_SUBSD);
-    else  /* Note: no need for LEA trick here. i-k is encoded as i+(-k). */
-      asm_intarith(as, ir, XOg_SUB);
-    break;
-  case IR_MUL:
-    if (irt_isnum(ir->t))
-      asm_fparith(as, ir, XO_MULSD);
-    else
-      asm_intarith(as, ir, XOg_X_IMUL);
-    break;
-  case IR_DIV:
-#if LJ_64 && LJ_HASFFI
-    if (!irt_isnum(ir->t))
-      asm_callid(as, ir, irt_isi64(ir->t) ? IRCALL_lj_carith_divi64 :
-                                            IRCALL_lj_carith_divu64);
-    else
-#endif
-      asm_fparith(as, ir, XO_DIVSD);
-    break;
-  case IR_MOD:
-#if LJ_64 && LJ_HASFFI
-    if (!irt_isint(ir->t))
-      asm_callid(as, ir, irt_isi64(ir->t) ? IRCALL_lj_carith_modi64 :
-                                            IRCALL_lj_carith_modu64);
-    else
-#endif
-      asm_callid(as, ir, IRCALL_lj_vm_modi);
-    break;
-
-  case IR_NEG:
-    if (irt_isnum(ir->t))
-      asm_fparith(as, ir, XO_XORPS);
-    else
-      asm_neg_not(as, ir, XOg_NEG);
-    break;
-  case IR_ABS: asm_fparith(as, ir, XO_ANDPS); break;
-
-  case IR_MIN:
-    if (irt_isnum(ir->t))
-      asm_fparith(as, ir, XO_MINSD);
-    else
-      asm_min_max(as, ir, CC_G);
-    break;
-  case IR_MAX:
-    if (irt_isnum(ir->t))
-      asm_fparith(as, ir, XO_MAXSD);
-    else
-      asm_min_max(as, ir, CC_L);
-    break;
-
-  case IR_FPMATH: case IR_ATAN2: case IR_LDEXP:
-    asm_fpmath(as, ir);
-    break;
-  case IR_POW:
-#if LJ_64 && LJ_HASFFI
-    if (!irt_isnum(ir->t))
-      asm_callid(as, ir, irt_isi64(ir->t) ? IRCALL_lj_carith_powi64 :
-                                            IRCALL_lj_carith_powu64);
-    else
-#endif
-      asm_fppowi(as, ir);
-    break;
-
-  /* Overflow-checking arithmetic ops. Note: don't use LEA here! */
-  case IR_ADDOV: asm_intarith(as, ir, XOg_ADD); break;
-  case IR_SUBOV: asm_intarith(as, ir, XOg_SUB); break;
-  case IR_MULOV: asm_intarith(as, ir, XOg_X_IMUL); break;
-
-  /* Memory references. */
-  case IR_AREF: asm_aref(as, ir); break;
-  case IR_HREF: asm_href(as, ir, 0); break;
-  case IR_HREFK: asm_hrefk(as, ir); break;
-  case IR_NEWREF: asm_newref(as, ir); break;
-  case IR_UREFO: case IR_UREFC: asm_uref(as, ir); break;
-  case IR_FREF: asm_fref(as, ir); break;
-  case IR_STRREF: asm_strref(as, ir); break;
-
-  /* Loads and stores. */
-  case IR_ALOAD: case IR_HLOAD: case IR_ULOAD: case IR_VLOAD:
-    asm_ahuvload(as, ir);
-    break;
-  case IR_FLOAD: case IR_XLOAD: asm_fxload(as, ir); break;
-  case IR_SLOAD: asm_sload(as, ir); break;
-
-  case IR_ASTORE: case IR_HSTORE: case IR_USTORE: asm_ahustore(as, ir); break;
-  case IR_FSTORE: case IR_XSTORE: asm_fxstore(as, ir); break;
-
-  /* Allocations. */
-  case IR_SNEW: case IR_XSNEW: asm_snew(as, ir); break;
-  case IR_TNEW: asm_tnew(as, ir); break;
-  case IR_TDUP: asm_tdup(as, ir); break;
-  case IR_CNEW: case IR_CNEWI: asm_cnew(as, ir); break;
-
-  /* Buffer operations. */
-  case IR_BUFHDR: asm_bufhdr(as, ir); break;
-  case IR_BUFPUT: asm_bufput(as, ir); break;
-  case IR_BUFSTR: asm_bufstr(as, ir); break;
-
-  /* Write barriers. */
-  case IR_TBAR: asm_tbar(as, ir); break;
-  case IR_OBAR: asm_obar(as, ir); break;
-
-  /* Type conversions. */
-  case IR_TOBIT: asm_tobit(as, ir); break;
-  case IR_CONV: asm_conv(as, ir); break;
-  case IR_TOSTR: asm_tostr(as, ir); break;
-  case IR_STRTO: asm_strto(as, ir); break;
-
-  /* Calls. */
-  case IR_CALLN: case IR_CALLL: case IR_CALLS: asm_call(as, ir); break;
-  case IR_CALLXS: asm_callx(as, ir); break;
-  case IR_CARG: break;
-
-  default:
-    setintV(&as->J->errinfo, ir->o);
-    lj_trace_err_info(as->J, LJ_TRERR_NYIIR);
-    break;
-  }
-}
-
 /* -- Trace setup --------------------------------------------------------- */
 
 /* Ensure there are enough stack slots for call arguments. */