Add randomized register allocation for fuzz testing.

This must be explicitly enabled with: -DLUAJIT_RANDOM_RA
Thanks to Peter Cawley. #1062

1 files changed, 6 insertions, 4 deletions

diff --git a/src/lj_target.h b/src/lj_target.h
index 2f4d21c1..09d19bd9 100644
--- a/src/lj_target.h
+++ b/src/lj_target.h
@@ -57,8 +57,10 @@ typedef uint32_t RegSP;
 */
 #if LJ_TARGET_PPC || LJ_TARGET_MIPS || LJ_TARGET_ARM64
 typedef uint64_t RegSet;
+#define RSET_BITS               6
 #else
 typedef uint32_t RegSet;
+#define RSET_BITS               5
 #endif
 
 #define RID2RSET(r)             (((RegSet)1) << (r))
@@ -70,11 +72,11 @@ typedef uint32_t RegSet;
 #define rset_clear(rs, r)       (rs &= ~RID2RSET(r))
 #define rset_exclude(rs, r)     (rs & ~RID2RSET(r))
 #if LJ_TARGET_PPC || LJ_TARGET_MIPS || LJ_TARGET_ARM64
-#define rset_picktop(rs)        ((Reg)(__builtin_clzll(rs)^63))
-#define rset_pickbot(rs)        ((Reg)__builtin_ctzll(rs))
+#define rset_picktop_(rs)       ((Reg)(__builtin_clzll(rs)^63))
+#define rset_pickbot_(rs)       ((Reg)__builtin_ctzll(rs))
 #else
-#define rset_picktop(rs)        ((Reg)lj_fls(rs))
-#define rset_pickbot(rs)        ((Reg)lj_ffs(rs))
+#define rset_picktop_(rs)       ((Reg)lj_fls(rs))
+#define rset_pickbot_(rs)       ((Reg)lj_ffs(rs))
 #endif
 
 /* -- Register allocation cost -------------------------------------------- */