Windows/ARM64: Add initial support.

Only builds with native ARM64 Visual Studio for now.
Thanks to vanc and Stephen Just. #593 #964

1 files changed, 4 insertions, 7 deletions

diff --git a/src/lj_target.h b/src/lj_target.h
index 09d19bd9..e7322c07 100644
--- a/src/lj_target.h
+++ b/src/lj_target.h
@@ -58,9 +58,13 @@ typedef uint32_t RegSP;
 #if LJ_TARGET_PPC || LJ_TARGET_MIPS || LJ_TARGET_ARM64
 typedef uint64_t RegSet;
 #define RSET_BITS               6
+#define rset_picktop_(rs)       ((Reg)lj_fls64(rs))
+#define rset_pickbot_(rs)       ((Reg)lj_ffs64(rs))
 #else
 typedef uint32_t RegSet;
 #define RSET_BITS               5
+#define rset_picktop_(rs)       ((Reg)lj_fls(rs))
+#define rset_pickbot_(rs)       ((Reg)lj_ffs(rs))
 #endif
 
 #define RID2RSET(r)             (((RegSet)1) << (r))
@@ -71,13 +75,6 @@ typedef uint32_t RegSet;
 #define rset_set(rs, r)         (rs |= RID2RSET(r))
 #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))
-#else
-#define rset_picktop_(rs)       ((Reg)lj_fls(rs))
-#define rset_pickbot_(rs)       ((Reg)lj_ffs(rs))
-#endif
 
 /* -- Register allocation cost -------------------------------------------- */