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Add randomized register allocation for fuzz testing.

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This must be explicitly enabled with: -DLUAJIT_RANDOM_RA
Thanks to Peter Cawley. #1062
This commit is contained in:
Mike Pall
2023-08-30 01:10:52 +02:00
parent 2f6c451ce8
commit 41fb94defa
4 changed files with 58 additions and 7 deletions
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10
src/lj_target.h
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@@ -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 -------------------------------------------- */