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Disable FMA by default. Use -Ofma or jit.opt.start("+fma") to enable.

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See the discussion in #918 for the rationale.
This commit is contained in:
Mike Pall
2022-12-07 18:38:22 +01:00
parent 7d5d4a1b1a
commit de2e1ca9d3
7 changed files with 35 additions and 6 deletions
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4
src/lj_jit.h
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@@ -87,10 +87,11 @@
#define JIT_F_OPT_ABC (JIT_F_OPT << 7)
#define JIT_F_OPT_SINK (JIT_F_OPT << 8)
#define JIT_F_OPT_FUSE (JIT_F_OPT << 9)
#define JIT_F_OPT_FMA (JIT_F_OPT << 10)
/* Optimizations names for -O. Must match the order above. */
#define JIT_F_OPTSTRING \
"\4fold\3cse\3dce\3fwd\3dse\6narrow\4loop\3abc\4sink\4fuse"
"\4fold\3cse\3dce\3fwd\3dse\6narrow\4loop\3abc\4sink\4fuse\3fma"
/* Optimization levels set a fixed combination of flags. */
#define JIT_F_OPT_0 0
@@ -99,6 +100,7 @@
#define JIT_F_OPT_3 (JIT_F_OPT_2|\
JIT_F_OPT_FWD|JIT_F_OPT_DSE|JIT_F_OPT_ABC|JIT_F_OPT_SINK|JIT_F_OPT_FUSE)
#define JIT_F_OPT_DEFAULT JIT_F_OPT_3
/* Note: FMA is not set by default. */
/* -- JIT engine parameters ----------------------------------------------- */