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x86: Generate BMI2 shifts and rotates, if available.

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Contributed by Peter Cawley.
This commit is contained in:
Mike Pall
2016-03-28 23:05:20 +02:00
parent 6801e7165c
commit 892887e584
5 changed files with 51 additions and 7 deletions
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11
src/lj_target_x86.h
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@@ -189,6 +189,11 @@ typedef struct {
#define XO_f20f(o) ((uint32_t)(0x0ff2fc + (0x##o<<24)))
#define XO_f30f(o) ((uint32_t)(0x0ff3fc + (0x##o<<24)))
#define XV_660f38(o) ((uint32_t)(0x79e2c4 + (0x##o<<24)))
#define XV_f20f38(o) ((uint32_t)(0x7be2c4 + (0x##o<<24)))
#define XV_f20f3a(o) ((uint32_t)(0x7be3c4 + (0x##o<<24)))
#define XV_f30f38(o) ((uint32_t)(0x7ae2c4 + (0x##o<<24)))
/* This list of x86 opcodes is not intended to be complete. Opcodes are only
** included when needed. Take a look at DynASM or jit.dis_x86 to see the
** whole mess.
@@ -231,6 +236,12 @@ typedef enum {
XI_FSCALE = 0xfdd9,
XI_FYL2X = 0xf1d9,
/* VEX-encoded instructions. XV_* prefix. */
XV_RORX = XV_f20f3a(f0),
XV_SARX = XV_f30f38(f7),
XV_SHLX = XV_660f38(f7),
XV_SHRX = XV_f20f38(f7),
/* Variable-length opcodes. XO_* prefix. */
XO_MOV = XO_(8b),
XO_MOVto = XO_(89),