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Fuse XLOAD/XSTORE operands more aggressively.

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Mike Pall 2011-04-05 16:32:27 +02:00
parent 3acd4892e9
commit 66a1006175
1 changed files with 4 additions and 3 deletions
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7
src/lj_asm.c
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@ -97,6 +97,7 @@ typedef struct ASMState {
#define FUSE_DISABLED (~(IRRef)0) #define FUSE_DISABLED (~(IRRef)0)
#define mayfuse(as, ref) ((ref) > as->fuseref) #define mayfuse(as, ref) ((ref) > as->fuseref)
#define neverfuse(as) (as->fuseref == FUSE_DISABLED) #define neverfuse(as) (as->fuseref == FUSE_DISABLED)
#define canfuse(as, ir) (!neverfuse(as) && !irt_isphi((ir)->t))
#define opisfusableload(o) \ #define opisfusableload(o) \
((o) == IR_ALOAD || (o) == IR_HLOAD || (o) == IR_ULOAD || \ ((o) == IR_ALOAD || (o) == IR_HLOAD || (o) == IR_ULOAD || \
(o) == IR_FLOAD || (o) == IR_XLOAD || (o) == IR_SLOAD || (o) == IR_VLOAD) (o) == IR_FLOAD || (o) == IR_XLOAD || (o) == IR_SLOAD || (o) == IR_VLOAD)
@ -1348,7 +1349,7 @@ static void asm_fusexref(ASMState *as, IRRef ref, RegSet allow)
asm_fusestrref(as, ir, allow); asm_fusestrref(as, ir, allow);
} else { } else {
as->mrm.ofs = 0; as->mrm.ofs = 0;
if (mayfuse(as, ref) && ir->o == IR_ADD && ra_noreg(ir->r)) { if (canfuse(as, ir) && ir->o == IR_ADD && ra_noreg(ir->r)) {
/* Gather (base+idx*sz)+ofs as emitted by cdata ptr/array indexing. */ /* Gather (base+idx*sz)+ofs as emitted by cdata ptr/array indexing. */
IRIns *irx; IRIns *irx;
IRRef idx; IRRef idx;
@ -1356,7 +1357,7 @@ static void asm_fusexref(ASMState *as, IRRef ref, RegSet allow)
if (asm_isk32(as, ir->op2, &as->mrm.ofs)) { /* Recognize x+ofs. */ if (asm_isk32(as, ir->op2, &as->mrm.ofs)) { /* Recognize x+ofs. */
ref = ir->op1; ref = ir->op1;
ir = IR(ref); ir = IR(ref);
if (!(ir->o == IR_ADD && mayfuse(as, ref) && ra_noreg(ir->r))) if (!(ir->o == IR_ADD && canfuse(as, ir) && ra_noreg(ir->r)))
goto noadd; goto noadd;
} }
as->mrm.scale = XM_SCALE1; as->mrm.scale = XM_SCALE1;
@ -1368,7 +1369,7 @@ static void asm_fusexref(ASMState *as, IRRef ref, RegSet allow)
ref = ir->op1; ref = ir->op1;
irx = IR(idx); irx = IR(idx);
} }
if (mayfuse(as, idx) && ra_noreg(irx->r)) { if (canfuse(as, irx) && ra_noreg(irx->r)) {
if (irx->o == IR_BSHL && irref_isk(irx->op2) && IR(irx->op2)->i <= 3) { if (irx->o == IR_BSHL && irref_isk(irx->op2) && IR(irx->op2)->i <= 3) {
/* Recognize idx<<b with b = 0-3, corresponding to sz = (1),2,4,8. */ /* Recognize idx<<b with b = 0-3, corresponding to sz = (1),2,4,8. */
idx = irx->op1; idx = irx->op1;