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PPC: Fuse BSWAP with XLOAD/XSTORE to lwbrx/stwbrx.

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This commit is contained in:
Mike Pall 2011-10-25 19:50:44 +02:00
parent ca2b923026
commit 179fe9e5d8
2 changed files with 45 additions and 13 deletions
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55
src/lj_asm_ppc.h
View File

@ -205,6 +205,22 @@ static void asm_fusexref(ASMState *as, PPCIns pi, Reg rt, IRRef ref,
emit_fai(as, pi, rt, base, ofs);
}
/* Fuse XLOAD/XSTORE reference into indexed-only load/store operand. */
static void asm_fusexrefx(ASMState *as, PPCIns pi, Reg rt, IRRef ref,
RegSet allow)
{
IRIns *ira = IR(ref);
Reg right, left;
if (mayfuse(as, ref) && ira->o == IR_ADD && ra_noreg(ira->r)) {
left = ra_alloc2(as, ira, allow);
right = (left >> 8); left &= 255;
} else {
right = ra_alloc1(as, ref, allow);
left = RID_R0;
}
emit_tab(as, pi, rt, left, right);
}
/* Fuse to multiply-add/sub instruction. */
static int asm_fusemadd(ASMState *as, IRIns *ir, PPCIns pi, PPCIns pir)
{
@ -886,10 +902,17 @@ static void asm_xload(ASMState *as, IRIns *ir)
static void asm_xstore(ASMState *as, IRIns *ir)
{
// NYI: fuse with bswap to stwbrx.
Reg src = ra_alloc1(as, ir->op2, irt_isfp(ir->t) ? RSET_FPR : RSET_GPR);
asm_fusexref(as, asm_fxstoreins(ir), src, ir->op1,
rset_exclude(RSET_GPR, src));
IRIns *irb;
if (mayfuse(as, ir->op2) && (irb = IR(ir->op2))->o == IR_BSWAP &&
ra_noreg(irb->r) && (irt_isint(ir->t) || irt_isu32(ir->t))) {
/* Fuse BSWAP with XSTORE to stwbrx. */
Reg src = ra_alloc1(as, irb->op1, RSET_GPR);
asm_fusexrefx(as, PPCI_STWBRX, src, ir->op1, rset_exclude(RSET_GPR, src));
} else {
Reg src = ra_alloc1(as, ir->op2, irt_isfp(ir->t) ? RSET_FPR : RSET_GPR);
asm_fusexref(as, asm_fxstoreins(ir), src, ir->op1,
rset_exclude(RSET_GPR, src));
}
}
static void asm_ahuvload(ASMState *as, IRIns *ir)
@ -1410,17 +1433,23 @@ nofuse:
static void asm_bitswap(ASMState *as, IRIns *ir)
{
// NYI: fuse with XLOAD to lwbrx.
Reg dest = ra_dest(as, ir, RSET_GPR);
Reg left = ra_alloc1(as, ir->op1, RSET_GPR);
Reg tmp = dest;
if (tmp == left) {
tmp = RID_TMP;
emit_mr(as, dest, RID_TMP);
IRIns *irx;
if (mayfuse(as, ir->op1) && (irx = IR(ir->op1))->o == IR_XLOAD &&
ra_noreg(irx->r) && (irt_isint(irx->t) || irt_isu32(irx->t))) {
/* Fuse BSWAP with XLOAD to lwbrx. */
asm_fusexrefx(as, PPCI_LWBRX, dest, irx->op1, RSET_GPR);
} else {
Reg left = ra_alloc1(as, ir->op1, RSET_GPR);
Reg tmp = dest;
if (tmp == left) {
tmp = RID_TMP;
emit_mr(as, dest, RID_TMP);
}
emit_rot(as, PPCI_RLWIMI, tmp, left, 24, 16, 23);
emit_rot(as, PPCI_RLWIMI, tmp, left, 24, 0, 7);
emit_rotlwi(as, tmp, left, 8);
}
emit_rot(as, PPCI_RLWIMI, tmp, left, 24, 16, 23);
emit_rot(as, PPCI_RLWIMI, tmp, left, 24, 0, 7);
emit_rotlwi(as, tmp, left, 8);
}
static void asm_bitop(ASMState *as, IRIns *ir, PPCIns pi, PPCIns pik)

3
src/lj_target_ppc.h
View File

@ -240,6 +240,9 @@ typedef enum PPCIns {
PPCI_LHAX = 0x7c0002ae,
PPCI_STHX = 0x7c00032e,
PPCI_LWBRX = 0x7c00042c,
PPCI_STWBRX = 0x7c00052c,
PPCI_LFSX = 0x7c00042e,
PPCI_LFDX = 0x7c0004ae,
PPCI_STFSX = 0x7c00052e,