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Optimize bitwise shift and rotate operations for constant right-hand side values

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This commit is contained in:
ownedbywuigi 2026-03-27 19:03:45 +00:00
commit b87795b656
1 changed files with 61 additions and 7 deletions
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68
js/src/wasm/WasmBaselineCompile.cpp
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@ -4280,12 +4280,18 @@ BaseCompiler::emitShlI32()
void
BaseCompiler::emitShlI64()
{
// TODO / OPTIMIZE: Constant rhs (Bug 1316803)
int32_t c;
if (popConstI32(c)) {
RegI64 r = popI64();
masm.lshift64(Imm32(c & 63), r.reg);
pushI64(r);
} else {
RegI64 r0, r1;
pop2xI64ForShiftOrRotate(&r0, &r1);
masm.lshift64(lowPart(r1), r0.reg);
freeI64(r1);
pushI64(r0);
}
}
void
@ -4309,12 +4315,18 @@ BaseCompiler::emitShrI32()
void
BaseCompiler::emitShrI64()
{
// TODO / OPTIMIZE: Constant rhs (Bug 1316803)
int32_t c;
if (popConstI32(c)) {
RegI64 r = popI64();
masm.rshift64Arithmetic(Imm32(c & 63), r.reg);
pushI64(r);
} else {
RegI64 r0, r1;
pop2xI64ForShiftOrRotate(&r0, &r1);
masm.rshift64Arithmetic(lowPart(r1), r0.reg);
freeI64(r1);
pushI64(r0);
}
}
void
@ -4338,56 +4350,98 @@ BaseCompiler::emitShrU32()
void
BaseCompiler::emitShrU64()
{
// TODO / OPTIMIZE: Constant rhs (Bug 1316803)
int32_t c;
if (popConstI32(c)) {
RegI64 r = popI64();
masm.rshift64(Imm32(c & 63), r.reg);
pushI64(r);
} else {
RegI64 r0, r1;
pop2xI64ForShiftOrRotate(&r0, &r1);
masm.rshift64(lowPart(r1), r0.reg);
freeI64(r1);
pushI64(r0);
}
}
void
BaseCompiler::emitRotrI32()
{
// TODO / OPTIMIZE: Constant rhs (Bug 1316803)
int32_t c;
if (popConstI32(c)) {
RegI32 r = popI32();
masm.rotateRight(Imm32(c & 31), r.reg, r.reg);
pushI32(r);
} else {
RegI32 r0, r1;
pop2xI32ForShiftOrRotate(&r0, &r1);
masm.rotateRight(r1.reg, r0.reg, r0.reg);
freeI32(r1);
pushI32(r0);
}
}
void
BaseCompiler::emitRotrI64()
{
// TODO / OPTIMIZE: Constant rhs (Bug 1316803)
int32_t c;
if (popConstI32(c)) {
RegI64 r = popI64();
#ifdef JS_PUNBOX64
masm.rotateRight64(Imm32(c & 63), r.reg, r.reg);
#else
RegI32 temp = needI32();
masm.rotateRight64(Imm32(c & 63), r.reg, r.reg, temp.reg);
freeI32(temp);
#endif
pushI64(r);
} else {
RegI64 r0, r1;
pop2xI64ForShiftOrRotate(&r0, &r1);
masm.rotateRight64(lowPart(r1), r0.reg, r0.reg, maybeHighPart(r1));
freeI64(r1);
pushI64(r0);
}
}
void
BaseCompiler::emitRotlI32()
{
// TODO / OPTIMIZE: Constant rhs (Bug 1316803)
int32_t c;
if (popConstI32(c)) {
RegI32 r = popI32();
masm.rotateLeft(Imm32(c & 31), r.reg, r.reg);
pushI32(r);
} else {
RegI32 r0, r1;
pop2xI32ForShiftOrRotate(&r0, &r1);
masm.rotateLeft(r1.reg, r0.reg, r0.reg);
freeI32(r1);
pushI32(r0);
}
}
void
BaseCompiler::emitRotlI64()
{
// TODO / OPTIMIZE: Constant rhs (Bug 1316803)
int32_t c;
if (popConstI32(c)) {
RegI64 r = popI64();
#ifdef JS_PUNBOX64
masm.rotateLeft64(Imm32(c & 63), r.reg, r.reg);
#else
RegI32 temp = needI32();
masm.rotateLeft64(Imm32(c & 63), r.reg, r.reg, temp.reg);
freeI32(temp);
#endif
pushI64(r);
} else {
RegI64 r0, r1;
pop2xI64ForShiftOrRotate(&r0, &r1);
masm.rotateLeft64(lowPart(r1), r0.reg, r0.reg, maybeHighPart(r1));
freeI64(r1);
pushI64(r0);
}
}
void