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A64: Improve constraints on StoreKeyed instructions

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BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/190783002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19730 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
m.m.capewell@googlemail.com 2014-03-07 17:12:47 +00:00
parent 737584cca1
commit b2041607a3
2 changed files with 19 additions and 16 deletions
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13
src/a64/lithium-a64.cc
View File

@ -2124,7 +2124,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
LOperand* temp = NULL;
LOperand* elements = NULL;
LOperand* val = NULL;
LOperand* key = NULL;
LOperand* key = UseRegisterOrConstantAtStart(instr->key());
if (!instr->is_typed_elements() &&
instr->value()->representation().IsTagged() &&
@ -2132,11 +2132,11 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
// RecordWrite() will clobber all registers.
elements = UseRegisterAndClobber(instr->elements());
val = UseRegisterAndClobber(instr->value());
key = UseRegisterAndClobber(instr->key());
temp = TempRegister();
} else {
elements = UseRegister(instr->elements());
val = UseRegister(instr->value());
key = UseRegisterOrConstantAtStart(instr->key());
temp = instr->key()->IsConstant() ? NULL : TempRegister();
}
if (instr->is_typed_elements()) {
@ -2148,23 +2148,16 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
instr->elements()->representation().IsTagged()) ||
(instr->is_external() &&
instr->elements()->representation().IsExternal()));
temp = instr->key()->IsConstant() ? NULL : TempRegister();
return new(zone()) LStoreKeyedExternal(elements, key, val, temp);
} else if (instr->value()->representation().IsDouble()) {
ASSERT(instr->elements()->representation().IsTagged());
// The constraint used here is UseRegister, even though the StoreKeyed
// instruction may canonicalize the value in the register if it is a NaN.
temp = TempRegister();
return new(zone()) LStoreKeyedFixedDouble(elements, key, val, temp);
} else {
ASSERT(instr->elements()->representation().IsTagged());
ASSERT(instr->value()->representation().IsSmiOrTagged() ||
instr->value()->representation().IsInteger32());
temp = TempRegister();
return new(zone()) LStoreKeyedFixed(elements, key, val, temp);
}
}

22
src/a64/lithium-codegen-a64.cc
View File

@ -4989,7 +4989,7 @@ void LCodeGen::DoStoreKeyedExternal(LStoreKeyedExternal* instr) {
void LCodeGen::DoStoreKeyedFixedDouble(LStoreKeyedFixedDouble* instr) {
Register elements = ToRegister(instr->elements());
DoubleRegister value = ToDoubleRegister(instr->value());
Register store_base = ToRegister(instr->temp());
Register store_base = no_reg;
int offset = 0;
if (instr->key()->IsConstantOperand()) {
@ -5001,6 +5001,7 @@ void LCodeGen::DoStoreKeyedFixedDouble(LStoreKeyedFixedDouble* instr) {
instr->additional_index());
store_base = elements;
} else {
store_base = ToRegister(instr->temp());
Register key = ToRegister(instr->key());
bool key_is_tagged = instr->hydrogen()->key()->representation().IsSmi();
CalcKeyedArrayBaseRegister(store_base, elements, key, key_is_tagged,
@ -5023,17 +5024,23 @@ void LCodeGen::DoStoreKeyedFixedDouble(LStoreKeyedFixedDouble* instr) {
void LCodeGen::DoStoreKeyedFixed(LStoreKeyedFixed* instr) {
Register value = ToRegister(instr->value());
Register elements = ToRegister(instr->elements());
Register store_base = ToRegister(instr->temp());
Register scratch = no_reg;
Register store_base = no_reg;
Register key = no_reg;
int offset = 0;
if (!instr->key()->IsConstantOperand() ||
instr->hydrogen()->NeedsWriteBarrier()) {
scratch = ToRegister(instr->temp());
}
if (instr->key()->IsConstantOperand()) {
ASSERT(!instr->hydrogen()->NeedsWriteBarrier());
LConstantOperand* const_operand = LConstantOperand::cast(instr->key());
offset = FixedArray::OffsetOfElementAt(ToInteger32(const_operand) +
instr->additional_index());
store_base = elements;
} else {
store_base = scratch;
key = ToRegister(instr->key());
bool key_is_tagged = instr->hydrogen()->key()->representation().IsSmi();
CalcKeyedArrayBaseRegister(store_base, elements, key, key_is_tagged,
@ -5052,13 +5059,16 @@ void LCodeGen::DoStoreKeyedFixed(LStoreKeyedFixed* instr) {
}
if (instr->hydrogen()->NeedsWriteBarrier()) {
ASSERT(representation.IsTagged());
// This assignment may cause element_addr to alias store_base.
Register element_addr = scratch;
SmiCheck check_needed =
instr->hydrogen()->value()->IsHeapObject()
? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
// Compute address of modified element and store it into key register.
__ Add(key, store_base, offset - kHeapObjectTag);
__ RecordWrite(elements, key, value, GetLinkRegisterState(), kSaveFPRegs,
EMIT_REMEMBERED_SET, check_needed);
__ Add(element_addr, store_base, offset - kHeapObjectTag);
__ RecordWrite(elements, element_addr, value, GetLinkRegisterState(),
kSaveFPRegs, EMIT_REMEMBERED_SET, check_needed);
}
}