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MIPS: Simplify known successor block lowering.

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Port r21589 (a9f3228)

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/306053011

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21610 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
plind44@gmail.com 2014-06-02 13:40:39 +00:00
parent d6500b6cf7
commit e4215c6a54
2 changed files with 8 additions and 18 deletions
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24
src/mips/lithium-mips.cc
View File

@ -849,7 +849,14 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
chunk_->AddInstruction(dummy, current_block_);
}
} else {
instr = current->CompileToLithium(this);
HBasicBlock* successor;
if (current->IsControlInstruction() &&
HControlInstruction::cast(current)->KnownSuccessorBlock(&successor) &&
successor != NULL) {
instr = new(zone()) LGoto(successor);
} else {
instr = current->CompileToLithium(this);
}
}
argument_count_ += current->argument_delta();
@ -935,9 +942,6 @@ LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
LInstruction* goto_instr = CheckElideControlInstruction(instr);
if (goto_instr != NULL) return goto_instr;
HValue* value = instr->value();
Representation r = value->representation();
HType type = value->type();
@ -957,9 +961,6 @@ LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
LInstruction* goto_instr = CheckElideControlInstruction(instr);
if (goto_instr != NULL) return goto_instr;
ASSERT(instr->value()->representation().IsTagged());
LOperand* value = UseRegisterAtStart(instr->value());
LOperand* temp = TempRegister();
@ -1628,8 +1629,6 @@ LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
LInstruction* LChunkBuilder::DoCompareNumericAndBranch(
HCompareNumericAndBranch* instr) {
LInstruction* goto_instr = CheckElideControlInstruction(instr);
if (goto_instr != NULL) return goto_instr;
Representation r = instr->representation();
if (r.IsSmiOrInteger32()) {
ASSERT(instr->left()->representation().Equals(r));
@ -1650,8 +1649,6 @@ LInstruction* LChunkBuilder::DoCompareNumericAndBranch(
LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
HCompareObjectEqAndBranch* instr) {
LInstruction* goto_instr = CheckElideControlInstruction(instr);
if (goto_instr != NULL) return goto_instr;
LOperand* left = UseRegisterAtStart(instr->left());
LOperand* right = UseRegisterAtStart(instr->right());
return new(zone()) LCmpObjectEqAndBranch(left, right);
@ -1667,8 +1664,6 @@ LInstruction* LChunkBuilder::DoCompareHoleAndBranch(
LInstruction* LChunkBuilder::DoCompareMinusZeroAndBranch(
HCompareMinusZeroAndBranch* instr) {
LInstruction* goto_instr = CheckElideControlInstruction(instr);
if (goto_instr != NULL) return goto_instr;
LOperand* value = UseRegister(instr->value());
LOperand* scratch = TempRegister();
return new(zone()) LCompareMinusZeroAndBranch(value, scratch);
@ -2433,9 +2428,6 @@ LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
LInstruction* LChunkBuilder::DoTypeofIsAndBranch(HTypeofIsAndBranch* instr) {
LInstruction* goto_instr = CheckElideControlInstruction(instr);
if (goto_instr != NULL) return goto_instr;
return new(zone()) LTypeofIsAndBranch(UseTempRegister(instr->value()));
}

2
src/mips/lithium-mips.h
View File

@ -2655,8 +2655,6 @@ class LChunkBuilder V8_FINAL : public LChunkBuilderBase {
// Build the sequence for the graph.
LPlatformChunk* Build();
LInstruction* CheckElideControlInstruction(HControlInstruction* instr);
// Declare methods that deal with the individual node types.
#define DECLARE_DO(type) LInstruction* Do##type(H##type* node);
HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)