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Unified Diff: src/arm/lithium-arm.cc

Issue 308593003: Simplify known successor block lowering. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 7 months ago
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Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 1525565f190c084eee9a23760bbaadca76b71183..ac192f6731218d10f99915092ad7d528666e2ba0 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -841,7 +841,14 @@ 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();
@@ -927,9 +934,6 @@ 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();
@@ -954,9 +958,6 @@ LInstruction* LChunkBuilder::DoDebugBreak(HDebugBreak* 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();
@@ -1682,8 +1683,6 @@ 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));
@@ -1704,8 +1703,6 @@ 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);
@@ -1721,8 +1718,6 @@ 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);
@@ -2495,9 +2490,6 @@ 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(UseRegister(instr->value()));
}
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