Revision: 21988
Author: [email protected]
Date: Tue Jun 24 16:53:25 2014 UTC
Log: MIPS: optimize Lithium Allocate.
Port r21968 (f6c757c)
http://code.google.com/p/v8/source/detail?r=21988
Modified:
/branches/bleeding_edge/src/mips/lithium-codegen-mips.cc
/branches/bleeding_edge/src/mips/lithium-mips.cc
=======================================
--- /branches/bleeding_edge/src/mips/lithium-codegen-mips.cc Fri Jun 20
08:40:11 2014 UTC
+++ /branches/bleeding_edge/src/mips/lithium-codegen-mips.cc Tue Jun 24
16:53:25 2014 UTC
@@ -5291,33 +5291,26 @@
}
} else {
Register size = ToRegister(instr->size());
- __ Allocate(size,
- result,
- scratch,
- scratch2,
- deferred->entry(),
- flags);
+ __ Allocate(size, result, scratch, scratch2, deferred->entry(), flags);
}
__ bind(deferred->exit());
if (instr->hydrogen()->MustPrefillWithFiller()) {
+ STATIC_ASSERT(kHeapObjectTag == 1);
if (instr->size()->IsConstantOperand()) {
int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
- __ li(scratch, Operand(size));
+ __ li(scratch, Operand(size - kHeapObjectTag));
} else {
- scratch = ToRegister(instr->size());
+ __ Subu(scratch, ToRegister(instr->size()), Operand(kHeapObjectTag));
}
- __ Subu(scratch, scratch, Operand(kPointerSize));
- __ Subu(result, result, Operand(kHeapObjectTag));
+ __ li(scratch2,
Operand(isolate()->factory()->one_pointer_filler_map()));
Label loop;
__ bind(&loop);
- __ li(scratch2,
Operand(isolate()->factory()->one_pointer_filler_map()));
+ __ Subu(scratch, scratch, Operand(kPointerSize));
__ Addu(at, result, Operand(scratch));
__ sw(scratch2, MemOperand(at));
- __ Subu(scratch, scratch, Operand(kPointerSize));
__ Branch(&loop, ge, scratch, Operand(zero_reg));
- __ Addu(result, result, Operand(kHeapObjectTag));
}
}
=======================================
--- /branches/bleeding_edge/src/mips/lithium-mips.cc Fri Jun 20 11:26:17
2014 UTC
+++ /branches/bleeding_edge/src/mips/lithium-mips.cc Tue Jun 24 16:53:25
2014 UTC
@@ -2315,9 +2315,7 @@
LInstruction* LChunkBuilder::DoAllocate(HAllocate* instr) {
info()->MarkAsDeferredCalling();
LOperand* context = UseAny(instr->context());
- LOperand* size = instr->size()->IsConstant()
- ? UseConstant(instr->size())
- : UseTempRegister(instr->size());
+ LOperand* size = UseRegisterOrConstant(instr->size());
LOperand* temp1 = TempRegister();
LOperand* temp2 = TempRegister();
LAllocate* result = new(zone()) LAllocate(context, size, temp1, temp2);
--
--
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