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X87: Try avoiding MISS for callic monomorphic case.

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port 6412c8ba70f2331aae0f21b968dd051b2320b947 (r25207)

original commit message:

  Try avoiding MISS for callic monomorphic case.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/713743003

Patch from Chunyang Dai <chunyang.dai@intel.com>.

Cr-Commit-Position: refs/heads/master@{#25230}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25230 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
weiliang.lin@intel.com 2014-11-10 05:50:51 +00:00
parent c53fa96773
commit 50a829b3cf
1 changed files with 56 additions and 21 deletions
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59
src/x87/code-stubs-x87.cc
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@ -1900,6 +1900,10 @@ void CallICStub::Generate(MacroAssembler* masm) {
// edi - function
// edx - slot id
Isolate* isolate = masm->isolate();
const int with_types_offset =
FixedArray::OffsetOfElementAt(TypeFeedbackVector::kWithTypesIndex);
const int generic_offset =
FixedArray::OffsetOfElementAt(TypeFeedbackVector::kGenericCountIndex);
Label extra_checks_or_miss, slow_start;
Label slow, non_function, wrap, cont;
Label have_js_function;
@ -1939,35 +1943,66 @@ void CallICStub::Generate(MacroAssembler* masm) {
}
__ bind(&extra_checks_or_miss);
Label miss;
Label uninitialized, miss;
__ mov(ecx, FieldOperand(ebx, edx, times_half_pointer_size,
FixedArray::kHeaderSize));
__ cmp(ecx, Immediate(TypeFeedbackVector::MegamorphicSentinel(isolate)));
__ j(equal, &slow_start);
__ cmp(ecx, Immediate(TypeFeedbackVector::UninitializedSentinel(isolate)));
__ j(equal, &miss);
if (!FLAG_trace_ic) {
// The following cases attempt to handle MISS cases without going to the
// runtime.
if (FLAG_trace_ic) {
__ jmp(&miss);
}
__ cmp(ecx, Immediate(TypeFeedbackVector::UninitializedSentinel(isolate)));
__ j(equal, &uninitialized);
// We are going megamorphic. If the feedback is a JSFunction, it is fine
// to handle it here. More complex cases are dealt with in the runtime.
__ AssertNotSmi(ecx);
__ CmpObjectType(ecx, JS_FUNCTION_TYPE, ecx);
__ j(not_equal, &miss);
__ mov(FieldOperand(ebx, edx, times_half_pointer_size,
FixedArray::kHeaderSize),
__ mov(
FieldOperand(ebx, edx, times_half_pointer_size, FixedArray::kHeaderSize),
Immediate(TypeFeedbackVector::MegamorphicSentinel(isolate)));
// We have to update statistics for runtime profiling.
const int with_types_offset =
FixedArray::OffsetOfElementAt(TypeFeedbackVector::kWithTypesIndex);
__ sub(FieldOperand(ebx, with_types_offset), Immediate(Smi::FromInt(1)));
const int generic_offset =
FixedArray::OffsetOfElementAt(TypeFeedbackVector::kGenericCountIndex);
__ add(FieldOperand(ebx, generic_offset), Immediate(Smi::FromInt(1)));
__ jmp(&slow_start);
}
// We are here because tracing is on or we are going monomorphic.
__ bind(&uninitialized);
// We are going monomorphic, provided we actually have a JSFunction.
__ JumpIfSmi(edi, &miss);
// Goto miss case if we do not have a function.
__ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);
__ j(not_equal, &miss);
// Make sure the function is not the Array() function, which requires special
// behavior on MISS.
__ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, ecx);
__ cmp(edi, ecx);
__ j(equal, &miss);
// Update stats.
__ add(FieldOperand(ebx, with_types_offset), Immediate(Smi::FromInt(1)));
// Store the function.
__ mov(
FieldOperand(ebx, edx, times_half_pointer_size, FixedArray::kHeaderSize),
edi);
// Update the write barrier.
__ mov(eax, edi);
__ RecordWriteArray(ebx, eax, edx, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
__ jmp(&have_js_function);
// We are here because tracing is on or we encountered a MISS case we can't
// handle here.
__ bind(&miss);
GenerateMiss(masm);