Revision: 21547
Author: [email protected]
Date: Wed May 28 08:16:11 2014 UTC
Log: X87: Avoid HeapObject check in HStoreNamedField.
port r21509 (78a54b0)
Original commit message:
This way an HStoreNamedField instruction can never deoptimize
itself, which is another important step towards a working
store elimination.
BUG=
[email protected]
Review URL: https://codereview.chromium.org/306483013
http://code.google.com/p/v8/source/detail?r=21547
Modified:
/branches/bleeding_edge/src/x87/lithium-codegen-x87.cc
/branches/bleeding_edge/src/x87/lithium-x87.cc
/branches/bleeding_edge/src/x87/macro-assembler-x87.cc
=======================================
--- /branches/bleeding_edge/src/x87/lithium-codegen-x87.cc Wed May 28
04:56:28 2014 UTC
+++ /branches/bleeding_edge/src/x87/lithium-codegen-x87.cc Wed May 28
08:16:11 2014 UTC
@@ -3888,30 +3888,11 @@
}
Register object = ToRegister(instr->object());
- SmiCheck check_needed =
- instr->hydrogen()->value()->IsHeapObject()
- ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
-
- ASSERT(!(representation.IsSmi() &&
- instr->value()->IsConstantOperand() &&
- !IsSmi(LConstantOperand::cast(instr->value()))));
- if (representation.IsHeapObject()) {
- if (instr->value()->IsConstantOperand()) {
- LConstantOperand* operand_value =
LConstantOperand::cast(instr->value());
- if (chunk_->LookupConstant(operand_value)->HasSmiValue()) {
- DeoptimizeIf(no_condition, instr->environment());
- }
- } else {
- if (!instr->hydrogen()->value()->type().IsHeapObject()) {
- Register value = ToRegister(instr->value());
- __ test(value, Immediate(kSmiTagMask));
- DeoptimizeIf(zero, instr->environment());
-
- // We know now that value is not a smi, so we can omit the check
below.
- check_needed = OMIT_SMI_CHECK;
- }
- }
- } else if (representation.IsDouble()) {
+ __ AssertNotSmi(object);
+ ASSERT(!representation.IsSmi() ||
+ !instr->value()->IsConstantOperand() ||
+ IsSmi(LConstantOperand::cast(instr->value())));
+ if (representation.IsDouble()) {
ASSERT(access.IsInobject());
ASSERT(!instr->hydrogen()->has_transition());
ASSERT(!instr->hydrogen()->NeedsWriteBarrier());
@@ -3976,7 +3957,7 @@
value,
temp,
EMIT_REMEMBERED_SET,
- check_needed);
+ instr->hydrogen()->SmiCheckForWriteBarrier());
}
}
=======================================
--- /branches/bleeding_edge/src/x87/lithium-x87.cc Fri May 23 16:37:27 2014
UTC
+++ /branches/bleeding_edge/src/x87/lithium-x87.cc Wed May 28 08:16:11 2014
UTC
@@ -2379,16 +2379,7 @@
// We need a temporary register for write barrier of the map field.
LOperand* temp_map = needs_write_barrier_for_map ? TempRegister() : NULL;
- LInstruction* result =
- new(zone()) LStoreNamedField(obj, val, temp, temp_map);
- if (!instr->access().IsExternalMemory() &&
- instr->field_representation().IsHeapObject() &&
- (val->IsConstantOperand()
- ? HConstant::cast(instr->value())->HasSmiValue()
- : !instr->value()->type().IsHeapObject())) {
- result = AssignEnvironment(result);
- }
- return result;
+ return new(zone()) LStoreNamedField(obj, val, temp, temp_map);
}
=======================================
--- /branches/bleeding_edge/src/x87/macro-assembler-x87.cc Tue May 27
09:38:01 2014 UTC
+++ /branches/bleeding_edge/src/x87/macro-assembler-x87.cc Wed May 28
08:16:11 2014 UTC
@@ -55,6 +55,11 @@
} else if (r.IsInteger16() || r.IsUInteger16()) {
mov_w(dst, src);
} else {
+ if (r.IsHeapObject()) {
+ AssertNotSmi(src);
+ } else if (r.IsSmi()) {
+ AssertSmi(src);
+ }
mov(dst, src);
}
}
--
--
v8-dev mailing list
[email protected]
http://groups.google.com/group/v8-dev
---
You received this message because you are subscribed to the Google Groups "v8-dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
