Revision: 19324
Author: [email protected]
Date: Wed Feb 12 12:44:01 2014 UTC
Log: [a64] Omit redundant smi checks in write barriers.
[email protected]
Review URL: https://codereview.chromium.org/156603007
http://code.google.com/p/v8/source/detail?r=19324
Modified:
/branches/bleeding_edge/src/a64/lithium-codegen-a64.cc
=======================================
--- /branches/bleeding_edge/src/a64/lithium-codegen-a64.cc Wed Feb 12
09:19:30 2014 UTC
+++ /branches/bleeding_edge/src/a64/lithium-codegen-a64.cc Wed Feb 12
12:44:01 2014 UTC
@@ -5051,11 +5051,17 @@
}
Handle<Map> transition = instr->transition();
+ SmiCheck check_needed =
+ instr->hydrogen()->value()->IsHeapObject()
+ ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
Register value = ToRegister(instr->value());
if (!instr->hydrogen()->value()->type().IsHeapObject()) {
DeoptimizeIfSmi(value, instr->environment());
+
+ // We know that value is a smi now, so we can omit the check below.
+ check_needed = OMIT_SMI_CHECK;
}
} else if (representation.IsDouble()) {
ASSERT(transition.is_null());
@@ -5087,9 +5093,6 @@
// Do the store.
Register value = ToRegister(instr->value());
Register destination;
- SmiCheck check_needed =
- instr->hydrogen()->value()->IsHeapObject()
- ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
if (access.IsInobject()) {
destination = object;
} else {
--
--
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