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Unified Diff: runtime/vm/stub_code_x64.cc

Issue 2895183002: More compact string representation on 64 bit. (Closed)
Patch Set: Created 3 years, 7 months ago
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Index: runtime/vm/stub_code_x64.cc
diff --git a/runtime/vm/stub_code_x64.cc b/runtime/vm/stub_code_x64.cc
index 733a7bc34d51ae471da51b2ccf409aa19ac72c9d..cbda5c38f6fd8a561f22b4a9a48b5dab92efa4ec 100644
--- a/runtime/vm/stub_code_x64.cc
+++ b/runtime/vm/stub_code_x64.cc
@@ -655,8 +655,10 @@ void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
NOT_IN_PRODUCT(
__ MaybeTraceAllocation(kArrayCid, &slow_case, Assembler::kFarJump));
- const intptr_t fixed_size = sizeof(RawArray) + kObjectAlignment - 1;
- __ leaq(RDI, Address(RDI, TIMES_4, fixed_size)); // RDI is a Smi.
+ const intptr_t fixed_size_plus_alignment_padding =
+ sizeof(RawArray) + kObjectAlignment - 1;
+ // RDI is a Smi.
+ __ leaq(RDI, Address(RDI, TIMES_4, fixed_size_plus_alignment_padding));
ASSERT(kSmiTagShift == 1);
__ andq(RDI, Immediate(-kObjectAlignment));
@@ -897,8 +899,9 @@ void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
Label slow_case;
// First compute the rounded instance size.
// R10: number of context variables.
- intptr_t fixed_size = (sizeof(RawContext) + kObjectAlignment - 1);
- __ leaq(R13, Address(R10, TIMES_8, fixed_size));
+ intptr_t fixed_size_plus_alignment_padding =
+ (sizeof(RawContext) + kObjectAlignment - 1);
+ __ leaq(R13, Address(R10, TIMES_8, fixed_size_plus_alignment_padding));
__ andq(R13, Immediate(-kObjectAlignment));
// Check for allocation tracing.
@@ -942,7 +945,7 @@ void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
// R10: number of context variables.
{
Label size_tag_overflow, done;
- __ leaq(R13, Address(R10, TIMES_8, fixed_size));
+ __ leaq(R13, Address(R10, TIMES_8, fixed_size_plus_alignment_padding));
__ andq(R13, Immediate(-kObjectAlignment));
__ cmpq(R13, Immediate(RawObject::SizeTag::kMaxSizeTag));
__ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
@@ -2260,8 +2263,8 @@ void StubCode::GenerateUnlinkedCallStub(Assembler* assembler) {
void StubCode::GenerateSingleTargetCallStub(Assembler* assembler) {
Label miss;
__ LoadClassIdMayBeSmi(RAX, RDI);
- __ movl(R9, FieldAddress(RBX, SingleTargetCache::lower_limit_offset()));
- __ movl(R10, FieldAddress(RBX, SingleTargetCache::upper_limit_offset()));
+ __ movzxw(R9, FieldAddress(RBX, SingleTargetCache::lower_limit_offset()));
+ __ movzxw(R10, FieldAddress(RBX, SingleTargetCache::upper_limit_offset()));
__ cmpq(RAX, R9);
__ j(LESS, &miss, Assembler::kNearJump);
__ cmpq(RAX, R10);
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