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Unified Diff: src/crankshaft/arm64/lithium-codegen-arm64.cc

Issue 1899813003: [crankshaft] Fragmentation-free allocation folding. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 4 years, 7 months ago
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Index: src/crankshaft/arm64/lithium-codegen-arm64.cc
diff --git a/src/crankshaft/arm64/lithium-codegen-arm64.cc b/src/crankshaft/arm64/lithium-codegen-arm64.cc
index 0d6ceafd46f8fcece5cef850f43c25df7134f271..ddc6ad755f1b58616d26f36426dee9f349c69db3 100644
--- a/src/crankshaft/arm64/lithium-codegen-arm64.cc
+++ b/src/crankshaft/arm64/lithium-codegen-arm64.cc
@@ -1426,6 +1426,14 @@ void LCodeGen::DoAllocate(LAllocate* instr) {
flags = static_cast<AllocationFlags>(flags | PRETENURE);
}
+ if (instr->hydrogen()->IsAllocationFoldingDominator()) {
+ flags = static_cast<AllocationFlags>(flags | ALLOCATION_FOLDING_DOMINATOR);
+ }
+
+ if (instr->hydrogen()->IsAllocationFolded()) {
+ flags = static_cast<AllocationFlags>(flags | ALLOCATION_FOLDED);
+ }
+
if (instr->size()->IsConstantOperand()) {
int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
CHECK(size <= Page::kMaxRegularHeapObjectSize);
@@ -1487,6 +1495,50 @@ void LCodeGen::DoDeferredAllocate(LAllocate* instr) {
CallRuntimeFromDeferred(
Runtime::kAllocateInTargetSpace, 2, instr, instr->context());
__ StoreToSafepointRegisterSlot(x0, ToRegister(instr->result()));
+
+ if (instr->hydrogen()->IsAllocationFoldingDominator()) {
+ AllocationFlags allocation_flags = NO_ALLOCATION_FLAGS;
+ if (instr->hydrogen()->IsOldSpaceAllocation()) {
+ DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
+ allocation_flags = static_cast<AllocationFlags>(flags | PRETENURE);
+ }
+ // If the allocation folding dominator allocate triggered a GC, allocation
+ // happend in the runtime. We have to reset the top pointer to virtually
+ // undo the allocation.
+ ExternalReference allocation_top =
+ AllocationUtils::GetAllocationTopReference(isolate(), allocation_flags);
+ Register top_address = x10;
+ __ Sub(x0, x0, Operand(kHeapObjectTag));
+ __ Mov(top_address, Operand(allocation_top));
+ __ Str(x0, MemOperand(top_address));
+ __ Add(x0, x0, Operand(kHeapObjectTag));
+ }
+}
+
+void LCodeGen::DoFastAllocate(LFastAllocate* instr) {
+ DCHECK(instr->hydrogen()->IsAllocationFolded());
+ Register result = ToRegister(instr->result());
+ Register scratch1 = ToRegister(instr->temp1());
+ Register scratch2 = ToRegister(instr->temp2());
+
+ AllocationFlags flags = NO_ALLOCATION_FLAGS;
+ if (instr->hydrogen()->MustAllocateDoubleAligned()) {
+ flags = static_cast<AllocationFlags>(flags | DOUBLE_ALIGNMENT);
+ }
+ if (instr->hydrogen()->IsOldSpaceAllocation()) {
+ DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
+ flags = static_cast<AllocationFlags>(flags | PRETENURE);
+ }
+ if (!instr->hydrogen()->IsAllocationFoldingDominator()) {
+ if (instr->size()->IsConstantOperand()) {
+ int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
+ CHECK(size <= Page::kMaxRegularHeapObjectSize);
+ __ FastAllocate(size, result, scratch1, scratch2, flags);
+ } else {
+ Register size = ToRegister(instr->size());
+ __ FastAllocate(size, result, scratch1, scratch2, flags);
+ }
+ }
}
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