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Unified Diff: src/compiler/x64/instruction-selector-x64.cc

Issue 1108563002: Detect simple tail calls (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Fixed index type Created 5 years, 8 months ago
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Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index e0e97acfce5c4ed181ec86efd00639c1f263300b..c0a6175eef3c7aa340bcf3a302c85265680d8be9 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -1019,7 +1019,8 @@ void InstructionSelector::VisitFloat64RoundTiesAway(Node* node) {
}
-void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
+void InstructionSelector::VisitCall(Node* node, BasicBlock* handler,
+ CallMode call_mode) {
X64OperandGenerator g(this);
const CallDescriptor* descriptor = OpParameter<const CallDescriptor*>(node);
@@ -1052,14 +1053,15 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
}
// Select the appropriate opcode based on the call type.
+ bool is_tail_call = call_mode == TAIL_CALL;
InstructionCode opcode;
switch (descriptor->kind()) {
case CallDescriptor::kCallCodeObject: {
- opcode = kArchCallCodeObject;
+ opcode = is_tail_call ? kArchTailCallCodeObject : kArchCallCodeObject;
break;
}
case CallDescriptor::kCallJSFunction:
- opcode = kArchCallJSFunction;
+ opcode = is_tail_call ? kArchTailCallJSFunction : kArchCallJSFunction;
break;
default:
UNREACHABLE();
@@ -1068,11 +1070,12 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
opcode |= MiscField::encode(flags);
// Emit the call instruction.
+ size_t size = is_tail_call ? 0 : buffer.outputs.size();
InstructionOperand* first_output =
- buffer.outputs.size() > 0 ? &buffer.outputs.front() : NULL;
+ size > 0 ? &buffer.outputs.front() : nullptr;
Instruction* call_instr =
- Emit(opcode, buffer.outputs.size(), first_output,
- buffer.instruction_args.size(), &buffer.instruction_args.front());
+ Emit(opcode, size, first_output, buffer.instruction_args.size(),
+ &buffer.instruction_args.front());
call_instr->MarkAsCall();
}
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