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Unified Diff: src/compiler/ia32/instruction-selector-ia32.cc

Issue 1706763002: [turbofan] Emit memory operands for cmp and test on ia32 and x64 when it makes sense. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: x64 update only Created 4 years, 10 months ago
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Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 8e55a327c82b94a37ae777c88c66a157263092e8..24f30c637b031ae5bf28901746f2664fe1f963c6 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -991,29 +991,69 @@ namespace {
// Shared routine for multiple compare operations.
void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
- InstructionOperand left, InstructionOperand right,
- FlagsContinuation* cont) {
+ size_t left_operands_count, InstructionOperand* left_operands,
+ InstructionOperand right, FlagsContinuation* cont) {
+ DCHECK(left_operands_count > 0 && left_operands_count <= 4);
IA32OperandGenerator g(selector);
+ opcode = cont->Encode(opcode);
+ int input_count = 0;
+ InstructionOperand inputs[6];
+ do {
+ inputs[input_count] = left_operands[input_count];
+ } while (++input_count < left_operands_count);
+ inputs[input_count++] = right;
+
if (cont->IsBranch()) {
- selector->Emit(cont->Encode(opcode), g.NoOutput(), left, right,
- g.Label(cont->true_block()), g.Label(cont->false_block()));
+ inputs[input_count++] = g.Label(cont->true_block());
+ inputs[input_count++] = g.Label(cont->false_block());
+ selector->Emit(opcode, 0, nullptr, input_count, inputs);
} else {
DCHECK(cont->IsSet());
- selector->Emit(cont->Encode(opcode), g.DefineAsByteRegister(cont->result()),
- left, right);
+ InstructionOperand output = g.DefineAsRegister(cont->result());
+ selector->Emit(opcode, 1, &output, input_count, inputs);
+ }
+}
+
+// Determines if {input} of {node} can be replaced by a memory operand.
+bool CanUseMemoryOperand(InstructionSelector* selector, InstructionCode opcode,
+ Node* node, Node* input) {
+ if (input->opcode() != IrOpcode::kLoad || !selector->CanCover(node, input) ||
+ selector->GetEffectLevel(input) != selector->GetEffectLevel(node)) {
+ return false;
}
+ if (LoadRepresentationOf(input->op()).representation() ==
+ MachineRepresentation::kWord32) {
+ return (opcode == kIA32Cmp || opcode == kIA32Test);
+ }
+ return false;
+}
+
+// Shared routine for multiple compare operations.
+void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
+ InstructionOperand left, InstructionOperand right,
+ FlagsContinuation* cont) {
+ VisitCompare(selector, opcode, 1, &left, right, cont);
}
// Shared routine for multiple compare operations.
void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
Node* left, Node* right, FlagsContinuation* cont,
- bool commutative) {
+ bool commutative, Node* node = nullptr) {
IA32OperandGenerator g(selector);
if (commutative && g.CanBeBetterLeftOperand(right)) {
std::swap(left, right);
}
- VisitCompare(selector, opcode, g.UseRegister(left), g.Use(right), cont);
+ if (node && CanUseMemoryOperand(selector, opcode, node, left)) {
+ size_t input_count = 0;
+ InstructionOperand inputs[4];
+ AddressingMode addressing_mode =
+ g.GetEffectiveAddressMemoryOperand(left, inputs, &input_count);
+ opcode |= AddressingModeField::encode(addressing_mode);
+ VisitCompare(selector, opcode, input_count, inputs, g.Use(right), cont);
+ } else {
+ VisitCompare(selector, opcode, g.UseRegister(left), g.Use(right), cont);
+ }
}
@@ -1039,18 +1079,30 @@ void VisitFloat64Compare(InstructionSelector* selector, Node* node,
void VisitWordCompare(InstructionSelector* selector, Node* node,
InstructionCode opcode, FlagsContinuation* cont) {
IA32OperandGenerator g(selector);
- Node* const left = node->InputAt(0);
- Node* const right = node->InputAt(1);
+ Node* left = node->InputAt(0);
+ Node* right = node->InputAt(1);
- // Match immediates on left or right side of comparison.
- if (g.CanBeImmediate(right)) {
- VisitCompare(selector, opcode, g.Use(left), g.UseImmediate(right), cont);
- } else if (g.CanBeImmediate(left)) {
+ if (!g.CanBeImmediate(right) && g.CanBeImmediate(left)) {
if (!node->op()->HasProperty(Operator::kCommutative)) cont->Commute();
- VisitCompare(selector, opcode, g.Use(right), g.UseImmediate(left), cont);
+ std::swap(left, right);
+ }
+
+ // Match immediates on right side of comparison.
+ if (g.CanBeImmediate(right)) {
+ if (CanUseMemoryOperand(selector, opcode, node, left)) {
+ size_t left_operands_count = 0;
+ InstructionOperand left_operands[4];
+ AddressingMode addressing_mode = g.GetEffectiveAddressMemoryOperand(
+ left, left_operands, &left_operands_count);
+ opcode |= AddressingModeField::encode(addressing_mode);
+ VisitCompare(selector, opcode, left_operands_count, left_operands,
+ g.UseImmediate(right), cont);
+ } else {
+ VisitCompare(selector, opcode, g.Use(left), g.UseImmediate(right), cont);
+ }
} else {
VisitCompare(selector, opcode, left, right, cont,
- node->op()->HasProperty(Operator::kCommutative));
+ node->op()->HasProperty(Operator::kCommutative), node);
}
}

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