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Unified Diff: src/compiler/x64/code-generator-x64.cc

Issue 2446543002: [turbofan] Support variable size argument popping in TF-generated functions (Closed)
Patch Set: Fix tests and arm64 Created 4 years, 1 month ago
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Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 0c2412fc5cfeaf7863f3dbe4491c50386afdf66c..8bd9e89b0525a893812aa69659288dbd1f4eb6a5 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -4,6 +4,8 @@
#include "src/compiler/code-generator.h"
+#include <limits>
+
#include "src/compilation-info.h"
#include "src/compiler/code-generator-impl.h"
#include "src/compiler/gap-resolver.h"
@@ -918,7 +920,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
break;
}
case kArchRet:
- AssembleReturn();
+ AssembleReturn(instr->InputAt(0));
break;
case kArchStackPointer:
__ movq(i.OutputRegister(), rsp);
@@ -2447,8 +2449,7 @@ void CodeGenerator::AssembleConstructFrame() {
}
}
-
-void CodeGenerator::AssembleReturn() {
+void CodeGenerator::AssembleReturn(InstructionOperand* pop) {
CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
// Restore registers.
@@ -2477,22 +2478,41 @@ void CodeGenerator::AssembleReturn() {
unwinding_info_writer_.MarkBlockWillExit();
+ // Might need rcx for scratch if pop_size is too big or if there is a variable
+ // pop count.
+ DCHECK_EQ(0u, descriptor->CalleeSavedRegisters() & rcx.bit());
+ DCHECK_EQ(0u, descriptor->CalleeSavedRegisters() & rdx.bit());
+ size_t pop_size = descriptor->StackParameterCount() * kPointerSize;
+ X64OperandConverter g(this, nullptr);
if (descriptor->IsCFunctionCall()) {
AssembleDeconstructFrame();
} else if (frame_access_state()->has_frame()) {
- // Canonicalize JSFunction return sites for now.
- if (return_label_.is_bound()) {
- __ jmp(&return_label_);
- return;
+ if (pop->IsImmediate() && g.ToConstant(pop).ToInt32() == 0) {
+ // Canonicalize JSFunction return sites for now.
+ if (return_label_.is_bound()) {
+ __ jmp(&return_label_);
+ return;
+ } else {
+ __ bind(&return_label_);
+ AssembleDeconstructFrame();
+ }
} else {
- __ bind(&return_label_);
AssembleDeconstructFrame();
}
}
- size_t pop_size = descriptor->StackParameterCount() * kPointerSize;
- // Might need rcx for scratch if pop_size is too big.
- DCHECK_EQ(0u, descriptor->CalleeSavedRegisters() & rcx.bit());
- __ Ret(static_cast<int>(pop_size), rcx);
+
+ if (pop->IsImmediate()) {
+ DCHECK_EQ(Constant::kInt32, g.ToConstant(pop).type());
+ pop_size += g.ToConstant(pop).ToInt32() * kPointerSize;
+ CHECK_LT(pop_size, std::numeric_limits<int>::max());
+ __ Ret(static_cast<int>(pop_size), rcx);
+ } else {
+ Register pop_reg = g.ToRegister(pop);
+ Register scratch_reg = pop_reg.is(rcx) ? rdx : rcx;
+ __ popq(scratch_reg);
+ __ leaq(rsp, Operand(rsp, pop_reg, times_8, static_cast<int>(pop_size)));
+ __ jmp(scratch_reg);
+ }
}
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