[PATCH] D60140: [GlobalISel] Add IRTranslator support for llvm.stacksave and llvm.stackrestore
Jessica Paquette via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Apr 2 10:50:06 PDT 2019
paquette created this revision.
paquette added reviewers: aemerson, arsenm, dsanders.
Herald added subscribers: Petar.Avramovic, volkan, hiraditya, kristof.beyls, javed.absar, rovka, wdng.
Herald added a project: LLVM.
Also update arm64-irtranslator.ll.
https://reviews.llvm.org/D60140
Files:
llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
Index: llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
===================================================================
--- llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
+++ llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
@@ -2359,3 +2359,15 @@
call void %f(i1 true)
ret void
}
+
+declare i8* @llvm.stacksave()
+declare void @llvm.stackrestore(i8*)
+define void @test_stacksaverestore() {
+ ; CHECK-LABEL: name: test_stacksaverestore
+ ; CHECK: [[SAVE:%[0-9]+]]:_(p0) = COPY $sp
+ ; CHECK-NEXT: $sp = COPY [[SAVE]](p0)
+ ; CHECK-NEXT: RET_ReallyLR
+ %sp = call i8* @llvm.stacksave()
+ call void @llvm.stackrestore(i8* %sp)
+ ret void
+}
Index: llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
===================================================================
--- llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -1046,6 +1046,34 @@
PtrTy.getSizeInBits() / 8, 8));
return true;
}
+ case Intrinsic::stacksave: {
+ // Save the stack pointer to the location provided by the intrinsic.
+ unsigned Reg = getOrCreateVReg(CI);
+ unsigned StackPtr = MF->getSubtarget()
+ .getTargetLowering()
+ ->getStackPointerRegisterToSaveRestore();
+
+ // If the target doesn't specify a stack pointer, then fall back.
+ if (!StackPtr)
+ return false;
+
+ MIRBuilder.buildCopy(Reg, StackPtr);
+ return true;
+ }
+ case Intrinsic::stackrestore: {
+ // Restore the stack pointer from the location provided by the intrinsic.
+ unsigned Reg = getOrCreateVReg(*CI.getArgOperand(0));
+ unsigned StackPtr = MF->getSubtarget()
+ .getTargetLowering()
+ ->getStackPointerRegisterToSaveRestore();
+
+ // If the target doesn't specify a stack pointer, then fall back.
+ if (!StackPtr)
+ return false;
+
+ MIRBuilder.buildCopy(StackPtr, Reg);
+ return true;
+ }
case Intrinsic::cttz:
case Intrinsic::ctlz: {
ConstantInt *Cst = cast<ConstantInt>(CI.getArgOperand(1));
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