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[AArch64][GlobalISel] Fall back when translating musttail calls

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These are currently translated as normal functions calls in AArch64.

Until we have proper tail call lowering, we shouldn't translate these.

Differential Revision: https://reviews.llvm.org/D66842

llvm-svn: 370225
This commit is contained in:
Jessica Paquette 2019-08-28 16:19:01 +00:00
parent ca21fc4ae3
commit 981e1678af
4 changed files with 18 additions and 0 deletions
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3
include/llvm/CodeGen/GlobalISel/CallLowering.h
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@ -80,6 +80,9 @@ public:
Register SwiftErrorVReg = 0;
MDNode *KnownCallees = nullptr;
/// True if the call must be tail call optimized.
bool IsMustTailCall = false;
};
/// Argument handling is mostly uniform between the four places that

1
lib/CodeGen/GlobalISel/CallLowering.cpp
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@ -62,6 +62,7 @@ bool CallLowering::lowerCall(MachineIRBuilder &MIRBuilder, ImmutableCallSite CS,
CS.getInstruction()->getMetadata(LLVMContext::MD_callees);
Info.CallConv = CS.getCallingConv();
Info.SwiftErrorVReg = SwiftErrorVReg;
Info.IsMustTailCall = CS.isMustTailCall();
return lowerCall(MIRBuilder, Info);
}

5
lib/Target/AArch64/AArch64CallLowering.cpp
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@ -409,6 +409,11 @@ bool AArch64CallLowering::lowerCall(MachineIRBuilder &MIRBuilder,
MachineRegisterInfo &MRI = MF.getRegInfo();
auto &DL = F.getParent()->getDataLayout();
if (Info.IsMustTailCall) {
LLVM_DEBUG(dbgs() << "Cannot lower musttail calls yet.\n");
return false;
}
SmallVector<ArgInfo, 8> SplitArgs;
for (auto &OrigArg : Info.OrigArgs) {
splitToValueTypes(OrigArg, SplitArgs, DL, MRI, Info.CallConv);

9
test/CodeGen/AArch64/GlobalISel/call-translator-musttail.ll Normal file
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@ -0,0 +1,9 @@
; RUN: not llc %s -mtriple aarch64-unknown-unknown -debug-only=aarch64-call-lowering -global-isel -o - 2>&1 | FileCheck %s
; CHECK: Cannot lower musttail calls yet.
; CHECK-NEXT: LLVM ERROR: unable to translate instruction: call (in function: foo)
declare void @must_callee(i8*)
define void @foo(i32*) {
musttail call void @must_callee(i8* null)
ret void
}