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Load folding tail call should not use ebp / rbp after it's popped. PEI
should use esp / rsp to reference frame instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102596 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -608,8 +608,12 @@ X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
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int FrameIndex = MI.getOperand(i).getIndex();
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unsigned BasePtr;
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unsigned Opc = MI.getOpcode();
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bool AfterFPPop = Opc == X86::TAILJMPm64 || Opc == X86::TAILJMPm;
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if (needsStackRealignment(MF))
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BasePtr = (FrameIndex < 0 ? FramePtr : StackPtr);
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else if (AfterFPPop)
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BasePtr = StackPtr;
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else
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BasePtr = (hasFP(MF) ? FramePtr : StackPtr);
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@ -618,16 +622,22 @@ X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
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MI.getOperand(i).ChangeToRegister(BasePtr, false);
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// Now add the frame object offset to the offset from EBP.
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int FIOffset;
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if (AfterFPPop) {
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// Tail call jmp happens after FP is popped.
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const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
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const MachineFrameInfo *MFI = MF.getFrameInfo();
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FIOffset = MFI->getObjectOffset(FrameIndex) - TFI.getOffsetOfLocalArea();
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} else
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FIOffset = getFrameIndexOffset(MF, FrameIndex);
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if (MI.getOperand(i+3).isImm()) {
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// Offset is a 32-bit integer.
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int Offset = getFrameIndexOffset(MF, FrameIndex) +
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(int)(MI.getOperand(i + 3).getImm());
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int Offset = FIOffset + (int)(MI.getOperand(i + 3).getImm());
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MI.getOperand(i + 3).ChangeToImmediate(Offset);
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} else {
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// Offset is symbolic. This is extremely rare.
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uint64_t Offset = getFrameIndexOffset(MF, FrameIndex) +
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(uint64_t)MI.getOperand(i+3).getOffset();
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uint64_t Offset = FIOffset + (uint64_t)MI.getOperand(i+3).getOffset();
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MI.getOperand(i+3).setOffset(Offset);
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}
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return 0;
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52
test/CodeGen/X86/sibcall-2.ll
Normal file
52
test/CodeGen/X86/sibcall-2.ll
Normal file
@ -0,0 +1,52 @@
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; RUN: llc < %s -mtriple=i386-apple-darwin -disable-fp-elim | FileCheck %s -check-prefix=32
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; RUN: llc < %s -mtriple=x86_64-apple-darwin -disable-fp-elim | FileCheck %s -check-prefix=64
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; Tail call should not use ebp / rbp after it's popped. Use esp / rsp.
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define void @t1(i8* nocapture %value) nounwind {
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entry:
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; 32: t1:
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; 32: jmpl *4(%esp)
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; 64: t1:
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; 64: jmpq *%rdi
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%0 = bitcast i8* %value to void ()*
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tail call void %0() nounwind
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ret void
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}
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define void @t2(i32 %a, i8* nocapture %value) nounwind {
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entry:
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; 32: t2:
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; 32: jmpl *8(%esp)
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; 64: t2:
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; 64: jmpq *%rsi
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%0 = bitcast i8* %value to void ()*
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tail call void %0() nounwind
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ret void
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}
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define void @t3(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i8* nocapture %value) nounwind {
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entry:
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; 32: t3:
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; 32: jmpl *28(%esp)
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; 64: t3:
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; 64: jmpq *8(%rsp)
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%0 = bitcast i8* %value to void ()*
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tail call void %0() nounwind
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ret void
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}
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define void @t4(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i8* nocapture %value) nounwind {
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entry:
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; 32: t4:
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; 32: jmpl *32(%esp)
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; 64: t4:
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; 64: jmpq *16(%rsp)
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%0 = bitcast i8* %value to void ()*
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tail call void %0() nounwind
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ret void
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}
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