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Fix a compiler-abort on a testcase where the stack-pointer is added to 

a symbolic constant. This is unlikely to be intentional, but it
shouldn't crash the compiler.

llvm-svn: 61408
This commit is contained in:
Dan Gohman 2008-12-24 00:27:51 +00:00
parent 4b46b74ece
commit 198b8e78c3
2 changed files with 46 additions and 6 deletions
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19
llvm/lib/Target/X86/X86RegisterInfo.cpp
View File

@ -454,12 +454,19 @@ void X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// FrameIndex with base register with EBP. Add an offset to the offset.
MI.getOperand(i).ChangeToRegister(BasePtr, false);
// Now add the frame object offset to the offset from EBP. Offset is a
// 32-bit integer.
int Offset = getFrameIndexOffset(MF, FrameIndex) +
(int)(MI.getOperand(i+3).getImm());
MI.getOperand(i+3).ChangeToImmediate(Offset);
// Now add the frame object offset to the offset from EBP.
if (MI.getOperand(i+3).isImm()) {
// Offset is a 32-bit integer.
int Offset = getFrameIndexOffset(MF, FrameIndex) +
(int)(MI.getOperand(i+3).getImm());
MI.getOperand(i+3).ChangeToImmediate(Offset);
} else {
// Offset is symbolic. This is extremely rare.
uint64_t Offset = getFrameIndexOffset(MF, FrameIndex) +
(uint64_t)MI.getOperand(i+3).getOffset();
MI.getOperand(i+3).setOffset(Offset);
}
}
void

33
llvm/test/CodeGen/X86/2008-12-23-crazy-address.ll Normal file
View File

@ -0,0 +1,33 @@
; RUN: llvm-as < %s | llc -march=x86 -relocation-model=static | grep {lea.*X.*esp} | count 2
@X = external global [0 x i32]
define void @foo() nounwind {
entry:
%Y = alloca i32
call void @frob(i32* %Y) nounwind
%Y3 = bitcast i32* %Y to i8*
%ctg2 = getelementptr i8* %Y3, i32 ptrtoint ([0 x i32]* @X to i32)
%0 = ptrtoint i8* %ctg2 to i32
call void @borf(i32 %0) nounwind
ret void
}
define void @bar(i32 %i) nounwind {
entry:
%Y = alloca [10 x i32]
%0 = getelementptr [10 x i32]* %Y, i32 0, i32 0
call void @frob(i32* %0) nounwind
%1 = getelementptr [0 x i32]* @X, i32 0, i32 %i
%2 = getelementptr [10 x i32]* %Y, i32 0, i32 0
%3 = ptrtoint i32* %2 to i32
%4 = bitcast i32* %1 to i8*
%ctg2 = getelementptr i8* %4, i32 %3
%5 = ptrtoint i8* %ctg2 to i32
call void @borf(i32 %5) nounwind
ret void
}
declare void @frob(i32*)
declare void @borf(i32)