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MipsFastISel uses a a class to represent addresses with a signed member to represent the offset. MipsFastISel::emitStore, emitLoad and computeAddress all treated the offset as being positive. In cases where the offset was actually negative and a frame pointer was used, this would cause the constant synthesis routine to crash as it would generate an unexpected instruction sequence when frame indexes are replaced. Reviewers: vkalintiris Differential Revision: https://reviews.llvm.org/D26192 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287099 91177308-0d34-0410-b5e6-96231b3b80d8
19 lines
583 B
LLVM
19 lines
583 B
LLVM
; RUN: llc < %s -march=mipsel -mcpu=mips32 -fast-isel -disable-fp-elim -relocation-model=pic < %s
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; Test that negative array access don't crash constant synthesis when fast isel
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; generates negative offsets.
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define i16 @test() {
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%a = alloca [4 x i16], align 4
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%arrayidx = getelementptr inbounds [4 x i16], [4 x i16]* %a, i32 0, i32 -2
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%b = load i16, i16* %arrayidx, align 2
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ret i16 %b
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}
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define void @test2() {
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%a = alloca [4 x i16], align 4
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%arrayidx = getelementptr inbounds [4 x i16], [4 x i16]* %a, i32 0, i32 -2
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store i16 2, i16* %arrayidx, align 2
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ret void
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}
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