38 lines
1.1 KiB
LLVM
38 lines
1.1 KiB
LLVM
; fastisel should not fold add with non-pointer bitwidth
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; sext(a) + sext(b) != sext(a + b)
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; RUN: llc -mtriple=x86_64-apple-darwin %s -O0 -o - | FileCheck %s
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define zeroext i8 @gep_promotion(i8* %ptr) nounwind uwtable ssp {
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entry:
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%ptr.addr = alloca i8*, align 8
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%add = add i8 64, 64 ; 0x40 + 0x40
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%0 = load i8*, i8** %ptr.addr, align 8
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; CHECK-LABEL: _gep_promotion:
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; CHECK: movzbl ({{.*}})
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%arrayidx = getelementptr inbounds i8, i8* %0, i8 %add
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%1 = load i8, i8* %arrayidx, align 1
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ret i8 %1
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}
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define zeroext i8 @gep_promotion_nonconst(i8 %i, i8* %ptr) nounwind uwtable ssp {
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entry:
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%i.addr = alloca i8, align 4
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%ptr.addr = alloca i8*, align 8
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store i8 %i, i8* %i.addr, align 4
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store i8* %ptr, i8** %ptr.addr, align 8
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%0 = load i8, i8* %i.addr, align 4
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; CHECK-LABEL: _gep_promotion_nonconst:
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; CHECK: movzbl ({{.*}})
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%xor = xor i8 %0, -128 ; %0 ^ 0x80
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%add = add i8 %xor, -127 ; %xor + 0x81
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%1 = load i8*, i8** %ptr.addr, align 8
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%arrayidx = getelementptr inbounds i8, i8* %1, i8 %add
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%2 = load i8, i8* %arrayidx, align 1
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ret i8 %2
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}
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