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4405b74d21
AArch64InstrInfo::optimizeCompareInstr has bug PR27158 which causes generation of incorrect code. A compare instruction is substituted with another instruction which does not produce the same flags as the original compare instruction. This patch contains: 1. Fix of the bug. 2. A regression test in MIR. 3. A new test to check that SUBS is replaced by SUB. Differential Revision: http://reviews.llvm.org/D18838 llvm-svn: 266969
24 lines
591 B
LLVM
24 lines
591 B
LLVM
; RUN: llc -mtriple=aarch64-linux-gnu -O3 -o - %s | FileCheck %s
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@a = external global i8, align 1
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@b = external global i8, align 1
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; Test that SUBS is replaced by SUB if condition flags are not used.
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define i32 @test01() nounwind {
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; CHECK: ldrb {{.*}}
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; CHECK-NEXT: ldrb {{.*}}
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; CHECK-NEXT: sub {{.*}}
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; CHECK-NEXT: cmn {{.*}}
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entry:
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%0 = load i8, i8* @a, align 1
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%conv = zext i8 %0 to i32
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%1 = load i8, i8* @b, align 1
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%conv1 = zext i8 %1 to i32
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%s = sub nsw i32 %conv1, %conv
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%cmp0 = icmp eq i32 %s, -1
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%cmp1 = sext i1 %cmp0 to i8
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store i8 %cmp1, i8* @a
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ret i32 0
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}
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