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Don't PerformSHLSimplify if the given node is used by a node that also uses a constant because we may get stuck in an infinite combine loop. bugzilla: https://bugs.llvm.org/show_bug.cgi?id=36577 Patch by Sam Parker. Differential Revision: https://reviews.llvm.org/D44097 llvm-svn: 326882
29 lines
951 B
LLVM
29 lines
951 B
LLVM
; RUN: llc -mtriple armv6t2 %s -o - | FileCheck %s
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; RUN: llc -mtriple thumbv6t2 %s -o - | FileCheck %s --check-prefix=CHECK-T2
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; RUN: llc -mtriple armv7 %s -o - | FileCheck %s
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; RUN: llc -mtriple thumbv7 %s -o - | FileCheck %s --check-prefix=CHECK-T2
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; RUN: llc -mtriple thumbv7m %s -o - | FileCheck %s --check-prefix=CHECK-T2
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; RUN: llc -mtriple thumbv8m.main %s -o - | FileCheck %s --check-prefix=CHECK-T2
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@a = common dso_local local_unnamed_addr global i16 0, align 2
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; CHECK-LABEL: pr36577
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; CHECK: ldrh r0, [r0]
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; CHECK: bic r0, r1, r0, lsr #5
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; CHECK: mvn r1, #7
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; CHECK: orr r0, r0, r1
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; CHECK-T2: ldrh r0, [r0]
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; CHECK-T2: bic.w r0, r1, r0, lsr #5
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; CHECK-T2: orn r0, r0, #7
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define dso_local arm_aapcscc i32** @pr36577() {
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entry:
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%0 = load i16, i16* @a, align 2
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%1 = lshr i16 %0, 7
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%2 = and i16 %1, 1
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%3 = zext i16 %2 to i32
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%4 = xor i32 %3, -1
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%add.ptr = getelementptr inbounds i32*, i32** null, i32 %4
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ret i32** %add.ptr
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}
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