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c4518513f4
This avoids a potential infinite loop setting and unsetting bits in the mask. Reduced from a failure on the polly-aosp bot. Differential Revision: https://reviews.llvm.org/D51066 llvm-svn: 340446
36 lines
1.0 KiB
LLVM
36 lines
1.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=arm-eabi < %s | FileCheck %s
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; Make sure this doesn't hang, and there are no unnecessary
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; "and" instructions.
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define dso_local void @f(i16* %p) {
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; CHECK-LABEL: f:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: .LBB0_1: @ %bb
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; CHECK-NEXT: @ =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: ldrh r1, [r0]
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; CHECK-NEXT: and r2, r1, #255
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; CHECK-NEXT: add r3, r2, r1, lsr #8
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; CHECK-NEXT: add r2, r3, r2
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; CHECK-NEXT: add r1, r2, r1, lsr #8
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; CHECK-NEXT: add r1, r1, #2
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; CHECK-NEXT: lsr r1, r1, #2
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; CHECK-NEXT: strh r1, [r0]
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; CHECK-NEXT: b .LBB0_1
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entry:
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br label %bb
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bb:
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%_p_scalar_ = load i16, i16* %p, align 2
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%p_and = and i16 %_p_scalar_, 255
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%p_ = lshr i16 %_p_scalar_, 8
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%p_add = add nuw nsw i16 %p_, 2
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%p_add14 = add nuw nsw i16 %p_add, %p_and
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%p_add18 = add nuw nsw i16 %p_add14, %p_and
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%p_add19 = add nuw nsw i16 %p_add18, %p_
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%p_200 = lshr i16 %p_add19, 2
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store i16 %p_200, i16* %p, align 2
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br label %bb
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}
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