a761ba0f2d
rL369567 reverted a couple of recent changes made to ARMParallelDSP because of a miscompilation error: PR43073. The issue stemmed from an underlying bug that was caused by adding muls into a reduction before it was proved that they could be executed in parallel with another mul. Most of the changes here are from the previously reverted commits. The additional changes have been made area: 1) The Search function now doesn't insert any muls into the Reduction object. That now happens once the search has successfully finished. 2) For any muls added into the reduction but that weren't paired, we accumulate their values as an input into the smlad. Differential Revision: https://reviews.llvm.org/D66660 llvm-svn: 370171
49 lines
1.7 KiB
LLVM
49 lines
1.7 KiB
LLVM
; RUN: opt -mtriple=arm-arm-eabi -mcpu=cortex-m33 < %s -arm-parallel-dsp -S | FileCheck %s
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;
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; The loop header is not the loop latch.
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;
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; CHECK: call i32 @llvm.arm.smlad
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;
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define dso_local i32 @test(i32 %arg, i32* nocapture readnone %arg1, i16* nocapture readonly %arg2, i16* nocapture readonly %arg3) {
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entry:
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%cmp24 = icmp sgt i32 %arg, 0
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br i1 %cmp24, label %for.body.preheader, label %for.cond.cleanup
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for.body.preheader:
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%.pre = load i16, i16* %arg3, align 2
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%.pre27 = load i16, i16* %arg2, align 2
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br label %for.body
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for.cond.cleanup:
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%mac1.0.lcssa = phi i32 [ 0, %entry ], [ %add11, %for.body ]
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ret i32 %mac1.0.lcssa
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; This is the loop header:
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for.body:
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%mac1.026 = phi i32 [ %add11, %for.body2 ], [ 0, %for.body.preheader ]
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%i.025 = phi i32 [ %add, %for.body2 ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i16, i16* %arg3, i32 %i.025
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%0 = load i16, i16* %arrayidx, align 2
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%add = add nuw nsw i32 %i.025, 1
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%arrayidx1 = getelementptr inbounds i16, i16* %arg3, i32 %add
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%1 = load i16, i16* %arrayidx1, align 2
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%arrayidx3 = getelementptr inbounds i16, i16* %arg2, i32 %i.025
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%2 = load i16, i16* %arrayidx3, align 2
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%conv = sext i16 %2 to i32
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%conv4 = sext i16 %0 to i32
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%mul = mul nsw i32 %conv, %conv4
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%arrayidx6 = getelementptr inbounds i16, i16* %arg2, i32 %add
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%3 = load i16, i16* %arrayidx6, align 2
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%conv7 = sext i16 %3 to i32
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%conv8 = sext i16 %1 to i32
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%mul9 = mul nsw i32 %conv7, %conv8
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%add10 = add i32 %mul, %mac1.026
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%add11 = add i32 %mul9, %add10
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%exitcond = icmp ne i32 %add, %arg
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br i1 %exitcond, label %for.body2, label %for.cond.cleanup
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; And this is the loop latch:
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for.body2:
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br label %for.body
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}
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