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e0107c42cc
This is a latent bug that's been hanging around for a while. For a loop-invariant
pointer, expandBounds would return the range {Ptr, Ptr}, but this was interpreted
as a half-open range, not a closed range. So we ended up planting incorrect
bounds checks. Even worse, they were tautological, so we ended up incorrectly
executing the optimized loop.
llvm-svn: 299526
53 lines
2.6 KiB
LLVM
53 lines
2.6 KiB
LLVM
; RUN: opt < %s -O1 -S -loop-versioning-licm -licm -debug-only=loop-versioning-licm -disable-loop-unrolling 2>&1 | FileCheck %s
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; REQUIRES: asserts
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;
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; Test to confirm loop is a good candidate for LoopVersioningLICM
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; It also confirms invariant moved out of loop.
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;
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; CHECK: Loop: Loop at depth 2 containing: %for.body3.us<header><latch><exiting>
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; CHECK-NEXT: Loop Versioning found to be beneficial
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;
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; CHECK: for.cond1.for.inc17_crit_edge.us.loopexit6: ; preds = %for.body3.us
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; CHECK-NEXT: %add14.us.lcssa = phi float [ %add14.us, %for.body3.us ]
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; CHECK-NEXT: store float %add14.us.lcssa, float* %arrayidx.us, align 4, !alias.scope !0, !noalias !0
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; CHECK-NEXT: br label %for.cond1.for.inc17_crit_edge.us
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;
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define i32 @foo(float* nocapture %var2, float** nocapture readonly %var3, i32 %itr) #0 {
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entry:
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%cmp38 = icmp sgt i32 %itr, 1
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br i1 %cmp38, label %for.body3.lr.ph.us, label %for.end19
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for.body3.us: ; preds = %for.body3.us, %for.body3.lr.ph.us
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%0 = phi float [ %.pre, %for.body3.lr.ph.us ], [ %add14.us, %for.body3.us ]
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%indvars.iv = phi i64 [ 1, %for.body3.lr.ph.us ], [ %indvars.iv.next, %for.body3.us ]
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%1 = trunc i64 %indvars.iv to i32
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%conv.us = sitofp i32 %1 to float
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%add.us = fadd float %conv.us, %0
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%arrayidx7.us = getelementptr inbounds float, float* %3, i64 %indvars.iv
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store float %add.us, float* %arrayidx7.us, align 4
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%2 = load float, float* %arrayidx.us, align 4
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%add14.us = fadd float %2, %add.us
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store float %add14.us, float* %arrayidx.us, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %itr
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br i1 %exitcond, label %for.cond1.for.inc17_crit_edge.us, label %for.body3.us
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for.body3.lr.ph.us: ; preds = %entry, %for.cond1.for.inc17_crit_edge.us
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%indvars.iv40 = phi i64 [ %indvars.iv.next41, %for.cond1.for.inc17_crit_edge.us ], [ 1, %entry ]
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%arrayidx.us = getelementptr inbounds float, float* %var2, i64 %indvars.iv40
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%arrayidx6.us = getelementptr inbounds float*, float** %var3, i64 %indvars.iv40
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%3 = load float*, float** %arrayidx6.us, align 8
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%.pre = load float, float* %arrayidx.us, align 4
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br label %for.body3.us
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for.cond1.for.inc17_crit_edge.us: ; preds = %for.body3.us
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%indvars.iv.next41 = add nuw nsw i64 %indvars.iv40, 1
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%lftr.wideiv42 = trunc i64 %indvars.iv.next41 to i32
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%exitcond43 = icmp eq i32 %lftr.wideiv42, %itr
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br i1 %exitcond43, label %for.end19, label %for.body3.lr.ph.us
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for.end19: ; preds = %for.cond1.for.inc17_crit_edge.us, %entry
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ret i32 0
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}
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