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34 lines
1.3 KiB
34 lines
1.3 KiB
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 -prefetch-distance=100 \
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; RUN: -stop-after=loop-data-prefetch | FileCheck %s -check-prefix=FAR-PREFETCH
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 -prefetch-distance=20 \
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; RUN: -stop-after=loop-data-prefetch | FileCheck %s -check-prefix=NEAR-PREFETCH
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;
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; Check that prefetches are not emitted when the known constant trip count of
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; the loop is smaller than the estimated "iterations ahead" of the prefetch.
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;
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; FAR-PREFETCH-LABEL: fun
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; FAR-PREFETCH-NOT: call void @llvm.prefetch
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; NEAR-PREFETCH-LABEL: fun
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; NEAR-PREFETCH: call void @llvm.prefetch
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define void @fun(i32* nocapture %Src, i32* nocapture readonly %Dst) {
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entry:
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br label %for.body
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for.cond.cleanup: ; preds = %for.body
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ret void
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next.9, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %Dst, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %Src, i64 %indvars.iv
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store i32 %0, i32* %arrayidx2, align 4
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%indvars.iv.next.9 = add nuw nsw i64 %indvars.iv, 1600
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%cmp.9 = icmp ult i64 %indvars.iv.next.9, 11200
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br i1 %cmp.9, label %for.body, label %for.cond.cleanup
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}
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