29 lines
946 B
LLVM
29 lines
946 B
LLVM
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 -prefetch-distance=20 \
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; RUN: -loop-prefetch-writes -stop-after=loop-data-prefetch | FileCheck %s
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;
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; Check that for a load followed by a store to the same address gets a single
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; write prefetch.
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;
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; CHECK-LABEL: for.body
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; CHECK: call void @llvm.prefetch.p0i8(i8* %scevgep{{.*}}, i32 1, i32 3, i32 1
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; CHECK-not: 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.body:
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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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%a = add i32 %0, 128
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store i32 %a, i32* %arrayidx, 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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for.cond.cleanup:
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ret void
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}
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