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