1; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 -prefetch-distance=100 \ 2; RUN: -stop-after=loop-data-prefetch | FileCheck %s -check-prefix=FAR-PREFETCH 3; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 -prefetch-distance=20 \ 4; RUN: -stop-after=loop-data-prefetch | FileCheck %s -check-prefix=NEAR-PREFETCH 5; 6; Check that prefetches are not emitted when the known constant trip count of 7; the loop is smaller than the estimated "iterations ahead" of the prefetch. 8; 9; FAR-PREFETCH-LABEL: fun 10; FAR-PREFETCH-NOT: call void @llvm.prefetch 11 12; NEAR-PREFETCH-LABEL: fun 13; NEAR-PREFETCH: call void @llvm.prefetch 14 15 16define void @fun(i32* nocapture %Src, i32* nocapture readonly %Dst) { 17entry: 18 br label %for.body 19 20for.cond.cleanup: ; preds = %for.body 21 ret void 22 23for.body: ; preds = %for.body, %entry 24 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next.9, %for.body ] 25 %arrayidx = getelementptr inbounds i32, i32* %Dst, i64 %indvars.iv 26 %0 = load i32, i32* %arrayidx, align 4 27 %arrayidx2 = getelementptr inbounds i32, i32* %Src, i64 %indvars.iv 28 store i32 %0, i32* %arrayidx2, align 4 29 %indvars.iv.next.9 = add nuw nsw i64 %indvars.iv, 1600 30 %cmp.9 = icmp ult i64 %indvars.iv.next.9, 11200 31 br i1 %cmp.9, label %for.body, label %for.cond.cleanup 32} 33 34