| ; REQUIRES: asserts |
| ; RUN: opt -loop-vectorize -mtriple=arm64-apple-iphoneos -pass-remarks-analysis=loop-vectorize -debug-only=loop-vectorize -S < %s 2>&1 | FileCheck %s |
| |
| ; Specify a large unsafe vectorization factor of 32 that gets clamped to 16, |
| ; then test an even smaller VF of 2 is selected based on the cost-model. |
| |
| ; CHECK: LV: User VF=32 is unsafe, clamping to max safe VF=16. |
| ; CHECK: remark: <unknown>:0:0: User-specified vectorization factor 32 is unsafe, clamping to maximum safe vectorization factor 16 |
| ; CHECK: LV: Selecting VF: 2. |
| ; CHECK-LABEL: @test |
| ; CHECK: <2 x i64> |
| define void @test(i64* nocapture %a, i64* nocapture readonly %b) { |
| entry: |
| br label %loop.header |
| |
| loop.header: |
| %iv = phi i64 [ 0, %entry ], [ %iv.next, %latch ] |
| %arrayidx = getelementptr inbounds i64, i64* %a, i64 %iv |
| %0 = load i64, i64* %arrayidx, align 4 |
| %arrayidx2 = getelementptr inbounds i64, i64* %b, i64 %iv |
| %1 = load i64, i64* %arrayidx2, align 4 |
| %add = add nsw i64 %1, %0 |
| %2 = add nuw nsw i64 %iv, 16 |
| %arrayidx5 = getelementptr inbounds i64, i64* %a, i64 %2 |
| %c = icmp eq i64 %1, 120 |
| br i1 %c, label %then, label %latch |
| |
| then: |
| store i64 %add, i64* %arrayidx5, align 4 |
| br label %latch |
| |
| latch: |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %exitcond.not = icmp eq i64 %iv.next, 1024 |
| br i1 %exitcond.not, label %exit, label %loop.header, !llvm.loop !0 |
| |
| exit: |
| ret void |
| } |
| |
| !0 = !{!0, !1, !2} |
| !1 = !{!"llvm.loop.vectorize.width", i64 32} |
| !2 = !{!"llvm.loop.vectorize.enable", i1 true} |