1; REQUIRES: asserts 2; RUN: opt -loop-vectorize -pass-remarks-analysis=loop-vectorize -debug-only=loop-vectorize -S < %s 2>&1 | FileCheck %s 3 4; Make sure the unsafe user specified vectorization factor is clamped. 5 6target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 7 8; void foo(int *a, int *b) { 9; #pragma clang loop vectorize(enable) vectorize_width(4) 10; for (int i=0; i < 1024; ++i) { 11; a[i + 2] = a[i] + b[i]; 12; } 13; } 14 15; CHECK: LV: User VF=4 is unsafe, clamping to max safe VF=2. 16; CHECK: remark: <unknown>:0:0: User-specified vectorization factor 4 is unsafe, clamping to maximum safe vectorization factor 2 17; CHECK-LABEL: @foo 18; CHECK: <2 x i32> 19define void @foo(i32* %a, i32* %b) { 20entry: 21 br label %loop.ph 22 23loop.ph: 24 br label %loop 25 26loop: 27 %iv = phi i64 [ 0, %loop.ph ], [ %iv.next, %loop ] 28 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %iv 29 %0 = load i32, i32* %arrayidx, align 4 30 %arrayidx2 = getelementptr inbounds i32, i32* %b, i64 %iv 31 %1 = load i32, i32* %arrayidx2, align 4 32 %add = add nsw i32 %1, %0 33 %2 = add nuw nsw i64 %iv, 2 34 %arrayidx5 = getelementptr inbounds i32, i32* %a, i64 %2 35 store i32 %add, i32* %arrayidx5, align 4 36 %iv.next = add nuw nsw i64 %iv, 1 37 %exitcond.not = icmp eq i64 %iv.next, 1024 38 br i1 %exitcond.not, label %exit, label %loop, !llvm.loop !0 39 40exit: 41 ret void 42} 43 44!0 = !{!0, !1, !2} 45!1 = !{!"llvm.loop.vectorize.width", i32 4} 46!2 = !{!"llvm.loop.vectorize.enable", i1 true} 47