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; REQUIRES: asserts
; RUN: opt -passes=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(ptr nocapture %a, ptr nocapture readonly %b) {
entry:
br label %loop.header
loop.header:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %latch ]
%arrayidx = getelementptr inbounds i64, ptr %a, i64 %iv
%0 = load i64, ptr %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i64, ptr %b, i64 %iv
%1 = load i64, ptr %arrayidx2, align 4
%add = add nsw i64 %1, %0
%2 = add nuw nsw i64 %iv, 16
%arrayidx5 = getelementptr inbounds i64, ptr %a, i64 %2
%c = icmp eq i64 %1, 120
br i1 %c, label %then, label %latch
then:
store i64 %add, ptr %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}
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