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1; RUN: opt -S -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 < %s | FileCheck %s2 3target 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"4 5; We use to fail on this loop because we did not properly handle the loop6; invariant instruction anchored in the loop when used as a getelementptr index.7; We would use the index from the original loop resulting in a use not dominated8; by the definition.9 10; PR1645211 12; Verify that we don't miscompile this loop.13 14; CHECK-LABEL: @t(15; CHECK: <4 x i32>16 17define void @t(ptr %p) {18entry:19 br label %for.body20 21for.body:22 %indvars.iv17 = phi i64 [ %indvars.next, %for.body ], [ 128, %entry ]23 24 ; Loop invariant anchored in loop.25 %idxprom21 = zext i32 0 to i6426 27 %arrayidx23 = getelementptr inbounds [100 x [100 x i32]], ptr %p, i64 0, i64 %idxprom21, i64 %indvars.iv1728 store i32 poison, ptr %arrayidx23, align 429 %indvars.next= add i64 %indvars.iv17, -130 %0 = trunc i64 %indvars.next to i3231 %cmp15 = icmp ugt i32 %0, poison32 br i1 %cmp15, label %for.body, label %loopexit33 34loopexit:35 ret void36}37