1; RUN: opt < %s -instcombine -S | grep "insertelement <4 x float> undef"
2
3; Instcombine should be able to prove that none of the
4; insertelement's first operand's elements are needed.
5
6define internal void @""(i8*) {
7; <label>:1
8        bitcast i8* %0 to i32*          ; <i32*>:2 [#uses=1]
9        load i32* %2, align 1           ; <i32>:3 [#uses=1]
10        getelementptr i8* %0, i32 4             ; <i8*>:4 [#uses=1]
11        bitcast i8* %4 to i32*          ; <i32*>:5 [#uses=1]
12        load i32* %5, align 1           ; <i32>:6 [#uses=1]
13        br label %7
14
15; <label>:7             ; preds = %9, %1
16        %.01 = phi <4 x float> [ undef, %1 ], [ %12, %9 ]               ; <<4 x float>> [#uses=1]
17        %.0 = phi i32 [ %3, %1 ], [ %15, %9 ]           ; <i32> [#uses=3]
18        icmp slt i32 %.0, %6            ; <i1>:8 [#uses=1]
19        br i1 %8, label %9, label %16
20
21; <label>:9             ; preds = %7
22        sitofp i32 %.0 to float         ; <float>:10 [#uses=1]
23        insertelement <4 x float> %.01, float %10, i32 0                ; <<4 x float>>:11 [#uses=1]
24        shufflevector <4 x float> %11, <4 x float> undef, <4 x i32> zeroinitializer             ; <<4 x float>>:12 [#uses=2]
25        getelementptr i8* %0, i32 48            ; <i8*>:13 [#uses=1]
26        bitcast i8* %13 to <4 x float>*         ; <<4 x float>*>:14 [#uses=1]
27        store <4 x float> %12, <4 x float>* %14, align 16
28        add i32 %.0, 2          ; <i32>:15 [#uses=1]
29        br label %7
30
31; <label>:16            ; preds = %7
32        ret void
33}
34