1 ; RUN: opt %s -instcombine -S | grep {insertelement <4 x float> undef}
3 ; Instcombine should be able to prove that none of the
4 ; insertelement's first operand's elements are needed.
6 define internal void @""(i8*) {
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]
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
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]
31 ; <label>:16 ; preds = %7