1 ; This tests for various complex cast elimination cases instcombine should
4 ; RUN: opt < %s -instcombine -S | FileCheck %s
6 define i1 @test1(i32 %X) {
7 %A = bitcast i32 %X to i32 ; <i32> [#uses=1]
8 ; Convert to setne int %X, 12
9 %c = icmp ne i32 %A, 12 ; <i1> [#uses=1]
11 ; CHECK: %c = icmp ne i32 %X, 12
15 define i1 @test2(i32 %X, i32 %Y) {
16 %A = bitcast i32 %X to i32 ; <i32> [#uses=1]
17 %B = bitcast i32 %Y to i32 ; <i32> [#uses=1]
18 ; Convert to setne int %X, %Y
19 %c = icmp ne i32 %A, %B ; <i1> [#uses=1]
21 ; CHECK: %c = icmp ne i32 %X, %Y
25 define i32 @test4(i32 %A) {
26 %B = bitcast i32 %A to i32 ; <i32> [#uses=1]
27 %C = shl i32 %B, 2 ; <i32> [#uses=1]
28 %D = bitcast i32 %C to i32 ; <i32> [#uses=1]
30 ; CHECK: %C = shl i32 %A, 2
34 define i16 @test5(i16 %A) {
35 %B = sext i16 %A to i32 ; <i32> [#uses=1]
36 %C = and i32 %B, 15 ; <i32> [#uses=1]
37 %D = trunc i32 %C to i16 ; <i16> [#uses=1]
39 ; CHECK: %C = and i16 %A, 15
43 define i1 @test6(i1 %A) {
44 %B = zext i1 %A to i32 ; <i32> [#uses=1]
45 %C = icmp ne i32 %B, 0 ; <i1> [#uses=1]
50 define i1 @test6a(i1 %A) {
51 %B = zext i1 %A to i32 ; <i32> [#uses=1]
52 %C = icmp ne i32 %B, -1 ; <i1> [#uses=1]
57 define i1 @test7(i8* %A) {
58 %B = bitcast i8* %A to i32* ; <i32*> [#uses=1]
59 %C = icmp eq i32* %B, null ; <i1> [#uses=1]
61 ; CHECK: %C = icmp eq i8* %A, null