1 ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | FileCheck %s
3 %pair = type { i32, i32 }
4 @Global = constant [10 x i8] c"helloworld"
6 ; Test noop elimination
7 define i32* @test1(i32* %I) {
8 %A = getelementptr i32* %I, i64 0
14 ; Test noop elimination
15 define i32* @test2(i32* %I) {
16 %A = getelementptr i32* %I
22 ; Test that two array indexing geps fold
23 define i32* @test3(i32* %I) {
24 %A = getelementptr i32* %I, i64 17
25 %B = getelementptr i32* %A, i64 4
28 ; CHECK: getelementptr i32* %I, i64 21
31 ; Test that two getelementptr insts fold
32 define i32* @test4({ i32 }* %I) {
33 %A = getelementptr { i32 }* %I, i64 1
34 %B = getelementptr { i32 }* %A, i64 0, i32 0
37 ; CHECK: getelementptr %0* %I, i64 1, i32 0
40 define void @test5(i8 %B) {
41 ; This should be turned into a constexpr instead of being an instruction
42 %A = getelementptr [10 x i8]* @Global, i64 0, i64 4
46 ; CHECK: store i8 %B, i8* getelementptr inbounds ([10 x i8]* @Global, i64 0, i64 4)
49 define i32* @test6() {
51 %A = getelementptr [4 x i32]* %M, i64 0, i64 0
52 %B = getelementptr i32* %A, i64 2
55 ; CHECK: getelementptr [4 x i32]* %M, i64 0, i64 2
58 define i32* @test7(i32* %I, i64 %C, i64 %D) {
59 %A = getelementptr i32* %I, i64 %C ; <i32*> [#uses=1]
60 %B = getelementptr i32* %A, i64 %D ; <i32*> [#uses=1]
63 ; CHECK: %A.sum = add i64 %C, %D
64 ; CHECK: getelementptr i32* %I, i64 %A.sum
67 define i8* @test8([10 x i32]* %X) {
68 ;; Fold into the cast.
69 %A = getelementptr [10 x i32]* %X, i64 0, i64 0 ; <i32*> [#uses=1]
70 %B = bitcast i32* %A to i8* ; <i8*> [#uses=1]
73 ; CHECK: bitcast [10 x i32]* %X to i8*
77 %A = getelementptr { i32, double }* null, i32 0, i32 1 ; <double*> [#uses=1]
78 %B = ptrtoint double* %A to i32 ; <i32> [#uses=1]
84 define i1 @test10({ i32, i32 }* %x, { i32, i32 }* %y) {
85 %tmp.1 = getelementptr { i32, i32 }* %x, i32 0, i32 1 ; <i32*> [#uses=1]
86 %tmp.3 = getelementptr { i32, i32 }* %y, i32 0, i32 1 ; <i32*> [#uses=1]
88 %tmp.4 = icmp eq i32* %tmp.1, %tmp.3 ; <i1> [#uses=1]
91 ; CHECK: icmp eq %pair* %x, %y
94 define i1 @test11({ i32, i32 }* %X) {
95 %P = getelementptr { i32, i32 }* %X, i32 0, i32 0 ; <i32*> [#uses=1]
96 %Q = icmp eq i32* %P, null ; <i1> [#uses=1]
99 ; CHECK: icmp eq %pair* %X, null