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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | FileCheck %s
%pair = type { i32, i32 }
@Global = constant [10 x i8] c"helloworld"
; Test noop elimination
define i32* @test1(i32* %I) {
%A = getelementptr i32* %I, i64 0
ret i32* %A
; CHECK: @test1
; CHECK: ret i32* %I
}
; Test noop elimination
define i32* @test2(i32* %I) {
%A = getelementptr i32* %I
ret i32* %A
; CHECK: @test2
; CHECK: ret i32* %I
}
; Test that two array indexing geps fold
define i32* @test3(i32* %I) {
%A = getelementptr i32* %I, i64 17
%B = getelementptr i32* %A, i64 4
ret i32* %B
; CHECK: @test3
; CHECK: getelementptr i32* %I, i64 21
}
; Test that two getelementptr insts fold
define i32* @test4({ i32 }* %I) {
%A = getelementptr { i32 }* %I, i64 1
%B = getelementptr { i32 }* %A, i64 0, i32 0
ret i32* %B
; CHECK: @test4
; CHECK: getelementptr %0* %I, i64 1, i32 0
}
define void @test5(i8 %B) {
; This should be turned into a constexpr instead of being an instruction
%A = getelementptr [10 x i8]* @Global, i64 0, i64 4
store i8 %B, i8* %A
ret void
; CHECK: @test5
; CHECK: store i8 %B, i8* getelementptr inbounds ([10 x i8]* @Global, i64 0, i64 4)
}
define i32* @test6() {
%M = malloc [4 x i32]
%A = getelementptr [4 x i32]* %M, i64 0, i64 0
%B = getelementptr i32* %A, i64 2
ret i32* %B
; CHECK: @test6
; CHECK: getelementptr [4 x i32]* %M, i64 0, i64 2
}
define i32* @test7(i32* %I, i64 %C, i64 %D) {
%A = getelementptr i32* %I, i64 %C ; <i32*> [#uses=1]
%B = getelementptr i32* %A, i64 %D ; <i32*> [#uses=1]
ret i32* %B
; CHECK: @test7
; CHECK: %A.sum = add i64 %C, %D
; CHECK: getelementptr i32* %I, i64 %A.sum
}
define i8* @test8([10 x i32]* %X) {
;; Fold into the cast.
%A = getelementptr [10 x i32]* %X, i64 0, i64 0 ; <i32*> [#uses=1]
%B = bitcast i32* %A to i8* ; <i8*> [#uses=1]
ret i8* %B
; CHECK: @test8
; CHECK: bitcast [10 x i32]* %X to i8*
}
define i32 @test9() {
%A = getelementptr { i32, double }* null, i32 0, i32 1 ; <double*> [#uses=1]
%B = ptrtoint double* %A to i32 ; <i32> [#uses=1]
ret i32 %B
; CHECK: @test9
; CHECK: ret i32 8
}
define i1 @test10({ i32, i32 }* %x, { i32, i32 }* %y) {
%tmp.1 = getelementptr { i32, i32 }* %x, i32 0, i32 1 ; <i32*> [#uses=1]
%tmp.3 = getelementptr { i32, i32 }* %y, i32 0, i32 1 ; <i32*> [#uses=1]
;; seteq x, y
%tmp.4 = icmp eq i32* %tmp.1, %tmp.3 ; <i1> [#uses=1]
ret i1 %tmp.4
; CHECK: @test10
; CHECK: icmp eq %pair* %x, %y
}
define i1 @test11({ i32, i32 }* %X) {
%P = getelementptr { i32, i32 }* %X, i32 0, i32 0 ; <i32*> [#uses=1]
%Q = icmp eq i32* %P, null ; <i1> [#uses=1]
ret i1 %Q
; CHECK: @test11
; CHECK: icmp eq %pair* %X, null
}
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