llvm-6502/test/Transforms/InstCombine/getelementptr.ll

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; The %A getelementptr instruction should be eliminated here
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | \
; RUN: grep -v %B | not grep getelementptr
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep foo1
; END.
@Global = constant [10 x i8] c"helloworld" ; <[10 x i8]*> [#uses=1]
; Test noop elimination
define i32* @foo1(i32* %I) {
%A = getelementptr i32* %I, i64 0 ; <i32*> [#uses=1]
ret i32* %A
}
; Test noop elimination
define i32* @foo2(i32* %I) {
%A = getelementptr i32* %I ; <i32*> [#uses=1]
ret i32* %A
}
; Test that two array indexing geps fold
define i32* @foo3(i32* %I) {
%A = getelementptr i32* %I, i64 17 ; <i32*> [#uses=1]
%B = getelementptr i32* %A, i64 4 ; <i32*> [#uses=1]
ret i32* %B
}
; Test that two getelementptr insts fold
define i32* @foo4({ i32 }* %I) {
%A = getelementptr { i32 }* %I, i64 1 ; <{ i32 }*> [#uses=1]
%B = getelementptr { i32 }* %A, i64 0, i32 0 ; <i32*> [#uses=1]
ret i32* %B
}
define void @foo5(i8 %B) {
; This should be turned into a constexpr instead of being an instruction
%A = getelementptr [10 x i8]* @Global, i64 0, i64 4 ; <i8*> [#uses=1]
store i8 %B, i8* %A
ret void
}
define i32* @foo6() {
%M = malloc [4 x i32] ; <[4 x i32]*> [#uses=1]
%A = getelementptr [4 x i32]* %M, i64 0, i64 0 ; <i32*> [#uses=1]
%B = getelementptr i32* %A, i64 2 ; <i32*> [#uses=1]
ret i32* %B
}
define i32* @foo7(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
}
define i8* @foo8([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
}
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
}
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
}
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
}