| ; 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 |
| } |