llvm-mirror/test/Transforms/InstSimplify/cast.ll
2016-08-16 06:13:46 +00:00

55 lines
1.9 KiB
LLVM

; RUN: opt -S -instsimplify < %s | FileCheck %s
target datalayout = "p:32:32"
define i1 @test1(i1 %V) {
entry:
%Z = zext i1 %V to i32
%T = trunc i32 %Z to i1
ret i1 %T
; CHECK-LABEL: define i1 @test1(
; CHECK: ret i1 %V
}
define i8* @test2(i8* %V) {
entry:
%BC1 = bitcast i8* %V to i32*
%BC2 = bitcast i32* %BC1 to i8*
ret i8* %BC2
; CHECK-LABEL: define i8* @test2(
; CHECK: ret i8* %V
}
define i8* @test3(i8* %V) {
entry:
%BC = bitcast i8* %V to i8*
ret i8* %BC
; CHECK-LABEL: define i8* @test3(
; CHECK: ret i8* %V
}
define i32 @test4() {
; CHECK-LABEL: @test4(
%alloca = alloca i32, align 4 ; alloca + 0
%gep = getelementptr inbounds i32, i32* %alloca, i32 1 ; alloca + 4
%bc = bitcast i32* %gep to [4 x i8]* ; alloca + 4
%pti = ptrtoint i32* %alloca to i32 ; alloca
%sub = sub i32 0, %pti ; -alloca
%add = getelementptr [4 x i8], [4 x i8]* %bc, i32 0, i32 %sub ; alloca + 4 - alloca == 4
%add_to_int = ptrtoint i8* %add to i32 ; 4
ret i32 %add_to_int ; 4
; CHECK-NEXT: ret i32 4
}
define i32 @test5() {
; CHECK-LABEL: @test5(
%alloca = alloca i32, align 4 ; alloca + 0
%gep = getelementptr inbounds i32, i32* %alloca, i32 1 ; alloca + 4
%bc = bitcast i32* %gep to [4 x i8]* ; alloca + 4
%pti = ptrtoint i32* %alloca to i32 ; alloca
%sub = xor i32 %pti, -1 ; ~alloca
%add = getelementptr [4 x i8], [4 x i8]* %bc, i32 0, i32 %sub ; alloca + 4 - alloca - 1 == 3
%add_to_int = ptrtoint i8* %add to i32 ; 4
ret i32 %add_to_int ; 4
; CHECK-NEXT: ret i32 3
}