path: root/test/Transforms/InstCombine/cast.ll

; Tests to make sure elimination of casts is working correctly
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64"

@inbuf = external global [32832 x i8]           ; <[32832 x i8]*> [#uses=1]

define i32 @test1(i32 %A) {
        %c1 = bitcast i32 %A to i32             ; <i32> [#uses=1]
        %c2 = bitcast i32 %c1 to i32            ; <i32> [#uses=1]
        ret i32 %c2
; CHECK: ret i32 %A
}

define i64 @test2(i8 %A) {
        %c1 = zext i8 %A to i16         ; <i16> [#uses=1]
        %c2 = zext i16 %c1 to i32               ; <i32> [#uses=1]
        %Ret = zext i32 %c2 to i64              ; <i64> [#uses=1]
        ret i64 %Ret
; CHECK: %Ret = zext i8 %A to i64
; CHECK: ret i64 %Ret
}

; This function should just use bitwise AND
define i64 @test3(i64 %A) {
        %c1 = trunc i64 %A to i8                ; <i8> [#uses=1]
        %c2 = zext i8 %c1 to i64                ; <i64> [#uses=1]
        ret i64 %c2
; CHECK: %c2 = and i64 %A, 255
; CHECK: ret i64 %c2
}

define i32 @test4(i32 %A, i32 %B) {
        %COND = icmp slt i32 %A, %B             ; <i1> [#uses=1]
        ; Booleans are unsigned integrals
        %c = zext i1 %COND to i8                ; <i8> [#uses=1]
        ; for the cast elim purpose
        %result = zext i8 %c to i32             ; <i32> [#uses=1]
        ret i32 %result
; CHECK: %COND = icmp slt i32 %A, %B
; CHECK: %result = zext i1 %COND to i32
; CHECK: ret i32 %result
}

define i32 @test5(i1 %B) {
        ; This cast should get folded into
        %c = zext i1 %B to i8           ; <i8> [#uses=1]
        ; this cast        
        %result = zext i8 %c to i32             ; <i32> [#uses=1]
        ret i32 %result
; CHECK: %result = zext i1 %B to i32
; CHECK: ret i32 %result
}

define i32 @test6(i64 %A) {
        %c1 = trunc i64 %A to i32               ; <i32> [#uses=1]
        %res = bitcast i32 %c1 to i32           ; <i32> [#uses=1]
        ret i32 %res
; CHECK:  trunc i64 %A to i32
; CHECK-NEXT: ret i32
}

define i64 @test7(i1 %A) {
        %c1 = zext i1 %A to i32         ; <i32> [#uses=1]
        %res = sext i32 %c1 to i64              ; <i64> [#uses=1]
        ret i64 %res
; CHECK: %res = zext i1 %A to i64
; CHECK: ret i64 %res
}

define i64 @test8(i8 %A) {
        %c1 = sext i8 %A to i64         ; <i64> [#uses=1]
        %res = bitcast i64 %c1 to i64           ; <i64> [#uses=1]
        ret i64 %res
; CHECK: = sext i8 %A to i64
; CHECK-NEXT: ret i64
}

define i16 @test9(i16 %A) {
        %c1 = sext i16 %A to i32                ; <i32> [#uses=1]
        %c2 = trunc i32 %c1 to i16              ; <i16> [#uses=1]
        ret i16 %c2
; CHECK: ret i16 %A
}

define i16 @test10(i16 %A) {
        %c1 = sext i16 %A to i32                ; <i32> [#uses=1]
        %c2 = trunc i32 %c1 to i16              ; <i16> [#uses=1]
        ret i16 %c2
; CHECK: ret i16 %A
}

declare void @varargs(i32, ...)

define void @test11(i32* %P) {
        %c = bitcast i32* %P to i16*            ; <i16*> [#uses=1]
        call void (i32, ...)* @varargs( i32 5, i16* %c )
        ret void
; CHECK: call void (i32, ...)* @varargs(i32 5, i32* %P)
; CHECK: ret void
}

define i8* @test13(i64 %A) {
        %c = getelementptr [0 x i8]* bitcast ([32832 x i8]* @inbuf to [0 x i8]*), i64 0, i64 %A             ; <i8*> [#uses=1]
        ret i8* %c
; CHECK: %c = getelementptr [32832 x i8]* @inbuf, i64 0, i64 %A
; CHECK: ret i8* %c
}

define i1 @test14(i8 %A) {
        %c = bitcast i8 %A to i8                ; <i8> [#uses=1]
        %X = icmp ult i8 %c, -128               ; <i1> [#uses=1]
        ret i1 %X
; CHECK: %X = icmp sgt i8 %A, -1
; CHECK: ret i1 %X
}


; This just won't occur when there's no difference between ubyte and sbyte
;bool %test15(ubyte %A) {
;        %c = cast ubyte %A to sbyte
;        %X = setlt sbyte %c, 0   ; setgt %A, 127
;        ret bool %X
;}

define i1 @test16(i32* %P) {
        %c = icmp ne i32* %P, null              ; <i1> [#uses=1]
        ret i1 %c
; CHECK: %c = icmp ne i32* %P, null
; CHECK: ret i1 %c
}

define i16 @test17(i1 %tmp3) {
        %c = zext i1 %tmp3 to i32               ; <i32> [#uses=1]
        %t86 = trunc i32 %c