; 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"
-; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep '%c' | not grep cast
+@inbuf = external global [32832 x i8] ; <[32832 x i8]*> [#uses=1]
-%inbuf = external global [32832 x ubyte]
+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
+}
-implementation
+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
+}
-int %test1(int %A) {
- %c1 = cast int %A to uint
- %c2 = cast uint %c1 to int
- ret int %c2
+; 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
}
-ulong %test2(ubyte %A) {
- %c1 = cast ubyte %A to ushort
- %c2 = cast ushort %c1 to uint
- %Ret = cast uint %c2 to ulong
- ret ulong %Ret
+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
}
-ulong %test3(ulong %A) { ; This function should just use bitwise AND
- %c1 = cast ulong %A to ubyte
- %c2 = cast ubyte %c1 to ulong
- ret ulong %c2
+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
}
-uint %test4(int %A, int %B) {
- %COND = setlt int %A, %B
- %c = cast bool %COND to ubyte ; Booleans are unsigned integrals
- %result = cast ubyte %c to uint ; for the cast elim purpose
- ret uint %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: %res = trunc i64 %A to i32
+; CHECK: ret i32 %res
}
-int %test5(bool %B) {
- %c = cast bool %B to ubyte ; This cast should get folded into
- %result = cast ubyte %c to int ; this cast
- ret int %result
+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
}
-int %test6(ulong %A) {
- %c1 = cast ulong %A to uint
- %res = cast uint %c1 to int
- ret int %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: %res = sext i8 %A to i64
+; CHECK: ret i64 %res
}
-long %test7(bool %A) {
- %c1 = cast bool %A to int
- %res = cast int %c1 to long
- ret long %res
+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
}
-long %test8(sbyte %A) {
- %c1 = cast sbyte %A to ulong
- %res = cast ulong %c1 to long
- ret long %res
+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
}
-short %test9(short %A) {
- %c1 = cast short %A to int
- %c2 = cast int %c1 to short
- ret short %c2
+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
}
-short %test10(short %A) {
- %c1 = cast short %A to uint
- %c2 = cast uint %c1 to short
- ret short %c2
+define i32* @test12() {
+ %p = malloc [4 x i8] ; <[4 x i8]*> [#uses=1]
+ %c = bitcast [4 x i8]* %p to i32* ; <i32*> [#uses=1]
+ ret i32* %c
+; CHECK: %malloccall = tail call i8* @malloc(i32 4)
+; CHECK: ret i32* %c
}
-declare void %varargs(int, ...)
+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
+}
-void %test11(int* %P) {
- %c = cast int* %P to short*
- call void(int, ...)* %varargs(int 5, short* %c)
- ret void
+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
}
-int* %test12() {
- %p = malloc [4 x sbyte]
- %c = cast [4 x sbyte]* %p to int*
- ret int* %c
+
+; 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
}
-ubyte *%test13(long %A) {
- %c = getelementptr [0 x ubyte]* cast ([32832 x ubyte]* %inbuf to [0 x ubyte]*), long 0, long %A
- ret ubyte* %c
+define i16 @test17(i1 %tmp3) {
+ %c = zext i1 %tmp3 to i32 ; <i32> [#uses=1]
+ %t86 = trunc i32 %c to i16 ; <i16> [#uses=1]
+ ret i16 %t86
+; CHECK: %t86 = zext i1 %tmp3 to i16
+; CHECK: ret i16 %t86
}
-bool %test14(sbyte %A) {
- %c = cast sbyte %A to ubyte
- %X = setlt ubyte %c, 128 ; setge %A, 0
- ret bool %X
+define i16 @test18(i8 %tmp3) {
+ %c = sext i8 %tmp3 to i32 ; <i32> [#uses=1]
+ %t86 = trunc i32 %c to i16 ; <i16> [#uses=1]
+ ret i16 %t86
+; CHECK: %t86 = sext i8 %tmp3 to i16
+; CHECK: ret i16 %t86
}
-bool %test15(ubyte %A) {
- %c = cast ubyte %A to sbyte
- %X = setlt sbyte %c, 0 ; setgt %A, 127
- ret bool %X
+define i1 @test19(i32 %X) {
+ %c = sext i32 %X to i64 ; <i64> [#uses=1]
+ %Z = icmp slt i64 %c, 12345 ; <i1> [#uses=1]
+ ret i1 %Z
+; CHECK: %Z = icmp slt i32 %X, 12345
+; CHECK: ret i1 %Z
}
-bool %test16(int* %P) {
- %c = cast int* %P to bool ;; setne P, null
- ret bool %c
+define i1 @test20(i1 %B) {
+ %c = zext i1 %B to i32 ; <i32> [#uses=1]
+ %D = icmp slt i32 %c, -1 ; <i1> [#uses=1]
+ ;; false
+ ret i1 %D
+; CHECK: ret i1 false
}
+define i32 @test21(i32 %X) {
+ %c1 = trunc i32 %X to i8 ; <i8> [#uses=1]
+ ;; sext -> zext -> and -> nop
+ %c2 = sext i8 %c1 to i32 ; <i32> [#uses=1]
+ %RV = and i32 %c2, 255 ; <i32> [#uses=1]
+ ret i32 %RV
+; CHECK: %c21 = and i32 %X, 255
+; CHECK: ret i32 %c21
+}
-short %test17(bool %tmp3) {
- %c = cast bool %tmp3 to int
- %t86 = cast int %c to short
- ret short %t86
+define i32 @test22(i32 %X) {
+ %c1 = trunc i32 %X to i8 ; <i8> [#uses=1]
+ ;; sext -> zext -> and -> nop
+ %c2 = sext i8 %c1 to i32 ; <i32> [#uses=1]
+ %RV = shl i32 %c2, 24 ; <i32> [#uses=1]
+ ret i32 %RV
+; CHECK: %RV = shl i32 %X, 24
+; CHECK: ret i32 %RV
}
-short %test18(sbyte %tmp3) {
- %c = cast sbyte %tmp3 to int
- %t86 = cast int %c to short
- ret short %t86
+define i32 @test23(i32 %X) {
+ ;; Turn into an AND even though X
+ %c1 = trunc i32 %X to i16 ; <i16> [#uses=1]
+ ;; and Z are signed.
+ %c2 = zext i16 %c1 to i32 ; <i32> [#uses=1]
+ ret i32 %c2
+; CHECK: %c2 = and i32 %X, 65535
+; CHECK: ret i32 %c2
}
-bool %test19(int %X) {
- %c = cast int %X to long
- %Z = setlt long %c, 12345
- ret bool %Z
+define i1 @test24(i1 %C) {
+ %X = select i1 %C, i32 14, i32 1234 ; <i32> [#uses=1]
+ ;; Fold cast into select
+ %c = icmp ne i32 %X, 0 ; <i1> [#uses=1]
+ ret i1 %c
+; CHECK: ret i1 true
}
-bool %test20(bool %B) {
- %c = cast bool %B to int
- %D = setlt int %c, -1
- ret bool %D ;; false
+define void @test25(i32** %P) {
+ %c = bitcast i32** %P to float** ; <float**> [#uses=1]
+ ;; Fold cast into null
+ store float* null, float** %c
+ ret void
+; CHECK: store i32* null, i32** %P
+; CHECK: ret void
}
-uint %test21(uint %X) {
- %c1 = cast uint %X to sbyte
- %c2 = cast sbyte %c1 to uint ;; sext -> zext -> and -> nop
- %RV = and uint %c2, 255
- ret uint %RV
+define i32 @test26(float %F) {
+ ;; no need to cast from float->double.
+ %c = fpext float %F to double ; <double> [#uses=1]
+ %D = fptosi double %c to i32 ; <i32> [#uses=1]
+ ret i32 %D
+; CHECK: %D = fptosi float %F to i32
+; CHECK: ret i32 %D
}
-uint %test22(uint %X) {
- %c1 = cast uint %X to sbyte
- %c2 = cast sbyte %c1 to uint ;; sext -> zext -> and -> nop
- %RV = shl uint %c2, ubyte 24
- ret uint %RV
+define [4 x float]* @test27([9 x [4 x float]]* %A) {
+ %c = bitcast [9 x [4 x float]]* %A to [4 x float]* ; <[4 x float]*> [#uses=1]
+ ret [4 x float]* %c
+; CHECK: %c = getelementptr inbounds [9 x [4 x float]]* %A, i64 0, i64 0
+; CHECK: ret [4 x float]* %c
}
-int %test23(int %X) {
- %c1 = cast int %X to ushort ;; Turn into an AND even though X
- %c2 = cast ushort %c1 to int ;; and Z are signed.
- ret int %c2
+define float* @test28([4 x float]* %A) {
+ %c = bitcast [4 x float]* %A to float* ; <float*> [#uses=1]
+ ret float* %c
+; CHECK: %c = getelementptr inbounds [4 x float]* %A, i64 0, i64 0
+; CHECK: ret float* %c
}
-bool %test24(bool %C) {
- %X = select bool %C, uint 14, uint 1234
- %c = cast uint %X to bool ;; Fold cast into select
- ret bool %c
+define i32 @test29(i32 %c1, i32 %c2) {
+ %tmp1 = trunc i32 %c1 to i8 ; <i8> [#uses=1]
+ %tmp4.mask = trunc i32 %c2 to i8 ; <i8> [#uses=1]
+ %tmp = or i8 %tmp4.mask, %tmp1 ; <i8> [#uses=1]
+ %tmp10 = zext i8 %tmp to i32 ; <i32> [#uses=1]
+ ret i32 %tmp10
+; CHECK: %tmp2 = or i32 %c2, %c1
+; CHECK: %tmp10 = and i32 %tmp2, 255
+; CHECK: ret i32 %tmp10
}
-void %test25(int** %P) {
- %c = cast int** %P to float**
- store float* null, float** %c ;; Fold cast into null
+define i32 @test30(i32 %c1) {
+ %c2 = trunc i32 %c1 to i8 ; <i8> [#uses=1]
+ %c3 = xor i8 %c2, 1 ; <i8> [#uses=1]
+ %c4 = zext i8 %c3 to i32 ; <i32> [#uses=1]
+ ret i32 %c4
+; CHECK: %c3 = and i32 %c1, 255
+; CHECK: %c4 = xor i32 %c3, 1
+; CHECK: ret i32 %c4
+}
+
+define i1 @test31(i64 %A) {
+ %B = trunc i64 %A to i32 ; <i32> [#uses=1]
+ %C = and i32 %B, 42 ; <i32> [#uses=1]
+ %D = icmp eq i32 %C, 10 ; <i1> [#uses=1]
+ ret i1 %D
+; CHECK: %C1 = and i64 %A, 42
+; CHECK: %D = icmp eq i64 %C1, 10
+; CHECK: ret i1 %D
+}
+
+define void @test32(double** %tmp) {
+ %tmp8 = malloc [16 x i8] ; <[16 x i8]*> [#uses=1]
+ %tmp8.upgrd.1 = bitcast [16 x i8]* %tmp8 to double* ; <double*> [#uses=1]
+ store double* %tmp8.upgrd.1, double** %tmp
ret void
+; CHECK: %malloccall = tail call i8* @malloc(i32 16)
+; CHECK: %tmp8.upgrd.1 = bitcast i8* %malloccall to double*
+; CHECK: store double* %tmp8.upgrd.1, double** %tmp
+; CHECK: ret void
+}
+
+define i32 @test33(i32 %c1) {
+ %x = bitcast i32 %c1 to float ; <float> [#uses=1]
+ %y = bitcast float %x to i32 ; <i32> [#uses=1]
+ ret i32 %y
+; CHECK: ret i32 %c1
+}
+
+define i16 @test34(i16 %a) {
+ %c1 = zext i16 %a to i32 ; <i32> [#uses=1]
+ %tmp21 = lshr i32 %c1, 8 ; <i32> [#uses=1]
+ %c2 = trunc i32 %tmp21 to i16 ; <i16> [#uses=1]
+ ret i16 %c2
+; CHECK: %tmp21 = lshr i16 %a, 8
+; CHECK: ret i16 %tmp21
+}
+
+define i16 @test35(i16 %a) {
+ %c1 = bitcast i16 %a to i16 ; <i16> [#uses=1]
+ %tmp2 = lshr i16 %c1, 8 ; <i16> [#uses=1]
+ %c2 = bitcast i16 %tmp2 to i16 ; <i16> [#uses=1]
+ ret i16 %c2
+; CHECK: %tmp2 = lshr i16 %a, 8
+; CHECK: ret i16 %tmp2
+}
+
+; icmp sgt i32 %a, -1
+; rdar://6480391
+define i1 @test36(i32 %a) {
+ %b = lshr i32 %a, 31
+ %c = trunc i32 %b to i8
+ %d = icmp eq i8 %c, 0
+ ret i1 %d
+; CHECK: %d = icmp sgt i32 %a, -1
+; CHECK: ret i1 %d
+}
+
+; ret i1 false
+define i1 @test37(i32 %a) {
+ %b = lshr i32 %a, 31
+ %c = or i32 %b, 512
+ %d = trunc i32 %c to i8
+ %e = icmp eq i8 %d, 11
+ ret i1 %e
+; CHECK: ret i1 false
+}
+
+define i64 @test38(i32 %a) {
+ %1 = icmp eq i32 %a, -2
+ %2 = zext i1 %1 to i8
+ %3 = xor i8 %2, 1
+ %4 = zext i8 %3 to i64
+ ret i64 %4
+; CHECK: %1 = icmp ne i32 %a, -2
+; CHECK: %2 = zext i1 %1 to i64
+; CHECK: ret i64 %2
+}
+
+define i16 @test39(i16 %a) {
+ %tmp = zext i16 %a to i32
+ %tmp21 = lshr i32 %tmp, 8
+ %tmp5 = shl i32 %tmp, 8
+ %tmp.upgrd.32 = or i32 %tmp21, %tmp5
+ %tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16
+ ret i16 %tmp.upgrd.3
+; CHECK: @test39
+; CHECK: %tmp.upgrd.32 = call i16 @llvm.bswap.i16(i16 %a)
+; CHECK: ret i16 %tmp.upgrd.32
+}
+
+define i16 @test40(i16 %a) {
+ %tmp = zext i16 %a to i32
+ %tmp21 = lshr i32 %tmp, 9
+ %tmp5 = shl i32 %tmp, 8
+ %tmp.upgrd.32 = or i32 %tmp21, %tmp5
+ %tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16
+ ret i16 %tmp.upgrd.3
+; CHECK: @test40
+; CHECK: %tmp21 = lshr i16 %a, 9
+; CHECK: %tmp5 = shl i16 %a, 8
+; CHECK: %tmp.upgrd.32 = or i16 %tmp21, %tmp5
+; CHECK: ret i16 %tmp.upgrd.32
+}
+
+; PR1263
+define i32* @test41(i32* %tmp1) {
+ %tmp64 = bitcast i32* %tmp1 to { i32 }*
+ %tmp65 = getelementptr { i32 }* %tmp64, i32 0, i32 0
+ ret i32* %tmp65
+; CHECK: @test41
+; CHECK: ret i32* %tmp1
+}
+
+define i32 @test42(i32 %X) {
+ %Y = trunc i32 %X to i8 ; <i8> [#uses=1]
+ %Z = zext i8 %Y to i32 ; <i32> [#uses=1]
+ ret i32 %Z
+; CHECK: @test42
+; CHECK: %Z = and i32 %X, 255
}
projects / oota-llvm.git / blobdiff