-; This test makes sure that these instructions are properly eliminated.
+target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
+
+; Optimize subtracts.
;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define i32 @test1(i32 %A) {
+ %B = sub i32 %A, %A
+ ret i32 %B
+; CHECK-LABEL: @test1(
+; CHECK: ret i32 0
+}
+
+define i32 @test2(i32 %A) {
+ %B = sub i32 %A, 0
+ ret i32 %B
+; CHECK-LABEL: @test2(
+; CHECK: ret i32 %A
+}
+
+define i32 @test3(i32 %A) {
+ %B = sub i32 0, %A
+ %C = sub i32 0, %B
+ ret i32 %C
+; CHECK-LABEL: @test3(
+; CHECK: ret i32 %A
+}
+
+define i32 @test4(i32 %A, i32 %x) {
+ %B = sub i32 0, %A
+ %C = sub i32 %x, %B
+ ret i32 %C
+; CHECK-LABEL: @test4(
+; CHECK: %C = add i32 %x, %A
+; CHECK: ret i32 %C
+}
+
+define i32 @test5(i32 %A, i32 %B, i32 %C) {
+ %D = sub i32 %B, %C
+ %E = sub i32 %A, %D
+ ret i32 %E
+; CHECK-LABEL: @test5(
+; CHECK: %D1 = sub i32 %C, %B
+; CHECK: %E = add
+; CHECK: ret i32 %E
+}
+
+define i32 @test6(i32 %A, i32 %B) {
+ %C = and i32 %A, %B
+ %D = sub i32 %A, %C
+ ret i32 %D
+; CHECK-LABEL: @test6(
+; CHECK-NEXT: xor i32 %B, -1
+; CHECK-NEXT: %D = and i32
+; CHECK-NEXT: ret i32 %D
+}
+
+define i32 @test7(i32 %A) {
+ %B = sub i32 -1, %A
+ ret i32 %B
+; CHECK-LABEL: @test7(
+; CHECK: %B = xor i32 %A, -1
+; CHECK: ret i32 %B
+}
+
+define i32 @test8(i32 %A) {
+ %B = mul i32 9, %A
+ %C = sub i32 %B, %A
+ ret i32 %C
+; CHECK-LABEL: @test8(
+; CHECK: %C = shl i32 %A, 3
+; CHECK: ret i32 %C
+}
+
+define i32 @test9(i32 %A) {
+ %B = mul i32 3, %A
+ %C = sub i32 %A, %B
+ ret i32 %C
+; CHECK-LABEL: @test9(
+; CHECK: %C = mul i32 %A, -2
+; CHECK: ret i32 %C
+}
+
+define i32 @test10(i32 %A, i32 %B) {
+ %C = sub i32 0, %A
+ %D = sub i32 0, %B
+ %E = mul i32 %C, %D
+ ret i32 %E
+; CHECK-LABEL: @test10(
+; CHECK: %E = mul i32 %A, %B
+; CHECK: ret i32 %E
+}
+
+define i32 @test10a(i32 %A) {
+ %C = sub i32 0, %A
+ %E = mul i32 %C, 7
+ ret i32 %E
+; CHECK-LABEL: @test10a(
+; CHECK: %E = mul i32 %A, -7
+; CHECK: ret i32 %E
+}
+
+define i1 @test11(i8 %A, i8 %B) {
+ %C = sub i8 %A, %B
+ %cD = icmp ne i8 %C, 0
+ ret i1 %cD
+; CHECK-LABEL: @test11(
+; CHECK: %cD = icmp ne i8 %A, %B
+; CHECK: ret i1 %cD
+}
+
+define i32 @test12(i32 %A) {
+ %B = ashr i32 %A, 31
+ %C = sub i32 0, %B
+ ret i32 %C
+; CHECK-LABEL: @test12(
+; CHECK: %C = lshr i32 %A, 31
+; CHECK: ret i32 %C
+}
+
+define i32 @test13(i32 %A) {
+ %B = lshr i32 %A, 31
+ %C = sub i32 0, %B
+ ret i32 %C
+; CHECK-LABEL: @test13(
+; CHECK: %C = ashr i32 %A, 31
+; CHECK: ret i32 %C
+}
+
+define i32 @test14(i32 %A) {
+ %B = lshr i32 %A, 31
+ %C = bitcast i32 %B to i32
+ %D = sub i32 0, %C
+ ret i32 %D
+; CHECK-LABEL: @test14(
+; CHECK: %D = ashr i32 %A, 31
+; CHECK: ret i32 %D
+}
+
+define i32 @test15(i32 %A, i32 %B) {
+ %C = sub i32 0, %A
+ %D = srem i32 %B, %C
+ ret i32 %D
+; CHECK-LABEL: @test15(
+; CHECK: %[[sub:.*]] = sub i32 0, %A
+; CHECK-NEXT: %[[rem:.*]] = srem i32 %B, %[[sub]]
+; CHECK: ret i32 %[[rem]]
+}
+
+define i32 @test16(i32 %A) {
+ %X = sdiv i32 %A, 1123
+ %Y = sub i32 0, %X
+ ret i32 %Y
+; CHECK-LABEL: @test16(
+; CHECK: %Y = sdiv i32 %A, -1123
+; CHECK: ret i32 %Y
+}
+
+; Can't fold subtract here because negation it might oveflow.
+; PR3142
+define i32 @test17(i32 %A) {
+ %B = sub i32 0, %A
+ %C = sdiv i32 %B, 1234
+ ret i32 %C
+; CHECK-LABEL: @test17(
+; CHECK: %B = sub i32 0, %A
+; CHECK: %C = sdiv i32 %B, 1234
+; CHECK: ret i32 %C
+}
+
+define i64 @test18(i64 %Y) {
+ %tmp.4 = shl i64 %Y, 2
+ %tmp.12 = shl i64 %Y, 2
+ %tmp.8 = sub i64 %tmp.4, %tmp.12
+ ret i64 %tmp.8
+; CHECK-LABEL: @test18(
+; CHECK: ret i64 0
+}
+
+define i32 @test19(i32 %X, i32 %Y) {
+ %Z = sub i32 %X, %Y
+ %Q = add i32 %Z, %Y
+ ret i32 %Q
+; CHECK-LABEL: @test19(
+; CHECK: ret i32 %X
+}
+
+define i1 @test20(i32 %g, i32 %h) {
+ %tmp.2 = sub i32 %g, %h
+ %tmp.4 = icmp ne i32 %tmp.2, %g
+ ret i1 %tmp.4
+; CHECK-LABEL: @test20(
+; CHECK: %tmp.4 = icmp ne i32 %h, 0
+; CHECK: ret i1 %tmp.4
+}
+
+define i1 @test21(i32 %g, i32 %h) {
+ %tmp.2 = sub i32 %g, %h
+ %tmp.4 = icmp ne i32 %tmp.2, %g
+ ret i1 %tmp.4
+; CHECK-LABEL: @test21(
+; CHECK: %tmp.4 = icmp ne i32 %h, 0
+; CHECK: ret i1 %tmp.4
+}
+
+; PR2298
+define zeroext i1 @test22(i32 %a, i32 %b) nounwind {
+ %tmp2 = sub i32 0, %a
+ %tmp4 = sub i32 0, %b
+ %tmp5 = icmp eq i32 %tmp2, %tmp4
+ ret i1 %tmp5
+; CHECK-LABEL: @test22(
+; CHECK: %tmp5 = icmp eq i32 %b, %a
+; CHECK: ret i1 %tmp5
+}
+
+; rdar://7362831
+define i32 @test23(i8* %P, i64 %A){
+ %B = getelementptr inbounds i8* %P, i64 %A
+ %C = ptrtoint i8* %B to i64
+ %D = trunc i64 %C to i32
+ %E = ptrtoint i8* %P to i64
+ %F = trunc i64 %E to i32
+ %G = sub i32 %D, %F
+ ret i32 %G
+; CHECK-LABEL: @test23(
+; CHECK-NEXT: = trunc i64 %A to i32
+; CHECK-NEXT: ret i32
+}
+
+define i8 @test23_as1(i8 addrspace(1)* %P, i16 %A) {
+; CHECK: @test23_as1
+; CHECK-NEXT: = trunc i16 %A to i8
+; CHECK-NEXT: ret i8
+ %B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A
+ %C = ptrtoint i8 addrspace(1)* %B to i16
+ %D = trunc i16 %C to i8
+ %E = ptrtoint i8 addrspace(1)* %P to i16
+ %F = trunc i16 %E to i8
+ %G = sub i8 %D, %F
+ ret i8 %G
+}
+
+define i64 @test24(i8* %P, i64 %A){
+ %B = getelementptr inbounds i8* %P, i64 %A
+ %C = ptrtoint i8* %B to i64
+ %E = ptrtoint i8* %P to i64
+ %G = sub i64 %C, %E
+ ret i64 %G
+; CHECK-LABEL: @test24(
+; CHECK-NEXT: ret i64 %A
+}
+
+define i16 @test24_as1(i8 addrspace(1)* %P, i16 %A) {
+; CHECK: @test24_as1
+; CHECK-NEXT: ret i16 %A
+ %B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A
+ %C = ptrtoint i8 addrspace(1)* %B to i16
+ %E = ptrtoint i8 addrspace(1)* %P to i16
+ %G = sub i16 %C, %E
+ ret i16 %G
+}
+
+define i64 @test24a(i8* %P, i64 %A){
+ %B = getelementptr inbounds i8* %P, i64 %A
+ %C = ptrtoint i8* %B to i64
+ %E = ptrtoint i8* %P to i64
+ %G = sub i64 %E, %C
+ ret i64 %G
+; CHECK-LABEL: @test24a(
+; CHECK-NEXT: sub i64 0, %A
+; CHECK-NEXT: ret i64
+}
+
+define i16 @test24a_as1(i8 addrspace(1)* %P, i16 %A) {
+; CHECK: @test24a_as1
+; CHECK-NEXT: sub i16 0, %A
+; CHECK-NEXT: ret i16
+ %B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A
+ %C = ptrtoint i8 addrspace(1)* %B to i16
+ %E = ptrtoint i8 addrspace(1)* %P to i16
+ %G = sub i16 %E, %C
+ ret i16 %G
+}
+
+
+@Arr = external global [42 x i16]
+
+define i64 @test24b(i8* %P, i64 %A){
+ %B = getelementptr inbounds [42 x i16]* @Arr, i64 0, i64 %A
+ %C = ptrtoint i16* %B to i64
+ %G = sub i64 %C, ptrtoint ([42 x i16]* @Arr to i64)
+ ret i64 %G
+; CHECK-LABEL: @test24b(
+; CHECK-NEXT: shl nuw i64 %A, 1
+; CHECK-NEXT: ret i64
+}
+
+
+define i64 @test25(i8* %P, i64 %A){
+ %B = getelementptr inbounds [42 x i16]* @Arr, i64 0, i64 %A
+ %C = ptrtoint i16* %B to i64
+ %G = sub i64 %C, ptrtoint (i16* getelementptr ([42 x i16]* @Arr, i64 1, i64 0) to i64)
+ ret i64 %G
+; CHECK-LABEL: @test25(
+; CHECK-NEXT: shl nuw i64 %A, 1
+; CHECK-NEXT: add i64 {{.*}}, -84
+; CHECK-NEXT: ret i64
+}
+
+@Arr_as1 = external addrspace(1) global [42 x i16]
+
+define i16 @test25_as1(i8 addrspace(1)* %P, i64 %A) {
+; CHECK: @test25_as1
+; CHECK-NEXT: %1 = trunc i64 %A to i16
+; CHECK-NEXT: shl nuw i16 %1, 1
+; CHECK-NEXT: add i16 {{.*}}, -84
+; CHECK-NEXT: ret i16
+ %B = getelementptr inbounds [42 x i16] addrspace(1)* @Arr_as1, i64 0, i64 %A
+ %C = ptrtoint i16 addrspace(1)* %B to i16
+ %G = sub i16 %C, ptrtoint (i16 addrspace(1)* getelementptr ([42 x i16] addrspace(1)* @Arr_as1, i64 1, i64 0) to i16)
+ ret i16 %G
+}
+
+define i32 @test26(i32 %x) {
+ %shl = shl i32 3, %x
+ %neg = sub i32 0, %shl
+ ret i32 %neg
+; CHECK-LABEL: @test26(
+; CHECK-NEXT: shl i32 -3
+; CHECK-NEXT: ret i32
+}
+
+define i32 @test27(i32 %x, i32 %y) {
+ %mul = mul i32 %y, -8
+ %sub = sub i32 %x, %mul
+ ret i32 %sub
+; CHECK-LABEL: @test27(
+; CHECK-NEXT: shl i32 %y, 3
+; CHECK-NEXT: add i32
+; CHECK-NEXT: ret i32
+}
+
+define i32 @test28(i32 %x, i32 %y, i32 %z) {
+ %neg = sub i32 0, %z
+ %mul = mul i32 %neg, %y
+ %sub = sub i32 %x, %mul
+ ret i32 %sub
+; CHECK-LABEL: @test28(
+; CHECK-NEXT: mul i32 %z, %y
+; CHECK-NEXT: add i32
+; CHECK-NEXT: ret i32
+}
+
+define i64 @test29(i8* %foo, i64 %i, i64 %j) {
+ %gep1 = getelementptr inbounds i8* %foo, i64 %i
+ %gep2 = getelementptr inbounds i8* %foo, i64 %j
+ %cast1 = ptrtoint i8* %gep1 to i64
+ %cast2 = ptrtoint i8* %gep2 to i64
+ %sub = sub i64 %cast1, %cast2
+ ret i64 %sub
+; CHECK-LABEL: @test29(
+; CHECK-NEXT: sub i64 %i, %j
+; CHECK-NEXT: ret i64
+}
+
+define i64 @test30(i8* %foo, i64 %i, i64 %j) {
+ %bit = bitcast i8* %foo to i32*
+ %gep1 = getelementptr inbounds i32* %bit, i64 %i
+ %gep2 = getelementptr inbounds i8* %foo, i64 %j
+ %cast1 = ptrtoint i32* %gep1 to i64
+ %cast2 = ptrtoint i8* %gep2 to i64
+ %sub = sub i64 %cast1, %cast2
+ ret i64 %sub
+; CHECK-LABEL: @test30(
+; CHECK-NEXT: %gep1.idx = shl nuw i64 %i, 2
+; CHECK-NEXT: sub i64 %gep1.idx, %j
+; CHECK-NEXT: ret i64
+}
+
+define i16 @test30_as1(i8 addrspace(1)* %foo, i16 %i, i16 %j) {
+; CHECK-LABEL: @test30_as1(
+; CHECK-NEXT: %gep1.idx = shl nuw i16 %i, 2
+; CHECK-NEXT: sub i16 %gep1.idx, %j
+; CHECK-NEXT: ret i16
+ %bit = bitcast i8 addrspace(1)* %foo to i32 addrspace(1)*
+ %gep1 = getelementptr inbounds i32 addrspace(1)* %bit, i16 %i
+ %gep2 = getelementptr inbounds i8 addrspace(1)* %foo, i16 %j
+ %cast1 = ptrtoint i32 addrspace(1)* %gep1 to i16
+ %cast2 = ptrtoint i8 addrspace(1)* %gep2 to i16
+ %sub = sub i16 %cast1, %cast2
+ ret i16 %sub
+}
+
+define <2 x i64> @test31(<2 x i64> %A) {
+ %xor = xor <2 x i64> %A, <i64 -1, i64 -1>
+ %sub = sub <2 x i64> <i64 2, i64 3>, %xor
+ ret <2 x i64> %sub
+; CHECK-LABEL: @test31(
+; CHECK-NEXT: %sub = add <2 x i64> %A, <i64 3, i64 4>
+; CHECK-NEXT: ret <2 x i64> %sub
+}
+
+define <2 x i64> @test32(<2 x i64> %A) {
+ %add = add <2 x i64> %A, <i64 -1, i64 -1>
+ %sub = sub <2 x i64> <i64 2, i64 3>, %add
+ ret <2 x i64> %sub
+; CHECK-LABEL: @test32(
+; CHECK-NEXT: %sub = sub <2 x i64> <i64 3, i64 4>
+; CHECK-NEXT: ret <2 x i64> %sub
+}
+
+define <2 x i64> @test33(<2 x i1> %A) {
+ %ext = zext <2 x i1> %A to <2 x i64>
+ %sub = sub <2 x i64> zeroinitializer, %ext
+ ret <2 x i64> %sub
+; CHECK-LABEL: @test33(
+; CHECK-NEXT: %sub = sext <2 x i1> %A to <2 x i64>
+; CHECK-NEXT: ret <2 x i64> %sub
+}
+
+define <2 x i64> @test34(<2 x i1> %A) {
+ %ext = sext <2 x i1> %A to <2 x i64>
+ %sub = sub <2 x i64> zeroinitializer, %ext
+ ret <2 x i64> %sub
+; CHECK-LABEL: @test34(
+; CHECK-NEXT: %sub = zext <2 x i1> %A to <2 x i64>
+; CHECK-NEXT: ret <2 x i64> %sub
+}
+
+define <2 x i64> @test35(<2 x i64> %A) {
+ %mul = mul <2 x i64> %A, <i64 3, i64 4>
+ %sub = sub <2 x i64> %A, %mul
+ ret <2 x i64> %sub
+; CHECK-LABEL: @test35(
+; CHECK-NEXT: %sub = mul <2 x i64> %A, <i64 -2, i64 -3>
+; CHECK-NEXT: ret <2 x i64> %sub
+}
+
+define <2 x i64> @test36(<2 x i64> %A) {
+ %shl = shl <2 x i64> %A, <i64 3, i64 4>
+ %sub = sub <2 x i64> %shl, %A
+ ret <2 x i64> %sub
+; CHECK-LABEL: @test36(
+; CHECK-NEXT: %sub = mul <2 x i64> %A, <i64 7, i64 15>
+; CHECK-NEXT: ret <2 x i64> %sub
+}
-; RUN: if as < %s | opt -instcombine -die | dis | grep sub | grep -v 'sub int %Cok, %Bok'
-; RUN: then exit 1
-; RUN: else exit 0
-; RUN: fi
+define <2 x i32> @test37(<2 x i32> %A) {
+ %div = sdiv <2 x i32> %A, <i32 -2147483648, i32 -2147483648>
+ %sub = sub nsw <2 x i32> zeroinitializer, %div
+ ret <2 x i32> %sub
+; CHECK-LABEL: @test37(
+; CHECK-NEXT: [[ICMP:%.*]] = icmp eq <2 x i32> %A, <i32 -2147483648, i32 -2147483648>
+; CHECK-NEXT: [[SEXT:%.*]] = sext <2 x i1> [[ICMP]] to <2 x i32>
+; CHECK-NEXT: ret <2 x i32> [[SEXT]]
+}
-implementation
+define i32 @test38(i32 %A) {
+ %div = sdiv i32 %A, -2147483648
+ %sub = sub nsw i32 0, %div
+ ret i32 %sub
+; CHECK-LABEL: @test38(
+; CHECK-NEXT: [[ICMP:%.*]] = icmp eq i32 %A, -2147483648
+; CHECK-NEXT: [[SEXT:%.*]] = sext i1 [[ICMP]] to i32
+; CHECK-NEXT: ret i32 [[SEXT]]
+}
-int "test1"(int %A) {
- %B = sub int %A, %A ; ISA constant 0
- ret int %B
+define i32 @test39(i32 %A, i32 %x) {
+ %B = sub i32 0, %A
+ %C = sub nsw i32 %x, %B
+ ret i32 %C
+; CHECK-LABEL: @test39(
+; CHECK: %C = add i32 %x, %A
+; CHECK: ret i32 %C
}
-int "test2"(int %A) {
- %B = sub int %A, 0
- ret int %B
+define i16 @test40(i16 %a, i16 %b) {
+ %ashr = ashr i16 %a, 1
+ %ashr1 = ashr i16 %b, 1
+ %sub = sub i16 %ashr, %ashr1
+ ret i16 %sub
+; CHECK-LABEL: @test40(
+; CHECK-NEXT: [[ASHR:%.*]] = ashr i16 %a, 1
+; CHECK-NEXT: [[ASHR1:%.*]] = ashr i16 %b, 1
+; CHECK-NEXT: [[RET:%.*]] = sub nsw i16 [[ASHR]], [[ASHR1]]
+; CHECK: ret i16 [[RET]]
}
-int "test3"(int %A) {
- %B = sub int 0, %A ; B = -A
- %C = sub int 0, %B ; C = -B = A
- ret int %C
+define i32 @test41(i16 %a, i16 %b) {
+ %conv = sext i16 %a to i32
+ %conv1 = sext i16 %b to i32
+ %sub = sub i32 %conv, %conv1
+ ret i32 %sub
+; CHECK-LABEL: @test41(
+; CHECK-NEXT: [[SEXT:%.*]] = sext i16 %a to i32
+; CHECK-NEXT: [[SEXT1:%.*]] = sext i16 %b to i32
+; CHECK-NEXT: [[RET:%.*]] = sub nsw i32 [[SEXT]], [[SEXT1]]
+; CHECK: ret i32 [[RET]]
}
-int "test4"(int %A, int %x) {
- %B = sub int 0, %A
- %C = sub int %x, %B
- ret int %C
+define i4 @test42(i4 %x, i4 %y) {
+ %a = and i4 %y, 7
+ %b = and i4 %x, 7
+ %c = sub i4 %a, %b
+ ret i4 %c
+; CHECK-LABEL: @test42(
+; CHECK-NEXT: [[AND:%.*]] = and i4 %y, 7
+; CHECK-NEXT: [[AND1:%.*]] = and i4 %x, 7
+; CHECK-NEXT: [[RET:%.*]] = sub nsw i4 [[AND]], [[AND1]]
+; CHECK: ret i4 [[RET]]
}
-int "test5"(int %A, int %Bok, int %Cok) {
- %D = sub int %Bok, %Cok
- %E = sub int %A, %D
- ret int %E
+define i4 @test43(i4 %x, i4 %y) {
+ %a = or i4 %x, -8
+ %b = and i4 %y, 7
+ %c = sub i4 %a, %b
+ ret i4 %c
+; CHECK-LABEL: @test43(
+; CHECK-NEXT: [[OR:%.*]] = or i4 %x, -8
+; CHECK-NEXT: [[AND:%.*]] = and i4 %y, 7
+; CHECK-NEXT: [[RET:%.*]] = sub nuw i4 [[OR]], [[AND]]
+; CHECK: ret i4 [[RET]]
}
-int %test6(int %A, int %B) {
- %C = and int %A, %B ; A - (A & B) => A & ~B
- %D = sub int %A, %C
- ret int %D
+define i32 @test44(i32 %x) {
+ %sub = sub nsw i32 %x, 32768
+ ret i32 %sub
+; CHECK-LABEL: @test44(
+; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 %x, -32768
+; CHECK: ret i32 [[ADD]]
}
-int %test7(int %A) {
- %B = sub int -1, %A ; B = ~A
- ret int %B
+define i32 @test45(i32 %x, i32 %y) {
+ %or = or i32 %x, %y
+ %xor = xor i32 %x, %y
+ %sub = sub i32 %or, %xor
+ ret i32 %sub
+; CHECK-LABEL: @test45(
+; CHECK-NEXT: %sub = and i32 %x, %y
+; CHECK: ret i32 %sub
}
+define i32 @test46(i32 %x, i32 %y) {
+ %or = or i32 %x, %y
+ %sub = sub i32 %or, %x
+ ret i32 %sub
+; CHECK-LABEL: @test46(
+; CHECK-NEXT: %x.not = xor i32 %x, -1
+; CHECK-NEXT: %sub = and i32 %y, %x.not
+; CHECK: ret i32 %sub
+}