| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| define i32 @test1(i32 %A) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: ret i32 %A |
| ; |
| %B = xor i32 %A, -1 |
| %C = xor i32 %B, -1 |
| ret i32 %C |
| } |
| |
| define i1 @invert_icmp(i32 %A, i32 %B) { |
| ; CHECK-LABEL: @invert_icmp( |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 %A, %B |
| ; CHECK-NEXT: ret i1 [[CMP]] |
| ; |
| %cmp = icmp sle i32 %A, %B |
| %not = xor i1 %cmp, true |
| ret i1 %not |
| } |
| |
| ; PR1570 |
| |
| define i1 @invert_fcmp(float %X, float %Y) { |
| ; CHECK-LABEL: @invert_fcmp( |
| ; CHECK-NEXT: [[CMP:%.*]] = fcmp uge float %X, %Y |
| ; CHECK-NEXT: ret i1 [[CMP]] |
| ; |
| %cmp = fcmp olt float %X, %Y |
| %not = xor i1 %cmp, true |
| ret i1 %not |
| } |
| |
| ; PR2298 |
| |
| define i1 @not_not_cmp(i32 %a, i32 %b) { |
| ; CHECK-LABEL: @not_not_cmp( |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 %b, %a |
| ; CHECK-NEXT: ret i1 [[CMP]] |
| ; |
| %nota = xor i32 %a, -1 |
| %notb = xor i32 %b, -1 |
| %cmp = icmp slt i32 %nota, %notb |
| ret i1 %cmp |
| } |
| |
| define <2 x i1> @not_not_cmp_vector(<2 x i32> %a, <2 x i32> %b) { |
| ; CHECK-LABEL: @not_not_cmp_vector( |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp ugt <2 x i32> %b, %a |
| ; CHECK-NEXT: ret <2 x i1> [[CMP]] |
| ; |
| %nota = xor <2 x i32> %a, <i32 -1, i32 -1> |
| %notb = xor <2 x i32> %b, <i32 -1, i32 -1> |
| %cmp = icmp ugt <2 x i32> %nota, %notb |
| ret <2 x i1> %cmp |
| } |
| |
| define i1 @not_cmp_constant(i32 %a) { |
| ; CHECK-LABEL: @not_cmp_constant( |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 %a, -43 |
| ; CHECK-NEXT: ret i1 [[CMP]] |
| ; |
| %nota = xor i32 %a, -1 |
| %cmp = icmp ugt i32 %nota, 42 |
| ret i1 %cmp |
| } |
| |
| define <2 x i1> @not_cmp_constant_vector(<2 x i32> %a) { |
| ; CHECK-LABEL: @not_cmp_constant_vector( |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <2 x i32> %a, <i32 -43, i32 -43> |
| ; CHECK-NEXT: ret <2 x i1> [[CMP]] |
| ; |
| %nota = xor <2 x i32> %a, <i32 -1, i32 -1> |
| %cmp = icmp slt <2 x i32> %nota, <i32 42, i32 42> |
| ret <2 x i1> %cmp |
| } |
| |
| define <2 x i1> @test7(<2 x i32> %A, <2 x i32> %B) { |
| ; CHECK-LABEL: @test7( |
| ; CHECK-NEXT: [[COND:%.*]] = icmp sgt <2 x i32> %A, %B |
| ; CHECK-NEXT: ret <2 x i1> [[COND]] |
| ; |
| %cond = icmp sle <2 x i32> %A, %B |
| %Ret = xor <2 x i1> %cond, <i1 true, i1 true> |
| ret <2 x i1> %Ret |
| } |
| |
| define i32 @not_ashr_not(i32 %A, i32 %B) { |
| ; CHECK-LABEL: @not_ashr_not( |
| ; CHECK-NEXT: [[NOT2:%.*]] = ashr i32 %A, %B |
| ; CHECK-NEXT: ret i32 [[NOT2]] |
| ; |
| %not1 = xor i32 %A, -1 |
| %ashr = ashr i32 %not1, %B |
| %not2 = xor i32 %ashr, -1 |
| ret i32 %not2 |
| } |
| |
| define i8 @not_ashr_const(i8 %x) { |
| ; CHECK-LABEL: @not_ashr_const( |
| ; CHECK-NEXT: [[NOT:%.*]] = lshr i8 41, %x |
| ; CHECK-NEXT: ret i8 [[NOT]] |
| ; |
| %shr = ashr i8 -42, %x |
| %not = xor i8 %shr, -1 |
| ret i8 %not |
| } |
| |
| define <2 x i8> @not_ashr_const_splat(<2 x i8> %x) { |
| ; CHECK-LABEL: @not_ashr_const_splat( |
| ; CHECK-NEXT: [[NOT:%.*]] = lshr <2 x i8> <i8 41, i8 41>, %x |
| ; CHECK-NEXT: ret <2 x i8> [[NOT]] |
| ; |
| %shr = ashr <2 x i8> <i8 -42, i8 -42>, %x |
| %not = xor <2 x i8> %shr, <i8 -1, i8 -1> |
| ret <2 x i8> %not |
| } |
| |
| ; We can't get rid of the 'not' on a logical shift of a negative constant. |
| |
| define i8 @not_lshr_const_negative(i8 %x) { |
| ; CHECK-LABEL: @not_lshr_const_negative( |
| ; CHECK-NEXT: [[SHR:%.*]] = lshr i8 -42, %x |
| ; CHECK-NEXT: [[NOT:%.*]] = xor i8 [[SHR]], -1 |
| ; CHECK-NEXT: ret i8 [[NOT]] |
| ; |
| %shr = lshr i8 -42, %x |
| %not = xor i8 %shr, -1 |
| ret i8 %not |
| } |
| |
| define i8 @not_lshr_const(i8 %x) { |
| ; CHECK-LABEL: @not_lshr_const( |
| ; CHECK-NEXT: [[NOT:%.*]] = ashr i8 -43, %x |
| ; CHECK-NEXT: ret i8 [[NOT]] |
| ; |
| %shr = lshr i8 42, %x |
| %not = xor i8 %shr, -1 |
| ret i8 %not |
| } |
| |
| define <2 x i8> @not_lshr_const_splat(<2 x i8> %x) { |
| ; CHECK-LABEL: @not_lshr_const_splat( |
| ; CHECK-NEXT: [[NOT:%.*]] = ashr <2 x i8> <i8 -43, i8 -43>, %x |
| ; CHECK-NEXT: ret <2 x i8> [[NOT]] |
| ; |
| %shr = lshr <2 x i8> <i8 42, i8 42>, %x |
| %not = xor <2 x i8> %shr, <i8 -1, i8 -1> |
| ret <2 x i8> %not |
| } |
| |