| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=instsimplify -S | FileCheck %s |
| |
| ; PR8862 |
| |
| define i32 @shift1(i32 %A, i32 %B) { |
| ; CHECK-LABEL: @shift1( |
| ; CHECK-NEXT: ret i32 [[A:%.*]] |
| ; |
| %C = lshr exact i32 %A, %B |
| %D = shl nuw i32 %C, %B |
| ret i32 %D |
| } |
| |
| define i32 @shift2(i32 %A, i32 %B) { |
| ; CHECK-LABEL: @shift2( |
| ; CHECK-NEXT: [[C:%.*]] = lshr i32 [[A:%.*]], [[B:%.*]] |
| ; CHECK-NEXT: [[D:%.*]] = shl nuw i32 [[C]], [[B]] |
| ; CHECK-NEXT: ret i32 [[D]] |
| ; |
| %C = lshr i32 %A, %B |
| %D = shl nuw i32 %C, %B |
| ret i32 %D |
| } |
| |
| define i32 @shift3(i32 %A, i32 %B) { |
| ; CHECK-LABEL: @shift3( |
| ; CHECK-NEXT: ret i32 [[A:%.*]] |
| ; |
| %C = ashr exact i32 %A, %B |
| %D = shl nuw i32 %C, %B |
| ret i32 %D |
| } |
| |
| define i32 @shift4(i32 %A, i32 %B) { |
| ; CHECK-LABEL: @shift4( |
| ; CHECK-NEXT: ret i32 [[A:%.*]] |
| ; |
| %C = shl nuw i32 %A, %B |
| %D = lshr i32 %C, %B |
| ret i32 %D |
| } |
| |
| define i32 @shift5(i32 %A, i32 %B) { |
| ; CHECK-LABEL: @shift5( |
| ; CHECK-NEXT: ret i32 [[A:%.*]] |
| ; |
| %C = shl nsw i32 %A, %B |
| %D = ashr i32 %C, %B |
| ret i32 %D |
| } |
| |
| define i32 @div1(i32 %V) { |
| ; CHECK-LABEL: @div1( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %A = udiv i32 %V, -2147483648 |
| %B = udiv i32 %A, -2147483648 |
| ret i32 %B |
| } |
| |
| define i32 @div2(i32 %V) { |
| ; CHECK-LABEL: @div2( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %A = sdiv i32 %V, -1 |
| %B = sdiv i32 %A, -2147483648 |
| ret i32 %B |
| } |
| |