| ; RUN: opt < %s -reassociate -constprop -instcombine -dce -S | FileCheck %s |
| |
| ; With sub reassociation, constant folding can eliminate all of the constants. |
| define i32 @test1(i32 %A, i32 %B) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: [[Z:%.*]] = sub i32 %A, %B |
| ; CHECK-NEXT: ret i32 [[Z]] |
| ; |
| %W = add i32 5, %B |
| %X = add i32 -7, %A |
| %Y = sub i32 %X, %W |
| %Z = add i32 %Y, 12 |
| ret i32 %Z |
| } |
| |
| ; With sub reassociation, constant folding can eliminate the two 12 constants. |
| define i32 @test2(i32 %A, i32 %B, i32 %C, i32 %D) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: [[SUM:%.*]] = add i32 %B, %A |
| ; CHECK-NEXT: [[SUM1:%.*]] = add i32 [[SUM]], %C |
| ; CHECK-NEXT: [[Q:%.*]] = sub i32 %D, [[SUM1]] |
| ; CHECK-NEXT: ret i32 [[Q]] |
| ; |
| %M = add i32 %A, 12 |
| %N = add i32 %M, %B |
| %O = add i32 %N, %C |
| %P = sub i32 %D, %O |
| %Q = add i32 %P, 12 |
| ret i32 %Q |
| } |
| |
