1 ; RUN: opt < %s -reassociate -constprop -instcombine -dce -S | FileCheck %s 2 3 ; With sub reassociation, constant folding can eliminate all of the constants. 4 define i32 @test1(i32 %A, i32 %B) { 5 ; CHECK-LABEL: @test1( 6 ; CHECK-NEXT: [[Z:%.*]] = sub i32 %A, %B 7 ; CHECK-NEXT: ret i32 [[Z]] 8 ; 9 %W = add i32 5, %B 10 %X = add i32 -7, %A 11 %Y = sub i32 %X, %W 12 %Z = add i32 %Y, 12 13 ret i32 %Z 14 } 15 16 ; With sub reassociation, constant folding can eliminate the two 12 constants. 17 define i32 @test2(i32 %A, i32 %B, i32 %C, i32 %D) { 18 ; CHECK-LABEL: @test2( 19 ; CHECK-NEXT: [[SUM:%.*]] = add i32 %B, %A 20 ; CHECK-NEXT: [[SUM1:%.*]] = add i32 [[SUM]], %C 21 ; CHECK-NEXT: [[Q:%.*]] = sub i32 %D, [[SUM1]] 22 ; CHECK-NEXT: ret i32 [[Q]] 23 ; 24 %M = add i32 %A, 12 25 %N = add i32 %M, %B 26 %O = add i32 %N, %C 27 %P = sub i32 %D, %O 28 %Q = add i32 %P, 12 29 ret i32 %Q 30 } 31 32
