1 ; RUN: opt < %s -instcombine -S | FileCheck %s 2 3 define i32 @factorize(i32 %x, i32 %y) { 4 ; CHECK-LABEL: @factorize( 5 ; (X | 1) & (X | 2) -> X | (1 & 2) -> X 6 %l = or i32 %x, 1 7 %r = or i32 %x, 2 8 %z = and i32 %l, %r 9 ret i32 %z 10 ; CHECK: ret i32 %x 11 } 12 13 define i32 @factorize2(i32 %x) { 14 ; CHECK-LABEL: @factorize2( 15 ; 3*X - 2*X -> X 16 %l = mul i32 3, %x 17 %r = mul i32 2, %x 18 %z = sub i32 %l, %r 19 ret i32 %z 20 ; CHECK: ret i32 %x 21 } 22 23 define i32 @factorize3(i32 %x, i32 %a, i32 %b) { 24 ; CHECK-LABEL: @factorize3( 25 ; (X | (A|B)) & (X | B) -> X | ((A|B) & B) -> X | B 26 %aORb = or i32 %a, %b 27 %l = or i32 %x, %aORb 28 %r = or i32 %x, %b 29 %z = and i32 %l, %r 30 ret i32 %z 31 ; CHECK: %z = or i32 %b, %x 32 ; CHECK: ret i32 %z 33 } 34 35 define i32 @factorize4(i32 %x, i32 %y) { 36 ; CHECK-LABEL: @factorize4( 37 ; ((Y << 1) * X) - (X * Y) -> (X * (Y * 2 - Y)) -> (X * Y) 38 %sh = shl i32 %y, 1 39 %ml = mul i32 %sh, %x 40 %mr = mul i32 %x, %y 41 %s = sub i32 %ml, %mr 42 ret i32 %s 43 ; CHECK: %s = mul i32 %y, %x 44 ; CHECK: ret i32 %s 45 } 46 47 define i32 @factorize5(i32 %x, i32 %y) { 48 ; CHECK-LABEL: @factorize5( 49 ; ((Y * 2) * X) - (X * Y) -> (X * Y) 50 %sh = mul i32 %y, 2 51 %ml = mul i32 %sh, %x 52 %mr = mul i32 %x, %y 53 %s = sub i32 %ml, %mr 54 ret i32 %s 55 ; CHECK: %s = mul i32 %y, %x 56 ; CHECK: ret i32 %s 57 } 58 59 define i32 @expand(i32 %x) { 60 ; CHECK-LABEL: @expand( 61 ; ((X & 1) | 2) & 1 -> ((X & 1) & 1) | (2 & 1) -> (X & 1) | 0 -> X & 1 62 %a = and i32 %x, 1 63 %b = or i32 %a, 2 64 %c = and i32 %b, 1 65 ret i32 %c 66 ; CHECK: %a = and i32 %x, 1 67 ; CHECK: ret i32 %a 68 } 69
