1 ; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py 2 ; RUN: opt -S -analyze -scalar-evolution < %s | FileCheck %s 3 4 ; The obvious case. 5 define i32 @udiv_biggerLshr(i32 %val) nounwind { 6 ; CHECK-LABEL: 'udiv_biggerLshr' 7 ; CHECK-NEXT: Classifying expressions for: @udiv_biggerLshr 8 ; CHECK-NEXT: %tmp1 = udiv i32 %val, 64 9 ; CHECK-NEXT: --> (%val /u 64) U: [0,67108864) S: [0,67108864) 10 ; CHECK-NEXT: %tmp2 = mul i32 %tmp1, 16 11 ; CHECK-NEXT: --> (16 * (%val /u 64))<nuw><nsw> U: [0,1073741809) S: [0,1073741809) 12 ; CHECK-NEXT: Determining loop execution counts for: @udiv_biggerLshr 13 ; 14 %tmp1 = udiv i32 %val, 64 15 %tmp2 = mul i32 %tmp1, 16 16 ret i32 %tmp2 17 } 18 19 define i32 @udiv_biggerShl(i32 %val) nounwind { 20 ; CHECK-LABEL: 'udiv_biggerShl' 21 ; CHECK-NEXT: Classifying expressions for: @udiv_biggerShl 22 ; CHECK-NEXT: %tmp1 = udiv i32 %val, 16 23 ; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456) 24 ; CHECK-NEXT: %tmp2 = mul i32 %tmp1, 64 25 ; CHECK-NEXT: --> (64 * (%val /u 16)) U: [0,-63) S: [-2147483648,2147483585) 26 ; CHECK-NEXT: Determining loop execution counts for: @udiv_biggerShl 27 ; 28 %tmp1 = udiv i32 %val, 16 29 %tmp2 = mul i32 %tmp1, 64 30 ret i32 %tmp2 31 } 32 33 ; Or, it could have been transformed to shifts 34 35 define i32 @shifty_biggerLshr(i32 %val) { 36 ; CHECK-LABEL: 'shifty_biggerLshr' 37 ; CHECK-NEXT: Classifying expressions for: @shifty_biggerLshr 38 ; CHECK-NEXT: %tmp1 = lshr i32 %val, 6 39 ; CHECK-NEXT: --> (%val /u 64) U: [0,67108864) S: [0,67108864) 40 ; CHECK-NEXT: %tmp2 = shl i32 %tmp1, 4 41 ; CHECK-NEXT: --> (16 * (%val /u 64))<nuw><nsw> U: [0,1073741809) S: [0,1073741809) 42 ; CHECK-NEXT: Determining loop execution counts for: @shifty_biggerLshr 43 ; 44 %tmp1 = lshr i32 %val, 6 45 %tmp2 = shl i32 %tmp1, 4 46 ret i32 %tmp2 47 } 48 49 define i32 @shifty_biggerLshr_lshrexact(i32 %val) { 50 ; CHECK-LABEL: 'shifty_biggerLshr_lshrexact' 51 ; CHECK-NEXT: Classifying expressions for: @shifty_biggerLshr_lshrexact 52 ; CHECK-NEXT: %tmp1 = lshr exact i32 %val, 6 53 ; CHECK-NEXT: --> (%val /u 64) U: [0,67108864) S: [0,67108864) 54 ; CHECK-NEXT: %tmp2 = shl i32 %tmp1, 4 55 ; CHECK-NEXT: --> (16 * (%val /u 64))<nuw><nsw> U: [0,1073741809) S: [0,1073741809) 56 ; CHECK-NEXT: Determining loop execution counts for: @shifty_biggerLshr_lshrexact 57 ; 58 %tmp1 = lshr exact i32 %val, 6 59 %tmp2 = shl i32 %tmp1, 4 60 ret i32 %tmp2 61 } 62 63 define i32 @shifty_biggerShr(i32 %val) { 64 ; CHECK-LABEL: 'shifty_biggerShr' 65 ; CHECK-NEXT: Classifying expressions for: @shifty_biggerShr 66 ; CHECK-NEXT: %tmp1 = lshr i32 %val, 4 67 ; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456) 68 ; CHECK-NEXT: %tmp2 = shl i32 %tmp1, 6 69 ; CHECK-NEXT: --> (64 * (%val /u 16)) U: [0,-63) S: [-2147483648,2147483585) 70 ; CHECK-NEXT: Determining loop execution counts for: @shifty_biggerShr 71 ; 72 %tmp1 = lshr i32 %val, 4 73 %tmp2 = shl i32 %tmp1, 6 74 ret i32 %tmp2 75 } 76 77 define i32 @shifty_biggerShr_lshrexact(i32 %val) { 78 ; CHECK-LABEL: 'shifty_biggerShr_lshrexact' 79 ; CHECK-NEXT: Classifying expressions for: @shifty_biggerShr_lshrexact 80 ; CHECK-NEXT: %tmp1 = lshr exact i32 %val, 4 81 ; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456) 82 ; CHECK-NEXT: %tmp2 = shl i32 %tmp1, 6 83 ; CHECK-NEXT: --> (64 * (%val /u 16)) U: [0,-63) S: [-2147483648,2147483585) 84 ; CHECK-NEXT: Determining loop execution counts for: @shifty_biggerShr_lshrexact 85 ; 86 %tmp1 = lshr exact i32 %val, 4 87 %tmp2 = shl i32 %tmp1, 6 88 ret i32 %tmp2 89 } 90 91 ; Or, further folded into mask variant. 92 93 define i32 @masky_biggerLshr(i32 %val) { 94 ; CHECK-LABEL: 'masky_biggerLshr' 95 ; CHECK-NEXT: Classifying expressions for: @masky_biggerLshr 96 ; CHECK-NEXT: %tmp1 = lshr i32 %val, 2 97 ; CHECK-NEXT: --> (%val /u 4) U: [0,1073741824) S: [0,1073741824) 98 ; CHECK-NEXT: %tmp2 = and i32 %tmp1, -16 99 ; CHECK-NEXT: --> (16 * (%val /u 64))<nuw><nsw> U: [0,1073741809) S: [0,1073741809) 100 ; CHECK-NEXT: Determining loop execution counts for: @masky_biggerLshr 101 ; 102 %tmp1 = lshr i32 %val, 2 103 %tmp2 = and i32 %tmp1, -16 104 ret i32 %tmp2 105 } 106 107 define i32 @masky_biggerLshr_lshrexact(i32 %val) { 108 ; CHECK-LABEL: 'masky_biggerLshr_lshrexact' 109 ; CHECK-NEXT: Classifying expressions for: @masky_biggerLshr_lshrexact 110 ; CHECK-NEXT: %tmp1 = lshr exact i32 %val, 2 111 ; CHECK-NEXT: --> (%val /u 4) U: [0,1073741824) S: [0,1073741824) 112 ; CHECK-NEXT: Determining loop execution counts for: @masky_biggerLshr_lshrexact 113 ; 114 %tmp1 = lshr exact i32 %val, 2 115 ret i32 %tmp1 116 } 117 118 define i32 @masky_biggerShr(i32 %val) { 119 ; CHECK-LABEL: 'masky_biggerShr' 120 ; CHECK-NEXT: Classifying expressions for: @masky_biggerShr 121 ; CHECK-NEXT: %tmp1 = shl i32 %val, 2 122 ; CHECK-NEXT: --> (4 * %val) U: [0,-3) S: [-2147483648,2147483645) 123 ; CHECK-NEXT: %tmp2 = and i32 %tmp1, -64 124 ; CHECK-NEXT: --> (64 * (zext i26 (trunc i32 (%val /u 16) to i26) to i32))<nuw> U: [0,-63) S: [0,-63) 125 ; CHECK-NEXT: Determining loop execution counts for: @masky_biggerShr 126 ; 127 %tmp1 = shl i32 %val, 2 128 %tmp2 = and i32 %tmp1, -64 129 ret i32 %tmp2 130 } 131 132 define i32 @masky_biggerShr_lshrexact(i32 %val) { 133 ; CHECK-LABEL: 'masky_biggerShr_lshrexact' 134 ; CHECK-NEXT: Classifying expressions for: @masky_biggerShr_lshrexact 135 ; CHECK-NEXT: %tmp1 = shl i32 %val, 2 136 ; CHECK-NEXT: --> (4 * %val) U: [0,-3) S: [-2147483648,2147483645) 137 ; CHECK-NEXT: Determining loop execution counts for: @masky_biggerShr_lshrexact 138 ; 139 %tmp1 = shl i32 %val, 2 140 ret i32 %tmp1 141 } 142
