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147
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1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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2 ; RUN: opt %s -instcombine -S | FileCheck %s
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3
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4 ; Fold
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5 ; x - ((x / y) * y)
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6 ; to
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7 ; x % y
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8
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9 ; Also,
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10 ; ((x / y) * y)
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11 ; can then be simplified to
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12 ; x - (x % y)
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13
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14 declare void @use8(i8)
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15 declare void @use2xi8(<2 x i8>)
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16
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17 define i8 @t0_basic(i8 %x, i8 %y) {
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18 ; CHECK-LABEL: @t0_basic(
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19 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], [[Y:%.*]]
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20 ; CHECK-NEXT: call void @use8(i8 [[DIV]])
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21 ; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]]
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22 ; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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23 ; CHECK-NEXT: ret i8 [[REM]]
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24 ;
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25 %div = sdiv i8 %x, %y
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26 call void @use8(i8 %div)
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27 %roundXdownToMultipleOfY = mul i8 %div, %y
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28 %rem = sub i8 %x, %roundXdownToMultipleOfY
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29 ret i8 %rem
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30 }
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31
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32 define <2 x i8> @t1_vector(<2 x i8> %x, <2 x i8> %y) {
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33 ; CHECK-LABEL: @t1_vector(
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34 ; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i8> [[X:%.*]], [[Y:%.*]]
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35 ; CHECK-NEXT: call void @use2xi8(<2 x i8> [[DIV]])
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36 ; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul <2 x i8> [[DIV]], [[Y]]
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37 ; CHECK-NEXT: [[REM:%.*]] = sub <2 x i8> [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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38 ; CHECK-NEXT: ret <2 x i8> [[REM]]
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39 ;
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40 %div = sdiv <2 x i8> %x, %y
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41 call void @use2xi8(<2 x i8> %div)
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42 %roundXdownToMultipleOfY = mul <2 x i8> %div, %y
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43 %rem = sub <2 x i8> %x, %roundXdownToMultipleOfY
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44 ret <2 x i8> %rem
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45 }
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46
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47 ; Extra use
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48
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49 define i8 @t4_extrause(i8 %x, i8 %y) {
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50 ; CHECK-LABEL: @t4_extrause(
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51 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], [[Y:%.*]]
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52 ; CHECK-NEXT: call void @use8(i8 [[DIV]])
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53 ; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]]
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54 ; CHECK-NEXT: call void @use8(i8 [[ROUNDXDOWNTOMULTIPLEOFY]])
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55 ; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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56 ; CHECK-NEXT: ret i8 [[REM]]
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57 ;
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58 %div = sdiv i8 %x, %y
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59 call void @use8(i8 %div)
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60 %roundXdownToMultipleOfY = mul i8 %div, %y
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61 call void @use8(i8 %roundXdownToMultipleOfY)
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62 %rem = sub i8 %x, %roundXdownToMultipleOfY
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63 ret i8 %rem
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64 }
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65
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66 ; Commutativity
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67
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68 declare i8 @gen8()
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69
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70 define i8 @t5_commutative(i8 %x) {
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71 ; CHECK-LABEL: @t5_commutative(
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72 ; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8()
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73 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], [[Y]]
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74 ; CHECK-NEXT: call void @use8(i8 [[DIV]])
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75 ; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[Y]], [[DIV]]
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76 ; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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77 ; CHECK-NEXT: ret i8 [[REM]]
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78 ;
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79 %y = call i8 @gen8()
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80 %div = sdiv i8 %x, %y
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81 call void @use8(i8 %div)
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82 %roundXdownToMultipleOfY = mul i8 %y, %div ; swapped
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83 %rem = sub i8 %x, %roundXdownToMultipleOfY
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84 ret i8 %rem
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85 }
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86
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87 ; Negative tests
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88
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89 define i8 @n6_different_x(i8 %x0, i8 %x1, i8 %y) {
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90 ; CHECK-LABEL: @n6_different_x(
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91 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X0:%.*]], [[Y:%.*]]
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92 ; CHECK-NEXT: call void @use8(i8 [[DIV]])
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93 ; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]]
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94 ; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X1:%.*]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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95 ; CHECK-NEXT: ret i8 [[REM]]
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96 ;
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97 %div = sdiv i8 %x0, %y
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98 call void @use8(i8 %div)
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99 %roundXdownToMultipleOfY = mul i8 %div, %y
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100 %rem = sub i8 %x1, %roundXdownToMultipleOfY
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101 ret i8 %rem
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102 }
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103
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104 define i8 @n6_different_y(i8 %x, i8 %y0, i8 %y1) {
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105 ; CHECK-LABEL: @n6_different_y(
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106 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], [[Y0:%.*]]
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107 ; CHECK-NEXT: call void @use8(i8 [[DIV]])
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108 ; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y1:%.*]]
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109 ; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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110 ; CHECK-NEXT: ret i8 [[REM]]
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111 ;
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112 %div = sdiv i8 %x, %y0
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113 call void @use8(i8 %div)
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114 %roundXdownToMultipleOfY = mul i8 %div, %y1
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115 %rem = sub i8 %x, %roundXdownToMultipleOfY
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116 ret i8 %rem
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117 }
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