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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 define i32 @test_sdiv_canonicalize_op0(i32 %x, i32 %y) {
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5 ; CHECK-LABEL: @test_sdiv_canonicalize_op0(
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6 ; CHECK-NEXT: [[SDIV1:%.*]] = sdiv i32 [[X:%.*]], [[Y:%.*]]
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7 ; CHECK-NEXT: [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]]
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8 ; CHECK-NEXT: ret i32 [[SDIV]]
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9 ;
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10 %neg = sub nsw i32 0, %x
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11 %sdiv = sdiv i32 %neg, %y
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12 ret i32 %sdiv
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13 }
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14
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15 define i32 @test_sdiv_canonicalize_op0_exact(i32 %x, i32 %y) {
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16 ; CHECK-LABEL: @test_sdiv_canonicalize_op0_exact(
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17 ; CHECK-NEXT: [[SDIV1:%.*]] = sdiv exact i32 [[X:%.*]], [[Y:%.*]]
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18 ; CHECK-NEXT: [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]]
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19 ; CHECK-NEXT: ret i32 [[SDIV]]
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20 ;
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21 %neg = sub nsw i32 0, %x
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22 %sdiv = sdiv exact i32 %neg, %y
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23 ret i32 %sdiv
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24 }
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25
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26 ; (X/-Y) is not equal to -(X/Y), don't canonicalize.
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27 define i32 @test_sdiv_canonicalize_op1(i32 %x, i32 %z) {
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28 ; CHECK-LABEL: @test_sdiv_canonicalize_op1(
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29 ; CHECK-NEXT: [[Y:%.*]] = mul i32 [[Z:%.*]], 3
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30 ; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
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31 ; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[Y]], [[NEG]]
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32 ; CHECK-NEXT: ret i32 [[SDIV]]
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33 ;
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34 %y = mul i32 %z, 3
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35 %neg = sub nsw i32 0, %x
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36 %sdiv = sdiv i32 %y, %neg
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37 ret i32 %sdiv
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38 }
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39
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40 define i32 @test_sdiv_canonicalize_nonsw(i32 %x, i32 %y) {
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41 ; CHECK-LABEL: @test_sdiv_canonicalize_nonsw(
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42 ; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]]
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43 ; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]]
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44 ; CHECK-NEXT: ret i32 [[SDIV]]
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45 ;
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46 %neg = sub i32 0, %x
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47 %sdiv = sdiv i32 %neg, %y
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48 ret i32 %sdiv
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49 }
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50
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51 define <2 x i32> @test_sdiv_canonicalize_vec(<2 x i32> %x, <2 x i32> %y) {
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52 ; CHECK-LABEL: @test_sdiv_canonicalize_vec(
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53 ; CHECK-NEXT: [[SDIV1:%.*]] = sdiv <2 x i32> [[X:%.*]], [[Y:%.*]]
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54 ; CHECK-NEXT: [[SDIV:%.*]] = sub nsw <2 x i32> zeroinitializer, [[SDIV1]]
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55 ; CHECK-NEXT: ret <2 x i32> [[SDIV]]
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56 ;
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57 %neg = sub nsw <2 x i32> <i32 0, i32 0>, %x
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58 %sdiv = sdiv <2 x i32> %neg, %y
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59 ret <2 x i32> %sdiv
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60 }
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61
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62 define i32 @test_sdiv_canonicalize_multiple_uses(i32 %x, i32 %y) {
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63 ; CHECK-LABEL: @test_sdiv_canonicalize_multiple_uses(
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64 ; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
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65 ; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]]
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66 ; CHECK-NEXT: [[SDIV2:%.*]] = sdiv i32 [[SDIV]], [[NEG]]
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67 ; CHECK-NEXT: ret i32 [[SDIV2]]
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68 ;
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69 %neg = sub nsw i32 0, %x
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70 %sdiv = sdiv i32 %neg, %y
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71 %sdiv2 = sdiv i32 %sdiv, %neg
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72 ret i32 %sdiv2
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73 }
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74
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75 ; There is combination: -(X/CE) -> (X/-CE).
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76 ; If combines (X/-CE) to -(X/CE), make sure don't combine them endless.
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77
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78 @X = global i32 5
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79
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80 define i64 @test_sdiv_canonicalize_constexpr(i64 %L1) {
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81 ; currently opt folds (sub nsw i64 0, constexpr) -> (sub i64, 0, constexpr).
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82 ; sdiv canonicalize requires a nsw sub.
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83 ; CHECK-LABEL: @test_sdiv_canonicalize_constexpr(
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84 ; CHECK-NEXT: [[B4:%.*]] = sdiv i64 [[L1:%.*]], sub (i64 0, i64 ptrtoint (i32* @X to i64))
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85 ; CHECK-NEXT: ret i64 [[B4]]
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86 ;
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87 %v1 = ptrtoint i32* @X to i64
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88 %B8 = sub nsw i64 0, %v1
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89 %B4 = sdiv i64 %L1, %B8
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90 ret i64 %B4
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91 }
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