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150
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1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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252
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2 ; RUN: opt < %s -passes=reassociate,instcombine,dce -S | FileCheck %s
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150
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3
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4 ; With sub reassociation, constant folding can eliminate all of the constants.
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5 define i32 @test1(i32 %A, i32 %B) {
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6 ; CHECK-LABEL: @test1(
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7 ; CHECK-NEXT: [[Z:%.*]] = sub i32 [[A:%.*]], [[B:%.*]]
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8 ; CHECK-NEXT: ret i32 [[Z]]
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9 ;
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10 %W = add i32 5, %B
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11 %X = add i32 -7, %A
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12 %Y = sub i32 %X, %W
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13 %Z = add i32 %Y, 12
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14 ret i32 %Z
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15 }
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16
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17 ; With sub reassociation, constant folding can eliminate the two 12 constants.
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18 define i32 @test2(i32 %A, i32 %B, i32 %C, i32 %D) {
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19 ; CHECK-LABEL: @test2(
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20 ; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[B:%.*]], [[A:%.*]]
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21 ; CHECK-NEXT: [[TMP2:%.*]] = add i32 [[TMP1]], [[C:%.*]]
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22 ; CHECK-NEXT: [[Q:%.*]] = sub i32 [[D:%.*]], [[TMP2]]
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23 ; CHECK-NEXT: ret i32 [[Q]]
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24 ;
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25 %M = add i32 %A, 12
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26 %N = add i32 %M, %B
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27 %O = add i32 %N, %C
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28 %P = sub i32 %D, %O
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29 %Q = add i32 %P, 12
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30 ret i32 %Q
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31 }
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32
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