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annotate test/CodeGen/AArch64/flags-multiuse.ll @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents 54457678186b
children 3a76565eade5
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1172e4bd9c6f update 4.0.0
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1 ; RUN: llc -mtriple=aarch64-none-linux-gnu -aarch64-enable-atomic-cfg-tidy=0 -verify-machineinstrs -o - %s | FileCheck %s
0
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2
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3 ; LLVM should be able to cope with multiple uses of the same flag-setting
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4 ; instruction at different points of a routine. Either by rematerializing the
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5 ; compare or by saving and restoring the flag register.
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7 declare void @bar()
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9 @var = global i32 0
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11 define i32 @test_multiflag(i32 %n, i32 %m, i32 %o) {
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12 ; CHECK-LABEL: test_multiflag:
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14 %test = icmp ne i32 %n, %m
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15 ; CHECK: cmp [[LHS:w[0-9]+]], [[RHS:w[0-9]+]]
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16
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17 %val = zext i1 %test to i32
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18 ; CHECK: cset {{[xw][0-9]+}}, ne
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19
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20 store i32 %val, i32* @var
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21
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22 call void @bar()
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23 ; CHECK: bl bar
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24
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25 ; Currently, the comparison is emitted again. An MSR/MRS pair would also be
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26 ; acceptable, but assuming the call preserves NZCV is not.
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27 br i1 %test, label %iftrue, label %iffalse
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28 ; CHECK: cmp [[LHS]], [[RHS]]
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29 ; CHECK: b.eq
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30
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31 iftrue:
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32 ret i32 42
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33 iffalse:
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34 ret i32 0
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35 }