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      1 # Copyright (C) 2015 The Android Open Source Project
      2 #
      3 # Licensed under the Apache License, Version 2.0 (the "License");
      4 # you may not use this file except in compliance with the License.
      5 # You may obtain a copy of the License at
      6 #
      7 #      http://www.apache.org/licenses/LICENSE-2.0
      8 #
      9 # Unless required by applicable law or agreed to in writing, software
     10 # distributed under the License is distributed on an "AS IS" BASIS,
     11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 # See the License for the specific language governing permissions and
     13 # limitations under the License.
     14 
     15 .class public LTestCase;
     16 
     17 .super Ljava/lang/Object;
     18 
     19 # The phi in this method has no actual uses but one environment use. It will
     20 # be eliminated in normal mode but kept live in debuggable mode. Test that
     21 # Checker runs the correct test for each compilation mode.
     22 
     23 ## CHECK-START: int TestCase.deadPhi(int, int, int) builder (after)
     24 ## CHECK-NOT:         Phi
     25 
     26 ## CHECK-START-DEBUGGABLE: int TestCase.deadPhi(int, int, int) builder (after)
     27 ## CHECK:             Phi
     28 
     29 .method public static deadPhi(III)I
     30   .registers 8
     31 
     32   move v0, p1
     33   if-eqz p0, :after
     34   move v0, p2
     35   :after
     36   # v0 = Phi [p1, p2] with no uses
     37 
     38   invoke-static {}, Ljava/lang/System;->nanoTime()J  # create an env use
     39 
     40   :return
     41   return p2
     42 .end method
     43