Quick: Fix optimizations for empty if blocks.
If a block ending with if-eqz or if-nez has the same "taken"
and "fallthrough", we cannot assume that the value has been
checked against zero in one of the succesors. This affects
the null check elimination pass as well as GVN. Refactor all
those checks to a single function in BasicBlock and check
that the "taken" and "falthrough" are different when needed.
Bug: 21614284
Change-Id: I8c6ac23e96cdaf5984786a555ebbd28110f095cb
diff --git a/test/800-smali/expected.txt b/test/800-smali/expected.txt
index 7be78b7..6c00c82 100644
--- a/test/800-smali/expected.txt
+++ b/test/800-smali/expected.txt
@@ -19,4 +19,5 @@
b/17410612
b/21863767
b/21873167
+b/21614284
Done!
diff --git a/test/800-smali/smali/b_21614284.smali b/test/800-smali/smali/b_21614284.smali
new file mode 100644
index 0000000..3cb1bd0
--- /dev/null
+++ b/test/800-smali/smali/b_21614284.smali
@@ -0,0 +1,22 @@
+.class public LB21614284;
+.super Ljava/lang/Object;
+
+.field private a:I
+
+.method public constructor <init>()V
+ .registers 2
+ invoke-direct {p0}, Ljava/lang/Object;-><init>()V
+ const v0, 42
+ iput v0, p0, LB21614284;->a:I
+ return-void
+.end method
+
+.method public static test(LB21614284;)I
+ .registers 2
+ # Empty if, testing p0.
+ if-nez p0, :label
+ :label
+ # p0 still needs a null check.
+ iget v0, p0, LB21614284;->a:I
+ return v0
+.end method
diff --git a/test/800-smali/src/Main.java b/test/800-smali/src/Main.java
index 2180186..ab4457e 100644
--- a/test/800-smali/src/Main.java
+++ b/test/800-smali/src/Main.java
@@ -86,6 +86,8 @@
testCases.add(new TestCase("b/21863767", "B21863767", "run", null, null,
null));
testCases.add(new TestCase("b/21873167", "B21873167", "test", null, null, null));
+ testCases.add(new TestCase("b/21614284", "B21614284", "test", new Object[] { null },
+ new NullPointerException(), null));
}
public void runTests() {