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authorBen Cheng <bccheng@google.com>2014-03-26 05:37:19 (GMT)
committerBen Cheng <bccheng@google.com>2014-03-26 05:37:19 (GMT)
commit1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch)
treec607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c
parent283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff)
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Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c')
-rw-r--r--gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c
new file mode 100644
index 0000000..6378d1a
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c
@@ -0,0 +1,44 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp1-details" } */
+
+static int blocksize = 4096;
+
+int bar (int);
+
+void foo (void)
+{
+ int toread;
+ int bytes;
+ static char eof_reached = 0;
+
+ toread = blocksize;
+ bytes = 1;
+
+ while (toread != 0)
+ {
+ bytes = bar (toread);
+ if (bytes <= 0)
+ {
+ if (bytes < 0)
+ continue;
+ break;
+ }
+ toread -= bytes;
+ }
+
+ if (bytes == 0)
+ eof_reached = 1;
+}
+
+
+/* First, we should simplify the bits < 0 test within the loop. */
+/* { dg-final { scan-tree-dump-times "Simplified relational" 1 "vrp1" } } */
+
+/* Second, we should thread the edge out of the loop via the break
+ statement. We also realize that the final bytes == 0 test is useless,
+ and thread over it. We also know that toread != 0 is useless when
+ entering while loop and thread over it. */
+/* { dg-final { scan-tree-dump-times "Threaded jump" 3 "vrp1" } } */
+
+/* { dg-final { cleanup-tree-dump "vrp1" } } */
+