From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/testsuite/gcc.dg/tree-ssa/pr21559.c | 43 +++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr21559.c (limited to 'gcc/testsuite/gcc.dg/tree-ssa/pr21559.c') diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c b/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c new file mode 100644 index 000000000..34f4a01db --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr21559.c @@ -0,0 +1,43 @@ +/* { 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. */ +/* { dg-final { scan-tree-dump-times "Threaded jump" 3 "vrp1" } } */ + +/* { dg-final { cleanup-tree-dump "vrp1" } } */ + -- cgit v1.2.3