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/pr33136-2.c | 60 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/pr33136-2.c (limited to 'gcc/testsuite/gcc.dg/pr33136-2.c') diff --git a/gcc/testsuite/gcc.dg/pr33136-2.c b/gcc/testsuite/gcc.dg/pr33136-2.c new file mode 100644 index 000000000..760b5a06f --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr33136-2.c @@ -0,0 +1,60 @@ +/* PR tree-optimization/33136 */ +/* { dg-do run } */ +/* { dg-options "-O2" } */ + +extern void abort (void); + +struct S +{ + void *a; + int b; + int *c; +}; +static int d, e; + +static struct S s; + +static int * +__attribute__((noinline, const)) +foo (void) +{ + return &s.b; +} + +int * +__attribute__((noinline)) +bar (int **f) +{ + s.c = &d; + *f = &e; + /* As nothing ever takes the address of any int * field in struct S, + the write to *f can't alias with the s.c field. */ + return s.c; +} + +int +__attribute__((noinline)) +baz (int *x) +{ + s.b = 1; + *x = 4; + /* Function foo takes address of an int field in struct S, + so *x can alias with the s.b field (and it does in this testcase). */ + return s.b; +} + +int +__attribute__((noinline)) +t (void) +{ + int *f = (int *) 0; + return 10 * (bar (&f) != &d) + baz (foo ()); +} + +int +main (void) +{ + if (t () != 4) + abort (); + return 0; +} -- cgit v1.2.3