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/pr19633.c | 49 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/pr19633.c (limited to 'gcc/testsuite/gcc.dg/pr19633.c') diff --git a/gcc/testsuite/gcc.dg/pr19633.c b/gcc/testsuite/gcc.dg/pr19633.c new file mode 100644 index 000000000..fda0df6c5 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr19633.c @@ -0,0 +1,49 @@ +/* { dg-do link } */ +/* { dg-options "-O2" } */ + +struct S +{ + int w, x, y, z; +}; + +struct T +{ + int r; + struct S s; +}; + +void +foo (int a, struct T b) +{ + struct S *c = 0; + + if (a) + c = &b.s; + + b.s.w = 3; + + /* Since 'c' may be pointing to NULL here, we used to flag it as + pointing anywhere, which was forcing the aliaser to mark as + call-clobbered every other variable pointed-to by 'c' ('b' in + this case). This, in turn, caused the insertion of V_MAY_DEFs + for 'b' at this call-site, which prevented constant propagation + from 'b.s.w = 3' to 'if (b.s.w != 3)'. */ + bar (*c, a); + + if (b.s.w != 3) + link_error (); +} + +int main () +{ + struct T b; + foo (3, b); + return 0; +} + +int X; + +int bar (struct S x, int i) +{ + X = 3; +} -- cgit v1.2.3