On 2009-04-20 10:04:00 -0400, Joern Rennecke wrote: >> As the bug occurs only when malloc is in the tested function, > > Note that gcc 'knows' that memory obtained by malloc does not > alias other memory.
Yes, in the case of GMP, this was a GMP internal function, not malloc, but this function is declared with __attribute__ ((malloc)), and the bug disappears if I remove this attribute. I noticed that when I tried to simplify the testcase. > You can use a differently named wrapper function for malloc, > or use the malloc attribute for another function, to experiment > how this affects code generation. I did a test with a wrapper function my_malloc (that just calls malloc and returns its value), but the bug was still visible, perhaps due to optimization. -- Vincent Lefèvre <vinc...@vinc17.org> - Web: <http://www.vinc17.org/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/> Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)
