http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54691
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> 2012-10-14 19:23:11 UTC --- (In reply to comment #7) > Created attachment 28445 [details] > Prototype patch that introduces VALGRIND_MAKE_MEM_DEFINED > > Attached prototype patch builds on HJ's patch. The patch detects valgrind in > the same way as in gcc directory (actually, it just copies relevant bits) and > changes: > > + memset (to.text + to.len + 1, 0, 16); > > to > > + VALGRIND_DISCARD (VALGRIND_MAKE_MEM_DEFINED (to.text + to.len + 1, > 16)); > > (BTW: Probably, we should align end of buffer to 16 byte boundary instead of > hardcoding 16.) > libcpp will read in advance beyond the end of buffer in some cases, even without SSE optimization.
