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Let me try again: I've prepared a patch for: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49519 It fixes the problem of tailcall optimization: check for stack overlapping was not strict enough. Patch adds another check for clobbered stack area. If address comes from a register - we have no idea about destination of that address. That means we must act in conservative way - address possibly overlaps with stack area of interest, and we should not perform tailcall optimization ChangeLog entry: 2011-07-06 Kirill Yukhin <kirill.yukhin@intel.com> PR middle-end/49519 * calls.c (mem_overlaps_already_clobbered_arg_p): Additional check if address is stored in register. If so - give up. (check_sibcall_argument_overlap_1): Do not perform check of overlapping when it is call to address. tessuite/ChangeLog entry: 2011-07-06 Kirill Yukhin <kirill.yukhin@intel.com> * g++.dg/torture/pr49519.C: New test for tailcall fix. Bootstrapped, new test fails without patch, passes when it is applied. This fixes the problem with SPEC2006/447.dealII miscompile Ok for trunk? Thanks, K
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