http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57018
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-22 08:10:04 UTC --- In bar in the more reduced testcase, the second rep_movsi insn uses before reload argp as the source address of the 16 byte copy. The argp to stack pointer elimination offset is 16, 2x saved registers (%esi/%edi), caller's address and 4 bytes of padding. But the place where this argp is used is in between fn argument allocation (sp = sp - 16) and deallocation (sp = sp + 16), i.e. REG_ARGS_SIZE at that point is 16, thus the code really should have leal 32(%esp), %esi instead of leal 16(%esp), %esi to point to the argp area.
