[Bug middle-end/47917] snprintf(..., "const string") should be optimized into memcpy

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47917

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-03-14 
20:30:29 UTC ---
Author: jakub
Date: Mon Mar 14 20:30:24 2011
New Revision: 170959

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=170959
Log:
    PR middle-end/47917
    * builtins.c (fold_builtin_snprintf): New function.
    (fold_builtin_3): Call it for BUILT_IN_SNPRINTF.
    (fold_builtin_4): Likewise.

    * gcc.c-torture/execute/pr47917.c: New test.
    * gcc.dg/pr47917.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr47917.c
    trunk/gcc/testsuite/gcc.dg/pr47917.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/builtins.c
    trunk/gcc/testsuite/ChangeLog