Hi Mike, On Fri, Nov 11, 2011 at 4:04 PM, Mike Frysinger <vap...@gentoo.org> wrote: > On Thursday 10 November 2011 23:49:07 Graeme Russ wrote: >> Remember, U-Boot uses --no-builtin, so apart from the libgcc functions, >> there are no gcc functions included. > > i don't think that's generally how gcc builtin's work. for the vast majority, > they're of the "optimize away with simple insns when possible" variety. so if > you do something like: > char c[4]; > memset(c, 0, sizeof(c)); > gcc will optimize that into a single 32bit load rather than calling memcpy(). > but because we use -fno-builtins, gcc will make sure to call memcpy().
List of builtin functions not in libgcc: http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html > i can't think of any calls off the top of my head which would result in > invoking a func in libgcc.a. Any function listed here: http://gcc.gnu.org/onlinedocs/gccint/Libgcc.html But we can discount any float/double routines, exception handling and split stack which leaves just: http://gcc.gnu.org/onlinedocs/gccint/Integer-library-routines.html Regards, Graeme _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
