On Mon, Dec 8, 2014 at 9:18 AM, Segher Boessenkool <seg...@kernel.crashing.org> wrote: > A lot of old user code clobbers the carry bit without telling the compiler > about it. This used to just work, because the compiler never used the bit > outside of a single RTL instruction. But that will change. Let's clobber > the carry bit in every asm; this isn't very expensive. > > > 2014-12-08 Segher Boessenkool <seg...@kernel.crashing.org> > > gcc/ > PR target/64180 > * config/rs6000/rs6000.c (TARGET_MD_ASM_CLOBBERS): Define. > (rs6000_md_asm_clobbers): New function.
Okay. I don't know of another option that preserves backward compatibility. If RTH looks at this series of patches, he may have a better suggestion. Thanks, David
