This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |
Other format: | [Raw text] |
On Fri, Dec 28, 2012 at 9:27 PM, Richard Henderson <rth@redhat.com> wrote: > On 12/27/2012 12:08 AM, Uros Bizjak wrote: >> The alternative approach is changing cpuid definition in cpuid.h (as >> in attached patch) to preserve %rbx, but we can't detect various code >> model settings there. Since the change depends on the definition of >> __PIC__, we unnecessary preserve %rbx also for -mcmodel=small. > > Certainly we can. We also control the preprocessor defines. > All that's needed is that we create one for the code model. Something like attached? I have also included all suggestions (earlyclobber and operand prefix on temporary register). 2012-12-30 Uros Bizjak <ubizjak@gmail.com> PR target/55712 * config/i386/i386-c.c (ix86_target_macros_internal): Depending on selected code model, define __code_mode_small__, __code_model_medium__, __code_model_large__, __code_model_32__ or __code_model_kernel__. * config/i386/cpuid.h (__cpuid, __cpuid_count) [__i386__]: Prefix xchg temporary register with %k. Declare temporary register as early clobbered. [__x86_64__]: For medium and large code models, preserve %rbx register. Tested on x86_64-pc-linux-gnu {,-m32}. Uros.
Attachment:
p.diff.txt
Description: Text document
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |