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Writes to fpsr and fpcr are expensive. This patch adds checks before each write to ensure we only write new values to them (as opposed to rewriting what's there). Tested with make check and make bench, with no regressions. OK for commit? Cheers, Ian 2014-04-24 Ian Bolton <ian.bolton@arm.com> * sysdeps/aarch64/fpu/fclrexcpt.c (feclearexcept): Don't write to fpsr if value didn't change. * sysdeps/aarch64/fpu/fedisblxcpt.c (fedisableexcept): Don't write to fpcr if value didn't change. * sysdeps/aarch64/fpu/feenablxcpt.c (feenableexcept): Likewise. * sysdeps/aarch64/fpu/feholdexcpt.c (feholdexcept): Don't write to fpsr or fpcr if value didn't change. * sysdeps/aarch64/fpu/fesetenv.c (fesetenv): Likewise. * sysdeps/aarch64/fpu/fesetround.c (fesetround): Don't write to fpcr if value didn't change. * sysdeps/aarch64/fpu/fsetexcptflg.c (fesetexceptflag): Don't write to fpsr if value didn't change.
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glibc_suppress_fpcr_fpsr_writes_patch.txt
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