diff options
| author | Ian Bolton <ian.bolton@arm.com> | 2014-04-24 07:15:33 +0100 |
|---|---|---|
| committer | Marcus Shawcroft <marcus.shawcroft@linaro.org> | 2014-04-24 07:15:33 +0100 |
| commit | e5e0d9a4f632735cf3bb440eecb5caee5eea44c1 (patch) | |
| tree | 51c5774783bb0479b35a33f9a22b86db00c20cbe /sysdeps/aarch64/fpu/feholdexcpt.c | |
| parent | bacc75f7be11656387c239831f490155f5fb3700 (diff) | |
| download | glibc-e5e0d9a4f632735cf3bb440eecb5caee5eea44c1.tar.gz | |
[AArch64] Suppress unnecessary FPSR and FPCR writes.
Diffstat (limited to 'sysdeps/aarch64/fpu/feholdexcpt.c')
| -rw-r--r-- | sysdeps/aarch64/fpu/feholdexcpt.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/sysdeps/aarch64/fpu/feholdexcpt.c b/sysdeps/aarch64/fpu/feholdexcpt.c index 0514ac15b5..973ba4a56a 100644 --- a/sysdeps/aarch64/fpu/feholdexcpt.c +++ b/sysdeps/aarch64/fpu/feholdexcpt.c @@ -22,8 +22,10 @@ int feholdexcept (fenv_t *envp) { - fpu_fpsr_t fpsr; fpu_control_t fpcr; + fpu_control_t fpcr_new; + fpu_fpsr_t fpsr; + fpu_fpsr_t fpsr_new; _FPU_GETCW (fpcr); envp->__fpcr = fpcr; @@ -32,14 +34,16 @@ feholdexcept (fenv_t *envp) envp->__fpsr = fpsr; /* Now set all exceptions to non-stop. */ - fpcr &= ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT); + fpcr_new = fpcr & ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT); /* And clear all exception flags. */ - fpsr &= ~FE_ALL_EXCEPT; + fpsr_new = fpsr & ~FE_ALL_EXCEPT; - _FPU_SETFPSR (fpsr); + if (fpsr != fpsr_new) + _FPU_SETFPSR (fpsr_new); - _FPU_SETCW (fpcr); + if (fpcr != fpcr_new) + _FPU_SETCW (fpcr_new); return 0; } |