diff options
Diffstat (limited to 'sysdeps/x86_64/fpu')
| -rw-r--r-- | sysdeps/x86_64/fpu/math_private.h | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/sysdeps/x86_64/fpu/math_private.h b/sysdeps/x86_64/fpu/math_private.h index 3289afc58b..aa208b2e18 100644 --- a/sysdeps/x86_64/fpu/math_private.h +++ b/sysdeps/x86_64/fpu/math_private.h @@ -108,13 +108,33 @@ libc_fesetenv (fenv_t *e) #define libc_fesetenv libc_fesetenv #define libc_fesetenvf libc_fesetenv +static __always_inline int +libc_feupdateenv_test (fenv_t *e, int ex) +{ + unsigned int mxcsr, old_mxcsr, cur_ex; + asm volatile (STMXCSR " %0" : "=m" (*&mxcsr)); + cur_ex = mxcsr & FE_ALL_EXCEPT; + + /* Merge current exceptions with the old environment. */ + old_mxcsr = e->__mxcsr; + mxcsr = old_mxcsr | cur_ex; + asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr)); + + /* Raise SIGFPE for any new exceptions since the hold. Expect that + the normal environment has all exceptions masked. */ + if (__builtin_expect ((old_mxcsr >> 7) & cur_ex, 0)) + __feraiseexcept (cur_ex); + + /* Test for exceptions raised since the hold. */ + return cur_ex & ex; +} +#define libc_feupdateenv_test libc_feupdateenv_test +#define libc_feupdateenv_testf libc_feupdateenv_test + static __always_inline void libc_feupdateenv (fenv_t *e) { - unsigned int mxcsr; - asm volatile (STMXCSR " %0" : "=m" (*&mxcsr)); - asm volatile (LDMXCSR " %0" : : "m" ((e)->__mxcsr)); - __feraiseexcept (mxcsr & FE_ALL_EXCEPT); + libc_feupdateenv_test (e, 0); } #define libc_feupdateenv libc_feupdateenv #define libc_feupdateenvf libc_feupdateenv |