diff options
Diffstat (limited to 'sysdeps/m68k/fpu/fraiseexcpt.c')
| -rw-r--r-- | sysdeps/m68k/fpu/fraiseexcpt.c | 34 |
1 files changed, 31 insertions, 3 deletions
diff --git a/sysdeps/m68k/fpu/fraiseexcpt.c b/sysdeps/m68k/fpu/fraiseexcpt.c index 51411dd292..d509604e28 100644 --- a/sysdeps/m68k/fpu/fraiseexcpt.c +++ b/sysdeps/m68k/fpu/fraiseexcpt.c @@ -48,15 +48,43 @@ feraiseexcept (int excepts) /* Next: overflow. */ if (excepts & FE_OVERFLOW) { + /* We cannot raise the overflow exception without also setting the + inexact flag. Restore it after the operation, unless it should + be set anyway. */ long double d = LDBL_MAX; - __asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d)); + fexcept_t fpsr; + + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + __asm__ __volatile__ ("fmul%.x %0,%0" : "=f" (d) : "0" (d)); + if (!((excepts | fpsr) & FE_INEXACT)) + { + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + fpsr &= ~FE_INEXACT; + __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr)); + } + else + __asm__ ("fnop"); } /* Next: underflow. */ if (excepts & FE_UNDERFLOW) { - long double d = LDBL_MIN; - __asm__ __volatile__ ("fdiv%.s %#0r16,%0; fnop" : "=f" (d) : "0" (d)); + /* We cannot raise the underflow exception without also setting the + inexact flag. Restore it after the operation, unless it should + be set anyway. */ + long double d = -LDBL_MAX; + fexcept_t fpsr; + + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + __asm__ __volatile__ ("fetox%.x %0" : "=f" (d) : "0" (d)); + if (!((excepts | fpsr) & FE_INEXACT)) + { + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + fpsr &= ~FE_INEXACT; + __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr)); + } + else + __asm__ ("fnop"); } /* Last: inexact. */ |