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Diffstat (limited to 'sysdeps/m68k/fpu/__math.h')
-rw-r--r--sysdeps/m68k/fpu/__math.h21
1 files changed, 20 insertions, 1 deletions
diff --git a/sysdeps/m68k/fpu/__math.h b/sysdeps/m68k/fpu/__math.h
index 92487f9b04..5dc4d2e066 100644
--- a/sysdeps/m68k/fpu/__math.h
+++ b/sysdeps/m68k/fpu/__math.h
@@ -153,6 +153,21 @@ __internal_inline_functions (float,f)
__internal_inline_functions (long double,l)
#undef __internal_inline_functions
+/* Get the m68881 condition codes, to quickly check multiple conditions. */
+static __inline__ unsigned long
+__m81_test (long double __val)
+{
+ unsigned long __fpsr;
+ __asm ("ftst%.x %1; fmove%.l %/fpsr,%0" : "=dm" (__fpsr) : "f" (__val));
+ return __fpsr;
+}
+
+/* Bit values returned by __m81_test. */
+#define __M81_COND_NAN (1 << 24)
+#define __M81_COND_INF (2 << 24)
+#define __M81_COND_ZERO (4 << 24)
+#define __M81_COND_NEG (8 << 24)
+
#endif /* __LIBC_M81_MATH_INLINES */
/* The rest of the functions are available to the user. */
@@ -163,8 +178,12 @@ __m81_u(__CONCAT(__frexp,s))(float_type __value, int *__expptr) \
{ \
float_type __mantissa, __exponent; \
int __iexponent; \
- if (__value == 0.0) \
+ unsigned long __fpsr; \
+ __asm("ftst%.x %1\n" \
+ "fmove%.l %/fpsr, %0" : "=dm" (__fpsr) : "f" (__value)); \
+ if (__fpsr & (7 << 24)) \
{ \
+ /* Not finite or zero. */ \
*__expptr = 0; \
return __value; \
} \