diff options
Diffstat (limited to 'libc/ports/sysdeps/mips/bits/nan.h')
| -rw-r--r-- | libc/ports/sysdeps/mips/bits/nan.h | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/libc/ports/sysdeps/mips/bits/nan.h b/libc/ports/sysdeps/mips/bits/nan.h index 80f7866a9..c32252327 100644 --- a/libc/ports/sysdeps/mips/bits/nan.h +++ b/libc/ports/sysdeps/mips/bits/nan.h @@ -22,10 +22,11 @@ /* IEEE Not A Number. */ -/* Note that MIPS has the qNaN and sNaN patterns reversed compared to most - other architectures. IEEE 754-1985 left the definition of this open to - implementations, and for MIPS the top bit of the mantissa must be SET to - indicate a sNaN. */ +/* In legacy-NaN mode MIPS has the qNaN and sNaN patterns reversed + compared to most other architectures. IEEE 754-1985 left the + definition of this open to implementations, and for MIPS the top bit + of the mantissa must be SET to indicate a sNaN. In 2008-NaN mode + MIPS aligned to IEEE 754-2008. */ #if __GNUC_PREREQ(3,3) @@ -33,6 +34,8 @@ #elif defined __GNUC__ +/* No 2008-NaN mode support in any GCC version before 4.9. */ + # define NAN \ (__extension__ \ ((union { unsigned __l __attribute__ ((__mode__ (__SI__))); float __d; }) \ @@ -43,10 +46,18 @@ # include <endian.h> # if __BYTE_ORDER == __BIG_ENDIAN -# define __qnan_bytes { 0x7f, 0xbf, 0xff, 0xff } +# ifdef __mips_nan2008 +# define __qnan_bytes { 0x7f, 0xc0, 0, 0 } +# else +# define __qnan_bytes { 0x7f, 0xbf, 0xff, 0xff } +# endif # endif # if __BYTE_ORDER == __LITTLE_ENDIAN -# define __qnan_bytes { 0xff, 0xff, 0xbf, 0x7f } +# ifdef __mips_nan2008 +# define __qnan_bytes { 0, 0, 0xc0, 0x7f } +# else +# define __qnan_bytes { 0xff, 0xff, 0xbf, 0x7f } +# endif # endif static union { unsigned char __c[4]; float __d; } __qnan_union |