diff options
Diffstat (limited to 'ports/sysdeps/mips/fpu_control.h')
| -rw-r--r-- | ports/sysdeps/mips/fpu_control.h | 33 |
1 files changed, 24 insertions, 9 deletions
diff --git a/ports/sysdeps/mips/fpu_control.h b/ports/sysdeps/mips/fpu_control.h index 770cbb31d8..ee774153f2 100644 --- a/ports/sysdeps/mips/fpu_control.h +++ b/ports/sysdeps/mips/fpu_control.h @@ -29,7 +29,9 @@ * available for MIPS III and newer. * 23 -> Condition bit * 22-21 -> reserved for architecture implementers - * 20-18 -> reserved (read as 0, write with 0) + * 20 -> reserved (read as 0, write with 0) + * 19 -> IEEE 754-2008 non-arithmetic ABS.fmt and NEG.fmt enable + * 18 -> IEEE 754-2008 recommended NaN encoding enable * 17 -> cause bit for unimplemented operation * 16 -> cause bit for invalid exception * 15 -> cause bit for division by zero exception @@ -69,32 +71,45 @@ extern fpu_control_t __fpu_control; #else /* __mips_soft_float */ -/* masking of interrupts */ +/* Masks for interrupts. */ #define _FPU_MASK_V 0x0800 /* Invalid operation */ #define _FPU_MASK_Z 0x0400 /* Division by zero */ #define _FPU_MASK_O 0x0200 /* Overflow */ #define _FPU_MASK_U 0x0100 /* Underflow */ #define _FPU_MASK_I 0x0080 /* Inexact operation */ -/* flush denormalized numbers to zero */ +/* Flush denormalized numbers to zero. */ #define _FPU_FLUSH_TZ 0x1000000 -/* rounding control */ +/* IEEE 754-2008 compliance control. */ +#define _FPU_ABS2008 0x80000 +#define _FPU_NAN2008 0x40000 + +/* Rounding control. */ #define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */ #define _FPU_RC_ZERO 0x1 #define _FPU_RC_UP 0x2 #define _FPU_RC_DOWN 0x3 +/* Mask for rounding control. */ +#define _FPU_RC_MASK 0x3 -#define _FPU_RESERVED 0xfe9c0000 /* Reserved bits in cw */ +#define _FPU_RESERVED 0xfe840000 /* Reserved bits in cw, incl NAN2008. */ /* The fdlibm code requires strict IEEE double precision arithmetic, and no interrupts for exceptions, rounding to nearest. */ +#ifdef __mips_nan2008 +# define _FPU_DEFAULT 0x00040000 +#else +# define _FPU_DEFAULT 0x00000000 +#endif -#define _FPU_DEFAULT 0x00000000 - -/* IEEE: same as above, but exceptions */ -#define _FPU_IEEE 0x00000F80 +/* IEEE: same as above, but exceptions. */ +#ifdef __mips_nan2008 +# define _FPU_IEEE 0x00040F80 +#else +# define _FPU_IEEE 0x00000F80 +#endif /* Type of the control word. */ typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__))); |