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2002-06-03 Chris Demetriou <cgd@broadcom.com>

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* cp1.c: Clean up comments which describe FP formats.
	 (FPQNaN_DOUBLE, FPQNaN_LONG): Generate using UNSIGNED64.
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Chris Demetriou 2002-06-03 22:05:15 +00:00
parent 7cbea0890e
commit bad673a9cb
2 changed files with 30 additions and 24 deletions
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5
sim/mips/ChangeLog
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@ -1,3 +1,8 @@
2002-06-03 Chris Demetriou <cgd@broadcom.com>
* cp1.c: Clean up comments which describe FP formats.
(FPQNaN_DOUBLE, FPQNaN_LONG): Generate using UNSIGNED64.
2002-06-03 Chris Demetriou <cgd@broadcom.com>
Ed Satterthwaite <ehs@broadcom.com>

49
sim/mips/cp1.c
View File

@ -26,35 +26,36 @@
/*-- FPU support routines ---------------------------------------------------*/
/* Numbers are held in normalized form. The SINGLE and DOUBLE binary
formats conform to ANSI/IEEE Std 754-1985. */
/* SINGLE precision floating:
* seeeeeeeefffffffffffffffffffffff
* s = 1bit = sign
* e = 8bits = exponent
* f = 23bits = fraction
*/
/* SINGLE precision fixed:
* siiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
* s = 1bit = sign
* i = 31bits = integer
*/
/* DOUBLE precision floating:
* seeeeeeeeeeeffffffffffffffffffffffffffffffffffffffffffffffffffff
* s = 1bit = sign
* e = 11bits = exponent
* f = 52bits = fraction
*/
/* DOUBLE precision fixed:
* siiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
* s = 1bit = sign
* i = 63bits = integer
formats conform to ANSI/IEEE Std 754-1985.
SINGLE precision floating:
seeeeeeeefffffffffffffffffffffff
s = 1bit = sign
e = 8bits = exponent
f = 23bits = fraction
SINGLE precision fixed:
siiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
s = 1bit = sign
i = 31bits = integer
DOUBLE precision floating:
seeeeeeeeeeeffffffffffffffffffffffffffffffffffffffffffffffffffff
s = 1bit = sign
e = 11bits = exponent
f = 52bits = fraction
DOUBLE precision fixed:
siiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
s = 1bit = sign
i = 63bits = integer
*/
/* Explicit QNaN values used when value required: */
#define FPQNaN_SINGLE (0x7FBFFFFF)
#define FPQNaN_WORD (0x7FFFFFFF)
#define FPQNaN_DOUBLE ((((uword64) 0x7FF7FFFF) << 32) | 0xFFFFFFFF)
#define FPQNaN_LONG ((((uword64) 0x7FFFFFFF) << 32) | 0xFFFFFFFF)
#define FPQNaN_DOUBLE (UNSIGNED64 (0x7FF7FFFFFFFFFFFF))
#define FPQNaN_LONG (UNSIGNED64 (0x7FFFFFFFFFFFFFFF))
static const char *fpu_format_name (FP_formats fmt);
#ifdef DEBUG