PERFORCE change 105541 for review
Oleksandr Tymoshenko
gonzo at FreeBSD.org
Sat Sep 2 16:11:02 UTC 2006
http://perforce.freebsd.org/chv.cgi?CH=105541
Change 105541 by gonzo at gonzo_hideout on 2006/09/02 16:10:19
o Threw away amd64 floating point legacy.
Affected files ...
.. //depot/projects/mips2/src/sys/mips/include/ieeefp.h#2 edit
Differences ...
==== //depot/projects/mips2/src/sys/mips/include/ieeefp.h#2 (text+ko) ====
@@ -46,235 +46,20 @@
#error this file needs sys/cdefs.h as a prerequisite
#endif
-/*
- * FP rounding modes
- */
+typedef int fp_except;
+#define FP_X_IMP 0x01 /* imprecise (loss of precision) */
+#define FP_X_UFL 0x02 /* underflow exception */
+#define FP_X_OFL 0x04 /* overflow exception */
+#define FP_X_DZ 0x08 /* divide-by-zero exception */
+#define FP_X_INV 0x10 /* invalid operation exception */
+
typedef enum {
- FP_RN=0, /* round to nearest */
- FP_RM, /* round down to minus infinity */
- FP_RP, /* round up to plus infinity */
- FP_RZ /* truncate */
+ FP_RN=0, /* round to nearest representable number */
+ FP_RZ=1, /* round to zero (truncate) */
+ FP_RP=2, /* round toward positive infinity */
+ FP_RM=3 /* round toward negative infinity */
} fp_rnd_t;
-/*
- * FP precision modes
- */
-typedef enum {
- FP_PS=0, /* 24 bit (single-precision) */
- FP_PRS, /* reserved */
- FP_PD, /* 53 bit (double-precision) */
- FP_PE /* 64 bit (extended-precision) */
-} fp_prec_t;
-
#define fp_except_t int
-/*
- * FP exception masks
- */
-#define FP_X_INV 0x01 /* invalid operation */
-#define FP_X_DNML 0x02 /* denormal */
-#define FP_X_DZ 0x04 /* zero divide */
-#define FP_X_OFL 0x08 /* overflow */
-#define FP_X_UFL 0x10 /* underflow */
-#define FP_X_IMP 0x20 /* (im)precision */
-#define FP_X_STK 0x40 /* stack fault */
-
-/*
- * FP registers
- */
-#define FP_MSKS_REG 0 /* exception masks */
-#define FP_PRC_REG 0 /* precision */
-#define FP_RND_REG 0 /* direction */
-#define FP_STKY_REG 1 /* sticky flags */
-
-/*
- * FP register bit field masks
- */
-#define FP_MSKS_FLD 0x3f /* exception masks field */
-#define FP_PRC_FLD 0x300 /* precision control field */
-#define FP_RND_FLD 0xc00 /* round control field */
-#define FP_STKY_FLD 0x3f /* sticky flags field */
-
-/*
- * SSE mxcsr register bit field masks
- */
-#define SSE_STKY_FLD 0x3f /* exception flags */
-#define SSE_DAZ_FLD 0x40 /* Denormals are zero */
-#define SSE_MSKS_FLD 0x1f80 /* exception masks field */
-#define SSE_RND_FLD 0x6000 /* rounding control */
-#define SSE_FZ_FLD 0x8000 /* flush to zero on underflow */
-
-/*
- * FP register bit field offsets
- */
-#define FP_MSKS_OFF 0 /* exception masks offset */
-#define FP_PRC_OFF 8 /* precision control offset */
-#define FP_RND_OFF 10 /* round control offset */
-#define FP_STKY_OFF 0 /* sticky flags offset */
-
-/*
- * SSE mxcsr register bit field offsets
- */
-#define SSE_STKY_OFF 0 /* exception flags offset */
-#define SSE_DAZ_OFF 6 /* DAZ exception mask offset */
-#define SSE_MSKS_OFF 7 /* other exception masks offset */
-#define SSE_RND_OFF 13 /* rounding control offset */
-#define SSE_FZ_OFF 15 /* flush to zero offset */
-
-#if defined(__GNUCLIKE_ASM) && defined(__CC_SUPPORTS___INLINE__) \
- && !defined(__cplusplus)
-
-#define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr)))
-#define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr)))
-#define __fldcw(addr) __asm __volatile("fldcw %0" : : "m" (*(addr)))
-#define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr)))
-#define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr)))
-#define __ldmxcsr(addr) __asm __volatile("ldmxcsr %0" : : "m" (*(addr)))
-#define __stmxcsr(addr) __asm __volatile("stmxcsr %0" : "=m" (*(addr)))
-
-/*
- * General notes about conflicting SSE vs FP status bits.
- * This code assumes that software will not fiddle with the control
- * bits of the SSE and x87 in such a way to get them out of sync and
- * still expect this to work. Break this at your peril.
- * Because I based this on the i386 port, the x87 state is used for
- * the fpget*() functions, and is shadowed into the SSE state for
- * the fpset*() functions. For dual source fpget*() functions, I
- * merge the two together. I think.
- */
-
-/* Set rounding control */
-static __inline__ fp_rnd_t
-__fpgetround(void)
-{
- unsigned short _cw;
-
- __fnstcw(&_cw);
- return ((_cw & FP_RND_FLD) >> FP_RND_OFF);
-}
-
-static __inline__ fp_rnd_t
-__fpsetround(fp_rnd_t _m)
-{
- unsigned short _cw;
- unsigned int _mxcsr;
- fp_rnd_t _p;
-
- __fnstcw(&_cw);
- _p = (_cw & FP_RND_FLD) >> FP_RND_OFF;
- _cw &= ~FP_RND_FLD;
- _cw |= (_m << FP_RND_OFF) & FP_RND_FLD;
- __fldcw(&_cw);
- __stmxcsr(&_mxcsr);
- _mxcsr &= ~SSE_RND_FLD;
- _mxcsr |= (_m << SSE_RND_OFF) & SSE_RND_FLD;
- __ldmxcsr(&_mxcsr);
- return (_p);
-}
-
-/*
- * Set precision for fadd/fsub/fsqrt etc x87 instructions
- * There is no equivalent SSE mode or control.
- */
-static __inline__ fp_prec_t
-__fpgetprec(void)
-{
- unsigned short _cw;
-
- __fnstcw(&_cw);
- return ((_cw & FP_PRC_FLD) >> FP_PRC_OFF);
-}
-
-static __inline__ fp_prec_t
-__fpsetprec(fp_rnd_t _m)
-{
- unsigned short _cw;
- fp_prec_t _p;
-
- __fnstcw(&_cw);
- _p = (_cw & FP_PRC_FLD) >> FP_PRC_OFF;
- _cw &= ~FP_PRC_FLD;
- _cw |= (_m << FP_PRC_OFF) & FP_PRC_FLD;
- __fldcw(&_cw);
- return (_p);
-}
-
-/*
- * Look at the exception masks
- * Note that x87 masks are inverse of the fp*() functions
- * API. ie: mask = 1 means disable for x87 and SSE, but
- * for the fp*() api, mask = 1 means enabled.
- */
-static __inline__ fp_except_t
-__fpgetmask(void)
-{
- unsigned short _cw;
-
- __fnstcw(&_cw);
- return ((~_cw) & FP_MSKS_FLD);
-}
-
-static __inline__ fp_except_t
-__fpsetmask(fp_except_t _m)
-{
- unsigned short _cw;
- unsigned int _mxcsr;
- fp_except_t _p;
-
- __fnstcw(&_cw);
- _p = (~_cw) & FP_MSKS_FLD;
- _cw &= ~FP_MSKS_FLD;
- _cw |= (~_m) & FP_MSKS_FLD;
- __fldcw(&_cw);
- __stmxcsr(&_mxcsr);
- /* XXX should we clear non-ieee SSE_DAZ_FLD and SSE_FZ_FLD ? */
- _mxcsr &= ~SSE_MSKS_FLD;
- _mxcsr |= ((~_m) << SSE_MSKS_OFF) & SSE_MSKS_FLD;
- __ldmxcsr(&_mxcsr);
- return (_p);
-}
-
-/* See which sticky exceptions are pending, and reset them */
-static __inline__ fp_except_t
-__fpgetsticky(void)
-{
- unsigned short _sw;
- unsigned int _mxcsr;
- fp_except_t _ex;
-
- __fnstsw(&_sw);
- _ex = _sw & FP_STKY_FLD;
- __stmxcsr(&_mxcsr);
- _ex |= _mxcsr & SSE_STKY_FLD;
- return (_ex);
-}
-
-#endif /* __GNUCLIKE_ASM && __CC_SUPPORTS___INLINE__ && !__cplusplus */
-
-#if !defined(__IEEEFP_NOINLINES__) && !defined(__cplusplus) \
- && defined(__GNUCLIKE_ASM) && defined(__CC_SUPPORTS___INLINE__)
-
-#define fpgetround() __fpgetround()
-#define fpsetround(_m) __fpsetround(_m)
-#define fpgetprec() __fpgetprec()
-#define fpsetprec(_m) __fpsetprec(_m)
-#define fpgetmask() __fpgetmask()
-#define fpsetmask(_m) __fpsetmask(_m)
-#define fpgetsticky() __fpgetsticky()
-
-/* Suppress prototypes in the MI header. */
-#define _IEEEFP_INLINED_ 1
-
-#else /* !__IEEEFP_NOINLINES__ && !__cplusplus && __GNUCLIKE_ASM
- && __CC_SUPPORTS___INLINE__ */
-
-/* Augment the userland declarations */
-__BEGIN_DECLS
-extern fp_prec_t fpgetprec(void);
-extern fp_prec_t fpsetprec(fp_prec_t);
-__END_DECLS
-
-#endif /* !__IEEEFP_NOINLINES__ && !__cplusplus && __GNUCLIKE_ASM
- && __CC_SUPPORTS___INLINE__ */
-
#endif /* !_MACHINE_IEEEFP_H_ */
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