longlong.h

C++ 编写的EROS RTOS

/* longlong.h -- definitions for mixed size 32/64 bit arithmetic.
   Copyright (C) 1991, 1992, 1994, 1995 Free Software Foundation, Inc.

   This definition file is free software; you can redistribute it
   and/or modify it under the terms of the GNU General Public
   License as published by the Free Software Foundation; either
   version 2, or (at your option) any later version.

   This definition file is distributed in the hope that it will be
   useful, but WITHOUT ANY WARRANTY; without even the implied
   warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   See the GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifndef SI_TYPE_SIZE
#define SI_TYPE_SIZE 32
#endif

#define __BITS4 (SI_TYPE_SIZE / 4)
#define __ll_B (1L << (SI_TYPE_SIZE / 2))
#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
#define __ll_highpart(t) ((USItype) (t) / __ll_B)

/* Define auxiliary asm macros.

   1) umul_ppmm(high_prod, low_prod, multipler, multiplicand)
   multiplies two USItype integers MULTIPLER and MULTIPLICAND,
   and generates a two-part USItype product in HIGH_PROD and
   LOW_PROD.

   2) __umulsidi3(a,b) multiplies two USItype integers A and B,
   and returns a UDItype product.  This is just a variant of umul_ppmm.

   3) udiv_qrnnd(quotient, remainder, high_numerator, low_numerator,
   denominator) divides a two-word unsigned integer, composed by the
   integers HIGH_NUMERATOR and LOW_NUMERATOR, by DENOMINATOR and
   places the quotient in QUOTIENT and the remainder in REMAINDER.
   HIGH_NUMERATOR must be less than DENOMINATOR for correct operation.
   If, in addition, the most significant bit of DENOMINATOR must be 1,
   then the pre-processor symbol UDIV_NEEDS_NORMALIZATION is defined to 1.

   4) sdiv_qrnnd(quotient, remainder, high_numerator, low_numerator,
   denominator).  Like udiv_qrnnd but the numbers are signed.  The
   quotient is rounded towards 0.

   5) count_leading_zeros(count, x) counts the number of zero-bits from
   the msb to the first non-zero bit.  This is the number of steps X
   needs to be shifted left to set the msb.  Undefined for X == 0.

   6) add_ssaaaa(high_sum, low_sum, high_addend_1, low_addend_1,
   high_addend_2, low_addend_2) adds two two-word unsigned integers,
   composed by HIGH_ADDEND_1 and LOW_ADDEND_1, and HIGH_ADDEND_2 and
   LOW_ADDEND_2 respectively.  The result is placed in HIGH_SUM and
   LOW_SUM.  Overflow (i.e. carry out) is not stored anywhere, and is
   lost.

   7) sub_ddmmss(high_difference, low_difference, high_minuend,
   low_minuend, high_subtrahend, low_subtrahend) subtracts two
   two-word unsigned integers, composed by HIGH_MINUEND_1 and
   LOW_MINUEND_1, and HIGH_SUBTRAHEND_2 and LOW_SUBTRAHEND_2
   respectively.  The result is placed in HIGH_DIFFERENCE and
   LOW_DIFFERENCE.  Overflow (i.e. carry out) is not stored anywhere,
   and is lost.

   If any of these macros are left undefined for a particular CPU,
   C macros are used.  */

/* The CPUs come in alphabetical order below.

   Please add support for more CPUs here, or improve the current support
   for the CPUs below!
   (E.g. WE32100, IBM360.)  */

#if defined (__GNUC__) && !defined (NO_ASM)

/* We sometimes need to clobber "cc" with gcc2, but that would not be
   understood by gcc1.  Use cpp to avoid major code duplication.  */
#if __GNUC__ < 2
#define __CLOBBER_CC
#define __AND_CLOBBER_CC
#else /* __GNUC__ >= 2 */
#define __CLOBBER_CC : "cc"
#define __AND_CLOBBER_CC , "cc"
#endif /* __GNUC__ < 2 */

#if defined (__a29k__) || defined (_AM29K)
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
  __asm__ ("add %1,%4,%5
	addc %0,%2,%3"							\
	   : "=r" ((USItype)(sh)),					\
	    "=&r" ((USItype)(sl))					\
	   : "%r" ((USItype)(ah)),					\
	     "rI" ((USItype)(bh)),					\
	     "%r" ((USItype)(al)),					\
	     "rI" ((USItype)(bl)))
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
  __asm__ ("sub %1,%4,%5
	subc %0,%2,%3"							\
	   : "=r" ((USItype)(sh)),					\
	     "=&r" ((USItype)(sl))					\
	   : "r" ((USItype)(ah)),					\
	     "rI" ((USItype)(bh)),					\
	     "r" ((USItype)(al)),					\
	     "rI" ((USItype)(bl)))
#define umul_ppmm(xh, xl, m0, m1) \
  do {									\
    USItype __m0 = (m0), __m1 = (m1);					\
    __asm__ ("multiplu %0,%1,%2"					\
	     : "=r" ((USItype)(xl))					\
	     : "r" (__m0),						\
	       "r" (__m1));						\
    __asm__ ("multmu %0,%1,%2"						\
	     : "=r" ((USItype)(xh))					\
	     : "r" (__m0),						\
	       "r" (__m1));						\
  } while (0)
#define udiv_qrnnd(q, r, n1, n0, d) \
  __asm__ ("dividu %0,%3,%4"						\
	   : "=r" ((USItype)(q)),					\
	     "=q" ((USItype)(r))					\
	   : "1" ((USItype)(n1)),					\
	     "r" ((USItype)(n0)),					\
	     "r" ((USItype)(d)))
#define count_leading_zeros(count, x) \
    __asm__ ("clz %0,%1"						\
	     : "=r" ((USItype)(count))					\
	     : "r" ((USItype)(x)))
#endif /* __a29k__ */

#if defined (__arm__)
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
  __asm__ ("adds	%1, %4, %5
	adc	%0, %2, %3"						\
	   : "=r" ((USItype)(sh)),					\
	     "=&r" ((USItype)(sl))					\
	   : "%r" ((USItype)(ah)),					\
	     "rI" ((USItype)(bh)),					\
	     "%r" ((USItype)(al)),					\
	     "rI" ((USItype)(bl)))
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
  __asm__ ("subs	%1, %4, %5
	sbc	%0, %2, %3"						\
	   : "=r" ((USItype)(sh)),					\
	     "=&r" ((USItype)(sl))					\
	   : "r" ((USItype)(ah)),					\
	     "rI" ((USItype)(bh)),					\
	     "r" ((USItype)(al)),					\
	     "rI" ((USItype)(bl)))
#define umul_ppmm(xh, xl, a, b) \
{register USItype __t0, __t1, __t2;					\
  __asm__ ("%@ Inlined umul_ppmm
	mov	%2, %5, lsr #16
	mov	%0, %6, lsr #16
	bic	%3, %5, %2, lsl #16
	bic	%4, %6, %0, lsl #16
	mul	%1, %3, %4
	mul	%4, %2, %4
	mul	%3, %0, %3
	mul	%0, %2, %0
	adds	%3, %4, %3
	addcs	%0, %0, #65536
	adds	%1, %1, %3, lsl #16
	adc	%0, %0, %3, lsr #16"					\
	   : "=&r" ((USItype)(xh)),					\
	     "=r" ((USItype)(xl)),					\
	     "=&r" (__t0), "=&r" (__t1), "=r" (__t2)			\
	   : "r" ((USItype)(a)),					\
	     "r" ((USItype)(b)));}
#define UMUL_TIME 20
#define UDIV_TIME 100
#endif /* __arm__ */

#if defined (__clipper__)
#define umul_ppmm(w1, w0, u, v) \
  ({union {UDItype __ll;						\
	   struct {USItype __l, __h;} __i;				\
	  } __xx;							\
  __asm__ ("mulwux %2,%0"						\
	   : "=r" (__xx.__ll)						\
	   : "%0" ((USItype)(u)),					\
	     "r" ((USItype)(v)));					\
  (w1) = __xx.__i.__h; (w0) = __xx.__i.__l;})
#define smul_ppmm(w1, w0, u, v) \
  ({union {DItype __ll;							\
	   struct {SItype __l, __h;} __i;				\
	  } __xx;							\
  __asm__ ("mulwx %2,%0"						\
	   : "=r" (__xx.__ll)						\
	   : "%0" ((SItype)(u)),					\
	     "r" ((SItype)(v)));					\
  (w1) = __xx.__i.__h; (w0) = __xx.__i.__l;})
#define __umulsidi3(u, v) \
  ({UDItype __w;							\
    __asm__ ("mulwux %2,%0"						\
	     : "=r" (__w)						\
	     : "%0" ((USItype)(u)),					\
	       "r" ((USItype)(v)));					\
    __w; })
#endif /* __clipper__ */

#if defined (__gmicro__)
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
  __asm__ ("add.w %5,%1
	addx %3,%0"							\
	   : "=g" ((USItype)(sh)),					\
	     "=&g" ((USItype)(sl))					\
	   : "%0" ((USItype)(ah)),					\
	     "g" ((USItype)(bh)),					\
	     "%1" ((USItype)(al)),					\
	     "g" ((USItype)(bl)))
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
  __asm__ ("sub.w %5,%1
	subx %3,%0"							\
	   : "=g" ((USItype)(sh)),					\
	     "=&g" ((USItype)(sl))					\
	   : "0" ((USItype)(ah)),					\
	     "g" ((USItype)(bh)),					\
	     "1" ((USItype)(al)),					\
	     "g" ((USItype)(bl)))
#define umul_ppmm(ph, pl, m0, m1) \
  __asm__ ("mulx %3,%0,%1"						\
	   : "=g" ((USItype)(ph)),					\
	     "=r" ((USItype)(pl))					\
	   : "%0" ((USItype)(m0)),					\
	     "g" ((USItype)(m1)))
#define udiv_qrnnd(q, r, nh, nl, d) \
  __asm__ ("divx %4,%0,%1"						\
	   : "=g" ((USItype)(q)),					\
	     "=r" ((USItype)(r))					\
	   : "1" ((USItype)(nh)),					\
	     "0" ((USItype)(nl)),					\
	     "g" ((USItype)(d)))
#define count_leading_zeros(count, x) \
  __asm__ ("bsch/1 %1,%0"						\
	   : "=g" (count)						\
	   : "g" ((USItype)(x)),					\
	     "0" ((USItype)0))
#endif

#if defined (__hppa)
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
  __asm__ ("add %4,%5,%1
	addc %2,%3,%0"							\
	   : "=r" ((USItype)(sh)),					\
	     "=&r" ((USItype)(sl))					\
	   : "%rM" ((USItype)(ah)),					\
	     "rM" ((USItype)(bh)),					\
	     "%rM" ((USItype)(al)),					\
	     "rM" ((USItype)(bl)))
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
  __asm__ ("sub %4,%5,%1
	subb %2,%3,%0"							\
	   : "=r" ((USItype)(sh)),					\
	     "=&r" ((USItype)(sl))					\
	   : "rM" ((USItype)(ah)),					\
	     "rM" ((USItype)(bh)),					\
	     "rM" ((USItype)(al)),					\
	     "rM" ((USItype)(bl)))
#if defined (_PA_RISC1_1)
#define umul_ppmm(w1, w0, u, v) \
  do {									\
    union								\
      {									\
	UDItype __f;							\
	struct {USItype __w1, __w0;} __w1w0;				\
      } __t;								\
    __asm__ ("xmpyu %1,%2,%0"						\
	     : "=x" (__t.__f)						\
	     : "x" ((USItype)(u)),					\
	       "x" ((USItype)(v)));					\
    (w1) = __t.__w1w0.__w1;						\
    (w0) = __t.__w1w0.__w0;						\
     } while (0)
#define UMUL_TIME 8
#else
#define UMUL_TIME 30
#endif
#define UDIV_TIME 40
#define count_leading_zeros(count, x) \
  do {									\
    USItype __tmp;							\
    __asm__ (								\
       "ldi		1,%0
	extru,=		%1,15,16,%%r0		; Bits 31..16 zero?
	extru,tr	%1,15,16,%1		; No.  Shift down, skip add.
	ldo		16(%0),%0		; Yes.  Perform add.
	extru,=		%1,23,8,%%r0		; Bits 15..8 zero?
	extru,tr	%1,23,8,%1		; No.  Shift down, skip add.
	ldo		8(%0),%0		; Yes.  Perform add.
	extru,=		%1,27,4,%%r0		; Bits 7..4 zero?
	extru,tr	%1,27,4,%1		; No.  Shift down, skip add.
	ldo		4(%0),%0		; Yes.  Perform add.
	extru,=		%1,29,2,%%r0		; Bits 3..2 zero?
	extru,tr	%1,29,2,%1		; No.  Shift down, skip add.
	ldo		2(%0),%0		; Yes.  Perform add.
	extru		%1,30,1,%1		; Extract bit 1.
	sub		%0,%1,%0		; Subtract it.
	" : "=r" (count), "=r" (__tmp) : "1" (x));			\
  } while (0)
#endif

#if defined (__i386__) || defined (__i486__)
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
  __asm__ ("addl %5,%1
	adcl %3,%0"							\
	   : "=r" ((USItype)(sh)),					\
	     "=&r" ((USItype)(sl))					\
	   : "%0" ((USItype)(ah)),					\
	     "g" ((USItype)(bh)),					\
	     "%1" ((USItype)(al)),					\
	     "g" ((USItype)(bl)))
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
  __asm__ ("subl %5,%1
	sbbl %3,%0"							\
	   : "=r" ((USItype)(sh)),					\
	     "=&r" ((USItype)(sl))					\
	   : "0" ((USItype)(ah)),					\
	     "g" ((USItype)(bh)),					\
	     "1" ((USItype)(al)),					\
	     "g" ((USItype)(bl)))
#define umul_ppmm(w1, w0, u, v) \
  __asm__ ("mull %3"							\
	   : "=a" ((USItype)(w0)),					\
	     "=d" ((USItype)(w1))					\
	   : "%0" ((USItype)(u)),					\
	     "rm" ((USItype)(v)))
#define udiv_qrnnd(q, r, n1, n0, d) \
  __asm__ ("divl %4"							\
	   : "=a" ((USItype)(q)),					\
	     "=d" ((USItype)(r))					\
	   : "0" ((USItype)(n0)),					\
	     "1" ((USItype)(n1)),					\
	     "rm" ((USItype)(d)))
#define count_leading_zeros(count, x) \
  do {									\
    USItype __cbtmp;							\
    __asm__ ("bsrl %1,%0"						\
	     : "=r" (__cbtmp) : "rm" ((USItype)(x)));			\
    (count) = __cbtmp ^ 31;						\
  } while (0)
#define UMUL_TIME 40
#define UDIV_TIME 40
#endif /* 80x86 */

#if defined (__i860__)
#if 0
/* Make sure these patterns really improve the code before
   switching them on.  */
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
  do {									\
    union								\
      {									\
	DItype __ll;							\
	struct {USItype __l, __h;} __i;					\
      }  __a, __b, __s;							\
    __a.__i.__l = (al);							\
    __a.__i.__h = (ah);							\
    __b.__i.__l = (bl);							\
    __b.__i.__h = (bh);							\
    __asm__ ("fiadd.dd %1,%2,%0"					\
	     : "=f" (__s.__ll)						\
	     : "%f" (__a.__ll), "f" (__b.__ll));			\
    (sh) = __s.__i.__h;							\
    (sl) = __s.__i.__l;							\
    } while (0)
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
  do {									\
    union								\
      {									\
	DItype __ll;							\
	struct {USItype __l, __h;} __i;					\
      }  __a, __b, __s;							\
    __a.__i.__l = (al);							\
    __a.__i.__h = (ah);							\
    __b.__i.__l = (bl);							\
    __b.__i.__h = (bh);							\
    __asm__ ("fisub.dd %1,%2,%0"					\
	     : "=f" (__s.__ll)						\
	     : "%f" (__a.__ll), "f" (__b.__ll));			\
    (sh) = __s.__i.__h;							\
    (sl) = __s.__i.__l;							\
    } while (0)
#endif
#endif /* __i860__ */

#if defined (__i960__)
#define umul_ppmm(w1, w0, u, v) \
  ({union {UDItype __ll;						\
	   struct {USItype __l, __h;} __i;				\
	  } __xx;							\