arch/sparc/math-emu/sfp-util_64.h

Source file repositories/reference/linux-study-clean/arch/sparc/math-emu/sfp-util_64.h

File Facts

System
Linux kernel
Corpus path
arch/sparc/math-emu/sfp-util_64.h
Extension
.h
Size
4141 bytes
Lines
122
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <asm/byteorder.h>

#define add_ssaaaa(sh, sl, ah, al, bh, bl) 	\
  __asm__ ("addcc %4,%5,%1\n\t"			\
	   "add %2,%3,%0\n\t"			\
  	   "bcs,a,pn %%xcc, 1f\n\t"		\
  	   "add %0, 1, %0\n"			\
  	   "1:"					\
	   : "=r" (sh),				\
	     "=&r" (sl)				\
	   : "r" ((UDItype)(ah)),		\
	     "r" ((UDItype)(bh)),		\
	     "r" ((UDItype)(al)),		\
	     "r" ((UDItype)(bl))		\
	   : "cc")
	   
#define sub_ddmmss(sh, sl, ah, al, bh, bl) 	\
  __asm__ ("subcc %4,%5,%1\n\t"			\
  	   "sub %2,%3,%0\n\t"			\
  	   "bcs,a,pn %%xcc, 1f\n\t"		\
  	   "sub %0, 1, %0\n"			\
  	   "1:"					\
	   : "=r" (sh),				\
	     "=&r" (sl)				\
	   : "r" ((UDItype)(ah)),		\
	     "r" ((UDItype)(bh)),		\
	     "r" ((UDItype)(al)),		\
	     "r" ((UDItype)(bl))		\
	   : "cc")

#define umul_ppmm(wh, wl, u, v)				\
  do {							\
	  UDItype tmp1, tmp2, tmp3, tmp4;		\
	  __asm__ __volatile__ (			\
		   "srl %7,0,%3\n\t"			\
		   "mulx %3,%6,%1\n\t"			\
		   "srlx %6,32,%2\n\t"			\
		   "mulx %2,%3,%4\n\t"			\
		   "sllx %4,32,%5\n\t"			\
		   "srl %6,0,%3\n\t"			\
		   "sub %1,%5,%5\n\t"			\
		   "srlx %5,32,%5\n\t"			\
		   "addcc %4,%5,%4\n\t"			\
		   "srlx %7,32,%5\n\t"			\
		   "mulx %3,%5,%3\n\t"			\
		   "mulx %2,%5,%5\n\t"			\
		   "sethi %%hi(0x80000000),%2\n\t"	\
		   "addcc %4,%3,%4\n\t"			\
		   "srlx %4,32,%4\n\t"			\
		   "add %2,%2,%2\n\t"			\
		   "movcc %%xcc,%%g0,%2\n\t"		\
		   "addcc %5,%4,%5\n\t"			\
		   "sllx %3,32,%3\n\t"			\
		   "add %1,%3,%1\n\t"			\
		   "add %5,%2,%0"			\
	   : "=r" (wh),					\
	     "=&r" (wl),				\
	     "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4) \
	   : "r" ((UDItype)(u)),			\
	     "r" ((UDItype)(v))				\
	   : "cc");					\
  } while (0)
  
#define udiv_qrnnd(q, r, n1, n0, d) 			\
  do {                                                  \
    UWtype __d1, __d0, __q1, __q0, __r1, __r0, __m;     \
    __d1 = (d >> 32);                                   \
    __d0 = (USItype)d;                                  \
                                                        \
    __r1 = (n1) % __d1;                                 \
    __q1 = (n1) / __d1;                                 \
    __m = (UWtype) __q1 * __d0;                         \
    __r1 = (__r1 << 32) | (n0 >> 32);                   \
    if (__r1 < __m)                                     \
      {                                                 \
        __q1--, __r1 += (d);                            \
        if (__r1 >= (d)) /* i.e. we didn't get carry when adding to __r1 */ \
          if (__r1 < __m)                               \
            __q1--, __r1 += (d);                        \
      }                                                 \
    __r1 -= __m;                                        \
                                                        \
    __r0 = __r1 % __d1;                                 \
    __q0 = __r1 / __d1;                                 \
    __m = (UWtype) __q0 * __d0;                         \
    __r0 = (__r0 << 32) | ((USItype)n0);                \
    if (__r0 < __m)                                     \

Annotation

Implementation Notes