ppc_fneg.s

powerpc 405 优化过的硬浮点库

/* fpopt/ppc_fneg.S, pl_FPE_common, pl_linux 11/24/03 16:17:36                                                                  */
/*----------------------------------------------------------------------------- */
/*  Copyright (c) 2003, IBM Corporation                                         */
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/*----------------------------------------------------------------------------- */
/*                                                                              */
/* Function: negate a single or double floating point number                    */
/* Input:    r3, (r4 iff double)                                                */
/* Output:   r3, (r4 iff double)                                                */
/* Notes:   1. No stack frame is created for this function, so the following    */
/*             registers must be preserved, as required by ABI specification:   */
/*               LR, CR0, R1, R2, R13-R31                                       */
/*          2. operation performed according to IEEE754-1985 standard.          */
/*                                                                              */
/*----------------------------------------------------------------------------- */
   
#include <ppc4xx.inc>
   
function_prolog(__negdf2)
function_prolog(__negsf2)

     xoris     r3,r3,0x8000       /* flip sign of first or only arg */
     blr                          /* and return */

function_epilog(__negdf2)
function_epilog(__negsf2)