/*
?*?Copyright?（c）?2009?CodeSourcery?Inc.
?*?All?rights?reserved.
?*?
?*?Redistribution?and?use?in?source?and?binary?forms?with?or?without
?*?modification?are?permitted?provided?that?the?following?conditions?are?met:
?*?????*?Redistributions?of?source?code?must?retain?the?above?copyright
?*???????notice?this?list?of?conditions?and?the?following?disclaimer.
?*?????*?Redistributions?in?binary?form?must?reproduce?the?above?copyright
?*???????notice?this?list?of?conditions?and?the?following?disclaimer?in?the
?*???????documentation?and/or?other?materials?provided?with?the?distribution.
?*?????*?Neither?the?name?of?CodeSourcery?nor?the
?*???????names?of?its?contributors?may?be?used?to?endorse?or?promote?products
?*???????derived?from?this?software?without?specific?prior?written?permission.
?*?
?*?THIS?SOFTWARE?IS?PROVIDED?BY?CODESOURCERY?INC.?‘‘AS?IS‘‘?AND?ANY
?*?EXPRESS?OR?IMPLIED?WARRANTIES?INCLUDING?BUT?NOT?LIMITED?TO?THE?IMPLIED
?*?WARRANTIES?OF?MERCHANTABILITY?AND?FITNESS?FOR?A?PARTICULAR?PURPOSE?ARE
?*?DISCLAIMED.?IN?NO?EVENT?SHALL?CODESOURCERY?BE?LIABLE?FOR?ANY
?*?DIRECT?INDIRECT?INCIDENTAL?SPECIAL?EXEMPLARY?OR?CONSEQUENTIAL?DAMAGES
?*?（INCLUDING?BUT?NOT?LIMITED?TO?PROCUREMENT?OF?SUBSTITUTE?GOODS?OR?SERVICES;
?*?LOSS?OF?USE?DATA?OR?PROFITS;?OR?BUSINESS?INTERRUPTION）?HOWEVER?CAUSED?AND
?*?ON?ANY?THEORY?OF?LIABILITY?WHETHER?IN?CONTRACT?STRICT?LIABILITY?OR?TORT
?*?（INCLUDING?NEGLIGENCE?OR?OTHERWISE）?ARISING?IN?ANY?WAY?OUT?OF?THE?USE?OF?THIS
?*?SOFTWARE?EVEN?IF?ADVISED?OF?THE?POSSIBILITY?OF?SUCH?DAMAGE.
?*/
ieee754dp
ieee754dp_format（int?sn?int?xe?uint64_t?xm）
{
??xe?+=?DP_EBIAS;

??if?（UNLIKELY?（xe?????{
??????/*?Strip?lower?bits.??*/
??????int?es;
	
??????if?（IEEE754_NO_DENORMS?（））
	{
	??SETCX（IEEE754_UNDERFLOW）;
	??return?ieee754dp_zero（sn）;
	}

???????/*?Sticky?right?shift?es?bits.??*/
???????es?=?DP_EBIAS?+?DP_EMIN?-?xe;
???????xm?=?XDPSRS（xmes）;
???????xe?+=?es;

????}

??if?（（uint32_t）xm?&?（（1?<????{
??????SETCX（IEEE754_INEXACT）;
??????/*?Inexact?must?round?off?guard?bits.??*/
??????switch?（IEEE754_GET_RM?（））
	{
	case?IEEE754_RZ:
	??break;
	case?IEEE754_RN:
	??xm?+=?（（0x1?<	??????????+?（（（uint32_t）xm?>>?DP_GUARDBITS）?&?1）;
	??break;
	case?IEEE754_RU:	/*?toward?+Infinity?*/
	??if?（!sn）
	????xm?+=?（0x1?<	??break;
	case?IEEE754_RD:	/*?toward?-Infinity?*/
	??if?（sn）?
	????xm?+=?（0x1?<	????break;
	}

??????/*?Adjust?exponent?for?rounding?overflow.??*/
??????if?（xm?&?DP_MBIT（DP_MBITS?+?DP_GUARDBITS?+?1））
	{
	??xm?>>=?1;
	??xe++;
	}
????}

??/*?Strip?grs?bits.??*/
??xm?>>=?DP_GUARDBITS;
????
??if?（UNLIKELY?（xe?>?DP_EBIAS?+?DP_EMAX））
????{
???????SETCX（IEEE754_OVERFLOW）;
???????/*?-O?can?be?table?indexed?by?（rmsn）.??*/
???????switch?（IEEE754_GET_RM?（））
	{
	case?IEEE754_RN:
	??return?ieee754dp_inf?（sn）;
	case?IEEE754_RZ:
	??return?ieee754dp_max（sn）;
	case?IEEE754_RU:	/*?toward?+Infinity?*/
	??if?（sn?==?0）
	????return?ie