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linux/arch/parisc/math-emu/sgl_float.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

487 lines
19 KiB
C
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/*
* Linux/PA-RISC Project (http://www.parisc-linux.org/)
*
* Floating-point emulation code
* Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
*
* This program 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 program 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
*/
#ifdef __NO_PA_HDRS
PA header file -- do not include this header file for non-PA builds.
#endif
/* 32-bit word grabing functions */
#define Sgl_firstword(value) Sall(value)
#define Sgl_secondword(value) dummy_location
#define Sgl_thirdword(value) dummy_location
#define Sgl_fourthword(value) dummy_location
#define Sgl_sign(object) Ssign(object)
#define Sgl_exponent(object) Sexponent(object)
#define Sgl_signexponent(object) Ssignexponent(object)
#define Sgl_mantissa(object) Smantissa(object)
#define Sgl_exponentmantissa(object) Sexponentmantissa(object)
#define Sgl_all(object) Sall(object)
/* sgl_and_signs ands the sign bits of each argument and puts the result
* into the first argument. sgl_or_signs ors those same sign bits */
#define Sgl_and_signs( src1dst, src2) \
Sall(src1dst) = (Sall(src2)|~((unsigned int)1<<31)) & Sall(src1dst)
#define Sgl_or_signs( src1dst, src2) \
Sall(src1dst) = (Sall(src2)&((unsigned int)1<<31)) | Sall(src1dst)
/* The hidden bit is always the low bit of the exponent */
#define Sgl_clear_exponent_set_hidden(srcdst) Deposit_sexponent(srcdst,1)
#define Sgl_clear_signexponent_set_hidden(srcdst) \
Deposit_ssignexponent(srcdst,1)
#define Sgl_clear_sign(srcdst) Sall(srcdst) &= ~((unsigned int)1<<31)
#define Sgl_clear_signexponent(srcdst) Sall(srcdst) &= 0x007fffff
/* varamount must be less than 32 for the next three functions */
#define Sgl_rightshift(srcdst, varamount) \
Sall(srcdst) >>= varamount
#define Sgl_leftshift(srcdst, varamount) \
Sall(srcdst) <<= varamount
#define Sgl_rightshift_exponentmantissa(srcdst, varamount) \
Sall(srcdst) = \
(Sexponentmantissa(srcdst) >> varamount) | \
(Sall(srcdst) & ((unsigned int)1<<31))
#define Sgl_leftshiftby1_withextent(left,right,result) \
Shiftdouble(Sall(left),Extall(right),31,Sall(result))
#define Sgl_rightshiftby1_withextent(left,right,dst) \
Shiftdouble(Sall(left),Extall(right),1,Extall(right))
#define Sgl_arithrightshiftby1(srcdst) \
Sall(srcdst) = (int)Sall(srcdst) >> 1
/* Sign extend the sign bit with an integer destination */
#define Sgl_signextendedsign(value) Ssignedsign(value)
#define Sgl_isone_hidden(sgl_value) (Shidden(sgl_value))
#define Sgl_increment(sgl_value) Sall(sgl_value) += 1
#define Sgl_increment_mantissa(sgl_value) \
Deposit_smantissa(sgl_value,sgl_value+1)
#define Sgl_decrement(sgl_value) Sall(sgl_value) -= 1
#define Sgl_isone_sign(sgl_value) (Is_ssign(sgl_value)!=0)
#define Sgl_isone_hiddenoverflow(sgl_value) \
(Is_shiddenoverflow(sgl_value)!=0)
#define Sgl_isone_lowmantissa(sgl_value) (Is_slow(sgl_value)!=0)
#define Sgl_isone_signaling(sgl_value) (Is_ssignaling(sgl_value)!=0)
#define Sgl_is_signalingnan(sgl_value) (Ssignalingnan(sgl_value)==0x1ff)
#define Sgl_isnotzero(sgl_value) (Sall(sgl_value)!=0)
#define Sgl_isnotzero_hiddenhigh7mantissa(sgl_value) \
(Shiddenhigh7mantissa(sgl_value)!=0)
#define Sgl_isnotzero_low4(sgl_value) (Slow4(sgl_value)!=0)
#define Sgl_isnotzero_exponent(sgl_value) (Sexponent(sgl_value)!=0)
#define Sgl_isnotzero_mantissa(sgl_value) (Smantissa(sgl_value)!=0)
#define Sgl_isnotzero_exponentmantissa(sgl_value) \
(Sexponentmantissa(sgl_value)!=0)
#define Sgl_iszero(sgl_value) (Sall(sgl_value)==0)
#define Sgl_iszero_signaling(sgl_value) (Is_ssignaling(sgl_value)==0)
#define Sgl_iszero_hidden(sgl_value) (Is_shidden(sgl_value)==0)
#define Sgl_iszero_hiddenoverflow(sgl_value) \
(Is_shiddenoverflow(sgl_value)==0)
#define Sgl_iszero_hiddenhigh3mantissa(sgl_value) \
(Shiddenhigh3mantissa(sgl_value)==0)
#define Sgl_iszero_hiddenhigh7mantissa(sgl_value) \
(Shiddenhigh7mantissa(sgl_value)==0)
#define Sgl_iszero_sign(sgl_value) (Is_ssign(sgl_value)==0)
#define Sgl_iszero_exponent(sgl_value) (Sexponent(sgl_value)==0)
#define Sgl_iszero_mantissa(sgl_value) (Smantissa(sgl_value)==0)
#define Sgl_iszero_exponentmantissa(sgl_value) \
(Sexponentmantissa(sgl_value)==0)
#define Sgl_isinfinity_exponent(sgl_value) \
(Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT)
#define Sgl_isnotinfinity_exponent(sgl_value) \
(Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT)
#define Sgl_isinfinity(sgl_value) \
(Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT && \
Sgl_mantissa(sgl_value)==0)
#define Sgl_isnan(sgl_value) \
(Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT && \
Sgl_mantissa(sgl_value)!=0)
#define Sgl_isnotnan(sgl_value) \
(Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT || \
Sgl_mantissa(sgl_value)==0)
#define Sgl_islessthan(sgl_op1,sgl_op2) \
(Sall(sgl_op1) < Sall(sgl_op2))
#define Sgl_isgreaterthan(sgl_op1,sgl_op2) \
(Sall(sgl_op1) > Sall(sgl_op2))
#define Sgl_isnotlessthan(sgl_op1,sgl_op2) \
(Sall(sgl_op1) >= Sall(sgl_op2))
#define Sgl_isequal(sgl_op1,sgl_op2) \
(Sall(sgl_op1) == Sall(sgl_op2))
#define Sgl_leftshiftby8(sgl_value) \
Sall(sgl_value) <<= 8
#define Sgl_leftshiftby4(sgl_value) \
Sall(sgl_value) <<= 4
#define Sgl_leftshiftby3(sgl_value) \
Sall(sgl_value) <<= 3
#define Sgl_leftshiftby2(sgl_value) \
Sall(sgl_value) <<= 2
#define Sgl_leftshiftby1(sgl_value) \
Sall(sgl_value) <<= 1
#define Sgl_rightshiftby1(sgl_value) \
Sall(sgl_value) >>= 1
#define Sgl_rightshiftby4(sgl_value) \
Sall(sgl_value) >>= 4
#define Sgl_rightshiftby8(sgl_value) \
Sall(sgl_value) >>= 8
#define Sgl_ismagnitudeless(signlessleft,signlessright) \
/* unsigned int signlessleft, signlessright; */ \
(signlessleft < signlessright)
#define Sgl_copytoint_exponentmantissa(source,dest) \
dest = Sexponentmantissa(source)
/* A quiet NaN has the high mantissa bit clear and at least on other (in this
* case the adjacent bit) bit set. */
#define Sgl_set_quiet(sgl_value) Deposit_shigh2mantissa(sgl_value,1)
#define Sgl_set_exponent(sgl_value,exp) Deposit_sexponent(sgl_value,exp)
#define Sgl_set_mantissa(dest,value) Deposit_smantissa(dest,value)
#define Sgl_set_exponentmantissa(dest,value) \
Deposit_sexponentmantissa(dest,value)
/* An infinity is represented with the max exponent and a zero mantissa */
#define Sgl_setinfinity_exponent(sgl_value) \
Deposit_sexponent(sgl_value,SGL_INFINITY_EXPONENT)
#define Sgl_setinfinity_exponentmantissa(sgl_value) \
Deposit_sexponentmantissa(sgl_value, \
(SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))))
#define Sgl_setinfinitypositive(sgl_value) \
Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH)))
#define Sgl_setinfinitynegative(sgl_value) \
Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) \
| ((unsigned int)1<<31)
#define Sgl_setinfinity(sgl_value,sign) \
Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) | \
((unsigned int)sign << 31)
#define Sgl_sethigh4bits(sgl_value, extsign) \
Deposit_shigh4(sgl_value,extsign)
#define Sgl_set_sign(sgl_value,sign) Deposit_ssign(sgl_value,sign)
#define Sgl_invert_sign(sgl_value) \
Deposit_ssign(sgl_value,~Ssign(sgl_value))
#define Sgl_setone_sign(sgl_value) Deposit_ssign(sgl_value,1)
#define Sgl_setone_lowmantissa(sgl_value) Deposit_slow(sgl_value,1)
#define Sgl_setzero_sign(sgl_value) Sall(sgl_value) &= 0x7fffffff
#define Sgl_setzero_exponent(sgl_value) Sall(sgl_value) &= 0x807fffff
#define Sgl_setzero_mantissa(sgl_value) Sall(sgl_value) &= 0xff800000
#define Sgl_setzero_exponentmantissa(sgl_value) Sall(sgl_value) &= 0x80000000
#define Sgl_setzero(sgl_value) Sall(sgl_value) = 0
#define Sgl_setnegativezero(sgl_value) Sall(sgl_value) = (unsigned int)1 << 31
/* Use following macro for both overflow & underflow conditions */
#define ovfl -
#define unfl +
#define Sgl_setwrapped_exponent(sgl_value,exponent,op) \
Deposit_sexponent(sgl_value,(exponent op SGL_WRAP))
#define Sgl_setlargestpositive(sgl_value) \
Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
| ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 )
#define Sgl_setlargestnegative(sgl_value) \
Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
| ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 ) \
| ((unsigned int)1<<31)
#define Sgl_setnegativeinfinity(sgl_value) \
Sall(sgl_value) = \
((1<<SGL_EXP_LENGTH) | SGL_INFINITY_EXPONENT) << (32-(1+SGL_EXP_LENGTH))
#define Sgl_setlargest(sgl_value,sign) \
Sall(sgl_value) = (unsigned int)sign << 31 | \
(((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
| ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
#define Sgl_setlargest_exponentmantissa(sgl_value) \
Sall(sgl_value) = Sall(sgl_value) & ((unsigned int)1<<31) | \
(((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
| ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
/* The high bit is always zero so arithmetic or logical shifts will work. */
#define Sgl_right_align(srcdst,shift,extent) \
/* sgl_floating_point srcdst; int shift; extension extent */ \
if (shift < 32) { \
Extall(extent) = Sall(srcdst) << (32-(shift)); \
Sall(srcdst) >>= shift; \
} \
else { \
Extall(extent) = Sall(srcdst); \
Sall(srcdst) = 0; \
}
#define Sgl_hiddenhigh3mantissa(sgl_value) Shiddenhigh3mantissa(sgl_value)
#define Sgl_hidden(sgl_value) Shidden(sgl_value)
#define Sgl_lowmantissa(sgl_value) Slow(sgl_value)
/* The left argument is never smaller than the right argument */
#define Sgl_subtract(sgl_left,sgl_right,sgl_result) \
Sall(sgl_result) = Sall(sgl_left) - Sall(sgl_right)
/* Subtract right augmented with extension from left augmented with zeros and
* store into result and extension. */
#define Sgl_subtract_withextension(left,right,extent,result) \
/* sgl_floating_point left,right,result; extension extent */ \
Sgl_subtract(left,right,result); \
if((Extall(extent) = 0-Extall(extent))) \
Sall(result) = Sall(result)-1
#define Sgl_addition(sgl_left,sgl_right,sgl_result) \
Sall(sgl_result) = Sall(sgl_left) + Sall(sgl_right)
#define Sgl_xortointp1(left,right,result) \
result = Sall(left) XOR Sall(right);
#define Sgl_xorfromintp1(left,right,result) \
Sall(result) = left XOR Sall(right)
/* Need to Initialize */
#define Sgl_makequietnan(dest) \
Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH)) \
| (1<<(32-(1+SGL_EXP_LENGTH+2)))
#define Sgl_makesignalingnan(dest) \
Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH)) \
| (1<<(32-(1+SGL_EXP_LENGTH+1)))
#define Sgl_normalize(sgl_opnd,exponent) \
while(Sgl_iszero_hiddenhigh7mantissa(sgl_opnd)) { \
Sgl_leftshiftby8(sgl_opnd); \
exponent -= 8; \
} \
if(Sgl_iszero_hiddenhigh3mantissa(sgl_opnd)) { \
Sgl_leftshiftby4(sgl_opnd); \
exponent -= 4; \
} \
while(Sgl_iszero_hidden(sgl_opnd)) { \
Sgl_leftshiftby1(sgl_opnd); \
exponent -= 1; \
}
#define Sgl_setoverflow(sgl_opnd) \
/* set result to infinity or largest number */ \
switch (Rounding_mode()) { \
case ROUNDPLUS: \
if (Sgl_isone_sign(sgl_opnd)) { \
Sgl_setlargestnegative(sgl_opnd); \
} \
else { \
Sgl_setinfinitypositive(sgl_opnd); \
} \
break; \
case ROUNDMINUS: \
if (Sgl_iszero_sign(sgl_opnd)) { \
Sgl_setlargestpositive(sgl_opnd); \
} \
else { \
Sgl_setinfinitynegative(sgl_opnd); \
} \
break; \
case ROUNDNEAREST: \
Sgl_setinfinity_exponentmantissa(sgl_opnd); \
break; \
case ROUNDZERO: \
Sgl_setlargest_exponentmantissa(sgl_opnd); \
}
#define Sgl_denormalize(opnd,exponent,guard,sticky,inexact) \
Sgl_clear_signexponent_set_hidden(opnd); \
if (exponent >= (1 - SGL_P)) { \
guard = (Sall(opnd) >> -exponent) & 1; \
if (exponent < 0) sticky |= Sall(opnd) << (32+exponent); \
inexact = guard | sticky; \
Sall(opnd) >>= (1-exponent); \
} \
else { \
guard = 0; \
sticky |= Sall(opnd); \
inexact = sticky; \
Sgl_setzero(opnd); \
}
/*
* The fused multiply add instructions requires a single extended format,
* with 48 bits of mantissa.
*/
#define SGLEXT_THRESHOLD 48
#define Sglext_setzero(valA,valB) \
Sextallp1(valA) = 0; Sextallp2(valB) = 0
#define Sglext_isnotzero_mantissap2(valB) (Sextallp2(valB)!=0)
#define Sglext_isone_lowp1(val) (Sextlowp1(val)!=0)
#define Sglext_isone_highp2(val) (Sexthighp2(val)!=0)
#define Sglext_isnotzero_low31p2(val) (Sextlow31p2(val)!=0)
#define Sglext_iszero(valA,valB) (Sextallp1(valA)==0 && Sextallp2(valB)==0)
#define Sgl_copytoptr(src,destptr) *destptr = src
#define Sgl_copyfromptr(srcptr,dest) dest = *srcptr
#define Sglext_copy(srca,srcb,desta,destb) \
Sextallp1(desta) = Sextallp1(srca); \
Sextallp2(destb) = Sextallp2(srcb)
#define Sgl_copyto_sglext(src1,dest1,dest2) \
Sextallp1(dest1) = Sall(src1); Sextallp2(dest2) = 0
#define Sglext_swap_lower(leftp2,rightp2) \
Sextallp2(leftp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2); \
Sextallp2(rightp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2); \
Sextallp2(leftp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2)
#define Sglext_setone_lowmantissap2(value) Deposit_dlowp2(value,1)
/* The high bit is always zero so arithmetic or logical shifts will work. */
#define Sglext_right_align(srcdstA,srcdstB,shift) \
{int shiftamt, sticky; \
shiftamt = shift % 32; \
sticky = 0; \
switch (shift/32) { \
case 0: if (shiftamt > 0) { \
sticky = Sextallp2(srcdstB) << 32 - (shiftamt); \
Variable_shift_double(Sextallp1(srcdstA), \
Sextallp2(srcdstB),shiftamt,Sextallp2(srcdstB)); \
Sextallp1(srcdstA) >>= shiftamt; \
} \
break; \
case 1: if (shiftamt > 0) { \
sticky = (Sextallp1(srcdstA) << 32 - (shiftamt)) | \
Sextallp2(srcdstB); \
} \
else { \
sticky = Sextallp2(srcdstB); \
} \
Sextallp2(srcdstB) = Sextallp1(srcdstA) >> shiftamt; \
Sextallp1(srcdstA) = 0; \
break; \
} \
if (sticky) Sglext_setone_lowmantissap2(srcdstB); \
}
/* The left argument is never smaller than the right argument */
#define Sglext_subtract(lefta,leftb,righta,rightb,resulta,resultb) \
if( Sextallp2(rightb) > Sextallp2(leftb) ) Sextallp1(lefta)--; \
Sextallp2(resultb) = Sextallp2(leftb) - Sextallp2(rightb); \
Sextallp1(resulta) = Sextallp1(lefta) - Sextallp1(righta)
#define Sglext_addition(lefta,leftb,righta,rightb,resulta,resultb) \
/* If the sum of the low words is less than either source, then \
* an overflow into the next word occurred. */ \
if ((Sextallp2(resultb) = Sextallp2(leftb)+Sextallp2(rightb)) < \
Sextallp2(rightb)) \
Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)+1; \
else Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)
#define Sglext_arithrightshiftby1(srcdstA,srcdstB) \
Shiftdouble(Sextallp1(srcdstA),Sextallp2(srcdstB),1,Sextallp2(srcdstB)); \
Sextallp1(srcdstA) = (int)Sextallp1(srcdstA) >> 1
#define Sglext_leftshiftby8(valA,valB) \
Shiftdouble(Sextallp1(valA),Sextallp2(valB),24,Sextallp1(valA)); \
Sextallp2(valB) <<= 8
#define Sglext_leftshiftby4(valA,valB) \
Shiftdouble(Sextallp1(valA),Sextallp2(valB),28,Sextallp1(valA)); \
Sextallp2(valB) <<= 4
#define Sglext_leftshiftby3(valA,valB) \
Shiftdouble(Sextallp1(valA),Sextallp2(valB),29,Sextallp1(valA)); \
Sextallp2(valB) <<= 3
#define Sglext_leftshiftby2(valA,valB) \
Shiftdouble(Sextallp1(valA),Sextallp2(valB),30,Sextallp1(valA)); \
Sextallp2(valB) <<= 2
#define Sglext_leftshiftby1(valA,valB) \
Shiftdouble(Sextallp1(valA),Sextallp2(valB),31,Sextallp1(valA)); \
Sextallp2(valB) <<= 1
#define Sglext_rightshiftby4(valueA,valueB) \
Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),4,Sextallp2(valueB)); \
Sextallp1(valueA) >>= 4
#define Sglext_rightshiftby3(valueA,valueB) \
Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),3,Sextallp2(valueB)); \
Sextallp1(valueA) >>= 3
#define Sglext_rightshiftby1(valueA,valueB) \
Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),1,Sextallp2(valueB)); \
Sextallp1(valueA) >>= 1
#define Sglext_xortointp1(left,right,result) Sgl_xortointp1(left,right,result)
#define Sglext_xorfromintp1(left,right,result) \
Sgl_xorfromintp1(left,right,result)
#define Sglext_copytoint_exponentmantissa(src,dest) \
Sgl_copytoint_exponentmantissa(src,dest)
#define Sglext_ismagnitudeless(signlessleft,signlessright) \
Sgl_ismagnitudeless(signlessleft,signlessright)
#define Sglext_set_sign(dbl_value,sign) Sgl_set_sign(dbl_value,sign)
#define Sglext_clear_signexponent_set_hidden(srcdst) \
Sgl_clear_signexponent_set_hidden(srcdst)
#define Sglext_clear_signexponent(srcdst) Sgl_clear_signexponent(srcdst)
#define Sglext_clear_sign(srcdst) Sgl_clear_sign(srcdst)
#define Sglext_isone_hidden(dbl_value) Sgl_isone_hidden(dbl_value)
#define Sglext_denormalize(opndp1,opndp2,exponent,is_tiny) \
{int sticky; \
is_tiny = TRUE; \
if (exponent == 0 && Sextallp2(opndp2)) { \
switch (Rounding_mode()) { \
case ROUNDPLUS: \
if (Sgl_iszero_sign(opndp1)) \
if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
is_tiny = FALSE; \
break; \
case ROUNDMINUS: \
if (Sgl_isone_sign(opndp1)) { \
if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
is_tiny = FALSE; \
} \
break; \
case ROUNDNEAREST: \
if (Sglext_isone_highp2(opndp2) && \
(Sglext_isone_lowp1(opndp1) || \
Sglext_isnotzero_low31p2(opndp2))) \
if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
is_tiny = FALSE; \
break; \
} \
} \
Sglext_clear_signexponent_set_hidden(opndp1); \
if (exponent >= (1-DBL_P)) { \
if (exponent >= -31) { \
if (exponent > -31) { \
sticky = Sextallp2(opndp2) << 31+exponent; \
Variable_shift_double(opndp1,opndp2,1-exponent,opndp2); \
Sextallp1(opndp1) >>= 1-exponent; \
} \
else { \
sticky = Sextallp2(opndp2); \
Sextallp2(opndp2) = Sextallp1(opndp1); \
Sextallp1(opndp1) = 0; \
} \
} \
else { \
sticky = (Sextallp1(opndp1) << 31+exponent) | \
Sextallp2(opndp2); \
Sextallp2(opndp2) = Sextallp1(opndp1) >> -31-exponent; \
Sextallp1(opndp1) = 0; \
} \
} \
else { \
sticky = Sextallp1(opndp1) | Sextallp2(opndp2); \
Sglext_setzero(opndp1,opndp2); \
} \
if (sticky) Sglext_setone_lowmantissap2(opndp2); \
exponent = 0; \
}
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