CoCalc -- sgl

GitHub Repository: torvalds/linux
Path: blob/master/arch/parisc/math-emu/sgl_float.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
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 *
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 * Floating-point emulation code
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 *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <[email protected]>
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 */
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#ifdef __NO_PA_HDRS
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    PA header file -- do not include this header file for non-PA builds.
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#endif
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/* 32-bit word grabbing functions */
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#define Sgl_firstword(value) Sall(value)
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#define Sgl_secondword(value) dummy_location
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#define Sgl_thirdword(value) dummy_location
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#define Sgl_fourthword(value) dummy_location
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#define Sgl_sign(object) Ssign(object)
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#define Sgl_exponent(object) Sexponent(object)
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#define Sgl_signexponent(object) Ssignexponent(object)
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#define Sgl_mantissa(object) Smantissa(object)
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#define Sgl_exponentmantissa(object) Sexponentmantissa(object)
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#define Sgl_all(object) Sall(object)
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/* sgl_and_signs ANDs the sign bits of each argument and puts the result
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 * into the first argument. sgl_or_signs ors those same sign bits */
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#define Sgl_and_signs( src1dst, src2)		\
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    Sall(src1dst) = (Sall(src2)|~((unsigned int)1<<31)) & Sall(src1dst)
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#define Sgl_or_signs( src1dst, src2)		\
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    Sall(src1dst) = (Sall(src2)&((unsigned int)1<<31)) | Sall(src1dst)
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/* The hidden bit is always the low bit of the exponent */
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#define Sgl_clear_exponent_set_hidden(srcdst) Deposit_sexponent(srcdst,1)
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#define Sgl_clear_signexponent_set_hidden(srcdst) \
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    Deposit_ssignexponent(srcdst,1)
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#define Sgl_clear_sign(srcdst) Sall(srcdst) &= ~((unsigned int)1<<31)
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#define Sgl_clear_signexponent(srcdst) Sall(srcdst) &= 0x007fffff
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/* varamount must be less than 32 for the next three functions */
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#define Sgl_rightshift(srcdst, varamount)	\
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    Sall(srcdst) >>= varamount
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#define Sgl_leftshift(srcdst, varamount)	\
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    Sall(srcdst) <<= varamount
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#define Sgl_rightshift_exponentmantissa(srcdst, varamount) \
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    Sall(srcdst) = \
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	(Sexponentmantissa(srcdst) >> varamount) | \
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	(Sall(srcdst) & ((unsigned int)1<<31))
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#define Sgl_leftshiftby1_withextent(left,right,result) \
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    Shiftdouble(Sall(left),Extall(right),31,Sall(result))
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#define Sgl_rightshiftby1_withextent(left,right,dst)		\
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    Shiftdouble(Sall(left),Extall(right),1,Extall(right))
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#define Sgl_arithrightshiftby1(srcdst)	\
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    Sall(srcdst) = (int)Sall(srcdst) >> 1
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/* Sign extend the sign bit with an integer destination */
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#define Sgl_signextendedsign(value) Ssignedsign(value)
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#define Sgl_isone_hidden(sgl_value) (Shidden(sgl_value))
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#define Sgl_increment(sgl_value) Sall(sgl_value) += 1
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#define Sgl_increment_mantissa(sgl_value) \
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    Deposit_smantissa(sgl_value,sgl_value+1)
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#define Sgl_decrement(sgl_value) Sall(sgl_value) -= 1
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#define Sgl_isone_sign(sgl_value) (Is_ssign(sgl_value)!=0)
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#define Sgl_isone_hiddenoverflow(sgl_value) \
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    (Is_shiddenoverflow(sgl_value)!=0)
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#define Sgl_isone_lowmantissa(sgl_value) (Is_slow(sgl_value)!=0)
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#define Sgl_isone_signaling(sgl_value) (Is_ssignaling(sgl_value)!=0)
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#define Sgl_is_signalingnan(sgl_value) (Ssignalingnan(sgl_value)==0x1ff)
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#define Sgl_isnotzero(sgl_value) (Sall(sgl_value)!=0)
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#define Sgl_isnotzero_hiddenhigh7mantissa(sgl_value) \
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    (Shiddenhigh7mantissa(sgl_value)!=0)
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#define Sgl_isnotzero_low4(sgl_value) (Slow4(sgl_value)!=0)
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#define Sgl_isnotzero_exponent(sgl_value) (Sexponent(sgl_value)!=0)
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#define Sgl_isnotzero_mantissa(sgl_value) (Smantissa(sgl_value)!=0)
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#define Sgl_isnotzero_exponentmantissa(sgl_value) \
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    (Sexponentmantissa(sgl_value)!=0)
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#define Sgl_iszero(sgl_value) (Sall(sgl_value)==0)
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#define Sgl_iszero_signaling(sgl_value) (Is_ssignaling(sgl_value)==0)
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#define Sgl_iszero_hidden(sgl_value) (Is_shidden(sgl_value)==0)
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#define Sgl_iszero_hiddenoverflow(sgl_value) \
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    (Is_shiddenoverflow(sgl_value)==0)
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#define Sgl_iszero_hiddenhigh3mantissa(sgl_value) \
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    (Shiddenhigh3mantissa(sgl_value)==0)
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#define Sgl_iszero_hiddenhigh7mantissa(sgl_value) \
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    (Shiddenhigh7mantissa(sgl_value)==0)
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#define Sgl_iszero_sign(sgl_value) (Is_ssign(sgl_value)==0)
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#define Sgl_iszero_exponent(sgl_value) (Sexponent(sgl_value)==0)
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#define Sgl_iszero_mantissa(sgl_value) (Smantissa(sgl_value)==0)
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#define Sgl_iszero_exponentmantissa(sgl_value) \
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    (Sexponentmantissa(sgl_value)==0)
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#define Sgl_isinfinity_exponent(sgl_value) 		\
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    (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT)
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#define Sgl_isnotinfinity_exponent(sgl_value) 		\
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    (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT)
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#define Sgl_isinfinity(sgl_value)			\
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    (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT &&	\
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    Sgl_mantissa(sgl_value)==0)
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#define Sgl_isnan(sgl_value)				\
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    (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT &&	\
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    Sgl_mantissa(sgl_value)!=0)
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#define Sgl_isnotnan(sgl_value)				\
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    (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT ||	\
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    Sgl_mantissa(sgl_value)==0)
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#define Sgl_islessthan(sgl_op1,sgl_op2)			\
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    (Sall(sgl_op1) < Sall(sgl_op2))
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#define Sgl_isgreaterthan(sgl_op1,sgl_op2)		\
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    (Sall(sgl_op1) > Sall(sgl_op2))
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#define Sgl_isnotlessthan(sgl_op1,sgl_op2)		\
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    (Sall(sgl_op1) >= Sall(sgl_op2))
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#define Sgl_isequal(sgl_op1,sgl_op2)			\
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    (Sall(sgl_op1) == Sall(sgl_op2))
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#define Sgl_leftshiftby8(sgl_value) \
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    Sall(sgl_value) <<= 8
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#define Sgl_leftshiftby4(sgl_value) \
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    Sall(sgl_value) <<= 4
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#define Sgl_leftshiftby3(sgl_value) \
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    Sall(sgl_value) <<= 3
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#define Sgl_leftshiftby2(sgl_value) \
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    Sall(sgl_value) <<= 2
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#define Sgl_leftshiftby1(sgl_value) \
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    Sall(sgl_value) <<= 1
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#define Sgl_rightshiftby1(sgl_value) \
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    Sall(sgl_value) >>= 1
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#define Sgl_rightshiftby4(sgl_value) \
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    Sall(sgl_value) >>= 4
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#define Sgl_rightshiftby8(sgl_value) \
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    Sall(sgl_value) >>= 8
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#define Sgl_ismagnitudeless(signlessleft,signlessright)			\
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/*  unsigned int signlessleft, signlessright; */			\
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      (signlessleft < signlessright)  
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#define Sgl_copytoint_exponentmantissa(source,dest)     \
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    dest = Sexponentmantissa(source)
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/* A quiet NaN has the high mantissa bit clear and at least on other (in this
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 * case the adjacent bit) bit set. */
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#define Sgl_set_quiet(sgl_value) Deposit_shigh2mantissa(sgl_value,1)
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#define Sgl_set_exponent(sgl_value,exp) Deposit_sexponent(sgl_value,exp)
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#define Sgl_set_mantissa(dest,value) Deposit_smantissa(dest,value)
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#define Sgl_set_exponentmantissa(dest,value) \
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    Deposit_sexponentmantissa(dest,value)
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/*  An infinity is represented with the max exponent and a zero mantissa */
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#define Sgl_setinfinity_exponent(sgl_value) \
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    Deposit_sexponent(sgl_value,SGL_INFINITY_EXPONENT)
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#define Sgl_setinfinity_exponentmantissa(sgl_value)	\
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    Deposit_sexponentmantissa(sgl_value, \
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	(SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))))
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#define Sgl_setinfinitypositive(sgl_value)		\
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    Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH)))
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#define Sgl_setinfinitynegative(sgl_value)		\
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    Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) \
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    | ((unsigned int)1<<31)
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#define Sgl_setinfinity(sgl_value,sign)					\
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    Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) | \
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     ((unsigned int)sign << 31)
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#define Sgl_sethigh4bits(sgl_value, extsign)  \
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    Deposit_shigh4(sgl_value,extsign)
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#define Sgl_set_sign(sgl_value,sign) Deposit_ssign(sgl_value,sign)
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#define Sgl_invert_sign(sgl_value)  \
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    Deposit_ssign(sgl_value,~Ssign(sgl_value))
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#define Sgl_setone_sign(sgl_value) Deposit_ssign(sgl_value,1)
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#define Sgl_setone_lowmantissa(sgl_value) Deposit_slow(sgl_value,1)
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#define Sgl_setzero_sign(sgl_value)  Sall(sgl_value) &= 0x7fffffff
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#define Sgl_setzero_exponent(sgl_value) Sall(sgl_value) &= 0x807fffff
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#define Sgl_setzero_mantissa(sgl_value) Sall(sgl_value) &= 0xff800000
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#define Sgl_setzero_exponentmantissa(sgl_value)  Sall(sgl_value) &= 0x80000000
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#define Sgl_setzero(sgl_value) Sall(sgl_value) = 0
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#define Sgl_setnegativezero(sgl_value) Sall(sgl_value) = (unsigned int)1 << 31
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/* Use following macro for both overflow & underflow conditions */
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#define ovfl -
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#define unfl +
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#define Sgl_setwrapped_exponent(sgl_value,exponent,op) \
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    Deposit_sexponent(sgl_value,(exponent op SGL_WRAP))
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#define Sgl_setlargestpositive(sgl_value) 				\
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    Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))	\
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                      | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 )
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#define Sgl_setlargestnegative(sgl_value)				\
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    Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))	\
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                      | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 )		\
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		      | ((unsigned int)1<<31)
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#define Sgl_setnegativeinfinity(sgl_value)	\
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    Sall(sgl_value) = 				\
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    ((1<<SGL_EXP_LENGTH) | SGL_INFINITY_EXPONENT) << (32-(1+SGL_EXP_LENGTH))
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#define Sgl_setlargest(sgl_value,sign) 					\
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    Sall(sgl_value) = (unsigned int)sign << 31 |			\
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        (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))		\
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	  | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
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#define Sgl_setlargest_exponentmantissa(sgl_value)			\
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    Sall(sgl_value) = Sall(sgl_value) & ((unsigned int)1<<31) |		\
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        (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))		\
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	  | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
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/* The high bit is always zero so arithmetic or logical shifts will work. */
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#define Sgl_right_align(srcdst,shift,extent)				\
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    /* sgl_floating_point srcdst; int shift; extension extent */	\
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    if (shift < 32) {							\
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	Extall(extent) = Sall(srcdst) << (32-(shift));			\
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    	Sall(srcdst) >>= shift;						\
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    }									\
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    else {								\
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	Extall(extent) = Sall(srcdst);					\
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	Sall(srcdst) = 0;						\
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    }
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#define Sgl_hiddenhigh3mantissa(sgl_value) Shiddenhigh3mantissa(sgl_value)
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#define Sgl_hidden(sgl_value) Shidden(sgl_value)
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#define Sgl_lowmantissa(sgl_value) Slow(sgl_value)
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/* The left argument is never smaller than the right argument */
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#define Sgl_subtract(sgl_left,sgl_right,sgl_result) \
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    Sall(sgl_result) = Sall(sgl_left) - Sall(sgl_right)
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/* Subtract right augmented with extension from left augmented with zeros and
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 * store into result and extension. */
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#define Sgl_subtract_withextension(left,right,extent,result)		\
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    /* sgl_floating_point left,right,result; extension extent */	\
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  Sgl_subtract(left,right,result);					\
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  if((Extall(extent) = 0-Extall(extent)))				\
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      Sall(result) = Sall(result)-1
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#define Sgl_addition(sgl_left,sgl_right,sgl_result) \
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    Sall(sgl_result) = Sall(sgl_left) + Sall(sgl_right)
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#define Sgl_xortointp1(left,right,result)			\
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    result = Sall(left) XOR Sall(right);
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#define Sgl_xorfromintp1(left,right,result)			\
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    Sall(result) = left XOR Sall(right)
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/* Need to Initialize */
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#define Sgl_makequietnan(dest)						\
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    Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH))	\
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                 | (1<<(32-(1+SGL_EXP_LENGTH+2)))
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#define Sgl_makesignalingnan(dest)					\
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    Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH))	\
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                 | (1<<(32-(1+SGL_EXP_LENGTH+1)))
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#define Sgl_normalize(sgl_opnd,exponent)			\
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	while(Sgl_iszero_hiddenhigh7mantissa(sgl_opnd)) {	\
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		Sgl_leftshiftby8(sgl_opnd);			\
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		exponent -= 8;					\
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	}							\
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	if(Sgl_iszero_hiddenhigh3mantissa(sgl_opnd)) {		\
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		Sgl_leftshiftby4(sgl_opnd);			\
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		exponent -= 4;					\
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	}							\
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	while(Sgl_iszero_hidden(sgl_opnd)) {			\
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		Sgl_leftshiftby1(sgl_opnd);			\
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		exponent -= 1;					\
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	}
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#define Sgl_setoverflow(sgl_opnd)				\
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	/* set result to infinity or largest number */		\
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	switch (Rounding_mode()) {				\
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		case ROUNDPLUS:					\
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			if (Sgl_isone_sign(sgl_opnd)) {		\
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				Sgl_setlargestnegative(sgl_opnd); \
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			}					\
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			else {					\
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				Sgl_setinfinitypositive(sgl_opnd); \
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			}					\
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			break;					\
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		case ROUNDMINUS:				\
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			if (Sgl_iszero_sign(sgl_opnd)) {	\
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				Sgl_setlargestpositive(sgl_opnd); \
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			}					\
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			else {					\
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				Sgl_setinfinitynegative(sgl_opnd); \
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			}					\
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			break;					\
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		case ROUNDNEAREST:				\
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			Sgl_setinfinity_exponentmantissa(sgl_opnd); \
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			break;					\
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		case ROUNDZERO:					\
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			Sgl_setlargest_exponentmantissa(sgl_opnd); \
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	}
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#define Sgl_denormalize(opnd,exponent,guard,sticky,inexact)		\
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	Sgl_clear_signexponent_set_hidden(opnd);			\
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	if (exponent >= (1 - SGL_P)) {					\
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		guard = (Sall(opnd) >> -exponent) & 1;			\
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		if (exponent < 0) sticky |= Sall(opnd) << (32+exponent); \
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		inexact = guard | sticky;				\
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		Sall(opnd) >>= (1-exponent);				\
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	}								\
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	else {								\
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		guard = 0;						\
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		sticky |= Sall(opnd);					\
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		inexact = sticky;					\
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		Sgl_setzero(opnd);					\
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	}
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/* 
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 * The fused multiply add instructions requires a single extended format,
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 * with 48 bits of mantissa.
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 */
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#define SGLEXT_THRESHOLD 48
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#define Sglext_setzero(valA,valB)	\
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    Sextallp1(valA) = 0; Sextallp2(valB) = 0
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#define Sglext_isnotzero_mantissap2(valB) (Sextallp2(valB)!=0)
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#define Sglext_isone_lowp1(val) (Sextlowp1(val)!=0)
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#define Sglext_isone_highp2(val) (Sexthighp2(val)!=0)
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#define Sglext_isnotzero_low31p2(val) (Sextlow31p2(val)!=0)
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#define Sglext_iszero(valA,valB) (Sextallp1(valA)==0 && Sextallp2(valB)==0)
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#define Sgl_copytoptr(src,destptr) *destptr = src
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#define Sgl_copyfromptr(srcptr,dest) dest = *srcptr
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#define Sglext_copy(srca,srcb,desta,destb) \
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    Sextallp1(desta) = Sextallp1(srca);	\
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    Sextallp2(destb) = Sextallp2(srcb)
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#define Sgl_copyto_sglext(src1,dest1,dest2) \
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	Sextallp1(dest1) = Sall(src1); Sextallp2(dest2) = 0
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#define Sglext_swap_lower(leftp2,rightp2)  \
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    Sextallp2(leftp2)  = Sextallp2(leftp2) XOR Sextallp2(rightp2);  \
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    Sextallp2(rightp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2);  \
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    Sextallp2(leftp2)  = Sextallp2(leftp2) XOR Sextallp2(rightp2)
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#define Sglext_setone_lowmantissap2(value) Deposit_dlowp2(value,1)
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/* The high bit is always zero so arithmetic or logical shifts will work. */
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#define Sglext_right_align(srcdstA,srcdstB,shift) \
336
  {int shiftamt, sticky;						\
337
    shiftamt = shift % 32;						\
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    sticky = 0;								\
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    switch (shift/32) {							\
340
     case 0: if (shiftamt > 0) {					\
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	        sticky = Sextallp2(srcdstB) << 32 - (shiftamt);		\
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                Variable_shift_double(Sextallp1(srcdstA),		\
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		 Sextallp2(srcdstB),shiftamt,Sextallp2(srcdstB));	\
344
	        Sextallp1(srcdstA) >>= shiftamt;			\
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	     }								\
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	     break;							\
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     case 1: if (shiftamt > 0) {					\
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	        sticky = (Sextallp1(srcdstA) << 32 - (shiftamt)) |	\
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			 Sextallp2(srcdstB);				\
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	     }								\
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	     else {							\
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		sticky = Sextallp2(srcdstB);				\
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	     }								\
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	     Sextallp2(srcdstB) = Sextallp1(srcdstA) >> shiftamt;	\
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	     Sextallp1(srcdstA) = 0;					\
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	     break;							\
357
    }									\
358
    if (sticky) Sglext_setone_lowmantissap2(srcdstB);			\
359
  }
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/* The left argument is never smaller than the right argument */
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#define Sglext_subtract(lefta,leftb,righta,rightb,resulta,resultb) \
363
    if( Sextallp2(rightb) > Sextallp2(leftb) ) Sextallp1(lefta)--; \
364
    Sextallp2(resultb) = Sextallp2(leftb) - Sextallp2(rightb);	\
365
    Sextallp1(resulta) = Sextallp1(lefta) - Sextallp1(righta)
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367
#define Sglext_addition(lefta,leftb,righta,rightb,resulta,resultb) \
368
    /* If the sum of the low words is less than either source, then \
369
     * an overflow into the next word occurred. */ \
370
    if ((Sextallp2(resultb) = Sextallp2(leftb)+Sextallp2(rightb)) < \
371
        Sextallp2(rightb)) \
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	    Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)+1; \
373
    else Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)
374

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376
#define Sglext_arithrightshiftby1(srcdstA,srcdstB)	\
377
    Shiftdouble(Sextallp1(srcdstA),Sextallp2(srcdstB),1,Sextallp2(srcdstB)); \
378
    Sextallp1(srcdstA) = (int)Sextallp1(srcdstA) >> 1
379
   
380
#define Sglext_leftshiftby8(valA,valB) \
381
    Shiftdouble(Sextallp1(valA),Sextallp2(valB),24,Sextallp1(valA)); \
382
    Sextallp2(valB) <<= 8
383
#define Sglext_leftshiftby4(valA,valB) \
384
    Shiftdouble(Sextallp1(valA),Sextallp2(valB),28,Sextallp1(valA)); \
385
    Sextallp2(valB) <<= 4
386
#define Sglext_leftshiftby3(valA,valB) \
387
    Shiftdouble(Sextallp1(valA),Sextallp2(valB),29,Sextallp1(valA)); \
388
    Sextallp2(valB) <<= 3
389
#define Sglext_leftshiftby2(valA,valB) \
390
    Shiftdouble(Sextallp1(valA),Sextallp2(valB),30,Sextallp1(valA)); \
391
    Sextallp2(valB) <<= 2
392
#define Sglext_leftshiftby1(valA,valB) \
393
    Shiftdouble(Sextallp1(valA),Sextallp2(valB),31,Sextallp1(valA)); \
394
    Sextallp2(valB) <<= 1
395

396
#define Sglext_rightshiftby4(valueA,valueB) \
397
    Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),4,Sextallp2(valueB)); \
398
    Sextallp1(valueA) >>= 4
399
#define Sglext_rightshiftby3(valueA,valueB) \
400
    Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),3,Sextallp2(valueB)); \
401
    Sextallp1(valueA) >>= 3
402
#define Sglext_rightshiftby1(valueA,valueB) \
403
    Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),1,Sextallp2(valueB)); \
404
    Sextallp1(valueA) >>= 1
405

406
#define Sglext_xortointp1(left,right,result) Sgl_xortointp1(left,right,result)
407
#define Sglext_xorfromintp1(left,right,result) \
408
	Sgl_xorfromintp1(left,right,result)
409
#define Sglext_copytoint_exponentmantissa(src,dest) \
410
	Sgl_copytoint_exponentmantissa(src,dest)
411
#define Sglext_ismagnitudeless(signlessleft,signlessright) \
412
	Sgl_ismagnitudeless(signlessleft,signlessright)
413

414
#define Sglext_set_sign(dbl_value,sign)  Sgl_set_sign(dbl_value,sign)  
415
#define Sglext_clear_signexponent_set_hidden(srcdst) \
416
	Sgl_clear_signexponent_set_hidden(srcdst) 
417
#define Sglext_clear_signexponent(srcdst) Sgl_clear_signexponent(srcdst) 
418
#define Sglext_clear_sign(srcdst) Sgl_clear_sign(srcdst) 
419
#define Sglext_isone_hidden(dbl_value) Sgl_isone_hidden(dbl_value) 
420

421
#define Sglext_denormalize(opndp1,opndp2,exponent,is_tiny)		\
422
  {int sticky;								\
423
    is_tiny = TRUE;							\
424
    if (exponent == 0 && Sextallp2(opndp2)) {				\
425
	switch (Rounding_mode()) {					\
426
	case ROUNDPLUS:							\
427
		if (Sgl_iszero_sign(opndp1))				\
428
			if (Sgl_isone_hiddenoverflow(opndp1 + 1))	\
429
				is_tiny = FALSE;			\
430
		break;							\
431
	case ROUNDMINUS:						\
432
		if (Sgl_isone_sign(opndp1)) {				\
433
			if (Sgl_isone_hiddenoverflow(opndp1 + 1))	\
434
				is_tiny = FALSE;			\
435
		}							\
436
		break;							\
437
	case ROUNDNEAREST:						\
438
		if (Sglext_isone_highp2(opndp2) &&			\
439
		    (Sglext_isone_lowp1(opndp1) || 			\
440
		     Sglext_isnotzero_low31p2(opndp2)))			\
441
			if (Sgl_isone_hiddenoverflow(opndp1 + 1))	\
442
				is_tiny = FALSE;			\
443
		break;							\
444
	}								\
445
    }									\
446
    Sglext_clear_signexponent_set_hidden(opndp1);			\
447
    if (exponent >= (1-DBL_P)) {					\
448
	if (exponent >= -31) {						\
449
	    if (exponent > -31) {					\
450
		sticky = Sextallp2(opndp2) << 31+exponent;		\
451
		Variable_shift_double(opndp1,opndp2,1-exponent,opndp2);	\
452
		Sextallp1(opndp1) >>= 1-exponent;			\
453
	    }								\
454
	    else {							\
455
		sticky = Sextallp2(opndp2);				\
456
		Sextallp2(opndp2) = Sextallp1(opndp1);			\
457
		Sextallp1(opndp1) = 0;					\
458
	    }								\
459
	}								\
460
	else {								\
461
	    sticky = (Sextallp1(opndp1) << 31+exponent) | 		\
462
		     Sextallp2(opndp2);					\
463
	    Sextallp2(opndp2) = Sextallp1(opndp1) >> -31-exponent;	\
464
	    Sextallp1(opndp1) = 0;					\
465
	}								\
466
    }									\
467
    else {								\
468
	sticky = Sextallp1(opndp1) | Sextallp2(opndp2);			\
469
	Sglext_setzero(opndp1,opndp2);					\
470
    }									\
471
    if (sticky) Sglext_setone_lowmantissap2(opndp2);			\
472
    exponent = 0;							\
473
  }
474

475
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