377 lines
13 KiB
C
377 lines
13 KiB
C
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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) <bame@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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/*
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* Some more constants
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*/
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#define SGL_FX_MAX_EXP 30
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#define DBL_FX_MAX_EXP 62
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#define QUAD_FX_MAX_EXP 126
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#define Dintp1(object) (object)
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#define Dintp2(object) (object)
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#define Duintp1(object) (object)
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#define Duintp2(object) (object)
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#define Qintp0(object) (object)
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#define Qintp1(object) (object)
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#define Qintp2(object) (object)
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#define Qintp3(object) (object)
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/*
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* These macros will be used specifically by the convert instructions.
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*
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*
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* Single format macros
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*/
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#define Sgl_to_dbl_exponent(src_exponent,dest) \
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Deposit_dexponent(dest,src_exponent+(DBL_BIAS-SGL_BIAS))
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#define Sgl_to_dbl_mantissa(src_mantissa,destA,destB) \
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Deposit_dmantissap1(destA,src_mantissa>>3); \
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Dmantissap2(destB) = src_mantissa << 29
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#define Sgl_isinexact_to_fix(sgl_value,exponent) \
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((exponent < (SGL_P - 1)) ? \
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(Sall(sgl_value) << (SGL_EXP_LENGTH + 1 + exponent)) : FALSE)
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#define Int_isinexact_to_sgl(int_value) ((int_value << 33 - SGL_EXP_LENGTH) != 0)
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#define Sgl_roundnearest_from_int(int_value,sgl_value) \
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if (int_value & 1<<(SGL_EXP_LENGTH - 2)) /* round bit */ \
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if (((int_value << 34 - SGL_EXP_LENGTH) != 0) || Slow(sgl_value)) \
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Sall(sgl_value)++
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#define Dint_isinexact_to_sgl(dint_valueA,dint_valueB) \
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(((Dintp1(dint_valueA) << 33 - SGL_EXP_LENGTH) != 0) || Dintp2(dint_valueB))
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#define Sgl_roundnearest_from_dint(dint_valueA,dint_valueB,sgl_value) \
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if (Dintp1(dint_valueA) & 1<<(SGL_EXP_LENGTH - 2)) \
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if (((Dintp1(dint_valueA) << 34 - SGL_EXP_LENGTH) != 0) || \
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Dintp2(dint_valueB) || Slow(sgl_value)) Sall(sgl_value)++
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#define Dint_isinexact_to_dbl(dint_value) \
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(Dintp2(dint_value) << 33 - DBL_EXP_LENGTH)
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#define Dbl_roundnearest_from_dint(dint_opndB,dbl_opndA,dbl_opndB) \
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if (Dintp2(dint_opndB) & 1<<(DBL_EXP_LENGTH - 2)) \
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if ((Dintp2(dint_opndB) << 34 - DBL_EXP_LENGTH) || Dlowp2(dbl_opndB)) \
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if ((++Dallp2(dbl_opndB))==0) Dallp1(dbl_opndA)++
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#define Sgl_isone_roundbit(sgl_value,exponent) \
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((Sall(sgl_value) << (SGL_EXP_LENGTH + 1 + exponent)) >> 31)
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#define Sgl_isone_stickybit(sgl_value,exponent) \
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(exponent < (SGL_P - 2) ? \
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Sall(sgl_value) << (SGL_EXP_LENGTH + 2 + exponent) : FALSE)
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/*
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* Double format macros
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*/
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#define Dbl_to_sgl_exponent(src_exponent,dest) \
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dest = src_exponent + (SGL_BIAS - DBL_BIAS)
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#define Dbl_to_sgl_mantissa(srcA,srcB,dest,inexact,guard,sticky,odd) \
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Shiftdouble(Dmantissap1(srcA),Dmantissap2(srcB),29,dest); \
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guard = Dbit3p2(srcB); \
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sticky = Dallp2(srcB)<<4; \
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inexact = guard | sticky; \
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odd = Dbit2p2(srcB)
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#define Dbl_to_sgl_denormalized(srcA,srcB,exp,dest,inexact,guard,sticky,odd,tiny) \
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Deposit_dexponent(srcA,1); \
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tiny = TRUE; \
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if (exp >= -2) { \
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if (exp == 0) { \
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inexact = Dallp2(srcB) << 3; \
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guard = inexact >> 31; \
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sticky = inexact << 1; \
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Shiftdouble(Dmantissap1(srcA),Dmantissap2(srcB),29,dest); \
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odd = dest << 31; \
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if (inexact) { \
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switch(Rounding_mode()) { \
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case ROUNDPLUS: \
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if (Dbl_iszero_sign(srcA)) { \
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dest++; \
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if (Sgl_isone_hidden(dest)) \
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tiny = FALSE; \
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dest--; \
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} \
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break; \
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case ROUNDMINUS: \
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if (Dbl_isone_sign(srcA)) { \
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dest++; \
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if (Sgl_isone_hidden(dest)) \
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tiny = FALSE; \
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dest--; \
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} \
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break; \
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case ROUNDNEAREST: \
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if (guard && (sticky || odd)) { \
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dest++; \
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if (Sgl_isone_hidden(dest)) \
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tiny = FALSE; \
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dest--; \
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} \
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break; \
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} \
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} \
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/* shift right by one to get correct result */ \
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guard = odd; \
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sticky = inexact; \
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inexact |= guard; \
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dest >>= 1; \
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Deposit_dsign(srcA,0); \
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Shiftdouble(Dallp1(srcA),Dallp2(srcB),30,dest); \
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odd = dest << 31; \
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} \
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else { \
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inexact = Dallp2(srcB) << (2 + exp); \
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guard = inexact >> 31; \
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sticky = inexact << 1; \
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Deposit_dsign(srcA,0); \
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if (exp == -2) dest = Dallp1(srcA); \
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else Variable_shift_double(Dallp1(srcA),Dallp2(srcB),30-exp,dest); \
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odd = dest << 31; \
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} \
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} \
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else { \
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Deposit_dsign(srcA,0); \
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if (exp > (1 - SGL_P)) { \
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dest = Dallp1(srcA) >> (- 2 - exp); \
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inexact = Dallp1(srcA) << (34 + exp); \
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guard = inexact >> 31; \
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sticky = (inexact << 1) | Dallp2(srcB); \
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inexact |= Dallp2(srcB); \
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odd = dest << 31; \
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} \
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else { \
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dest = 0; \
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inexact = Dallp1(srcA) | Dallp2(srcB); \
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if (exp == (1 - SGL_P)) { \
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guard = Dhidden(srcA); \
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sticky = Dmantissap1(srcA) | Dallp2(srcB); \
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} \
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else { \
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guard = 0; \
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sticky = inexact; \
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} \
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odd = 0; \
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} \
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} \
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exp = 0
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#define Dbl_isinexact_to_fix(dbl_valueA,dbl_valueB,exponent) \
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(exponent < (DBL_P-33) ? \
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Dallp2(dbl_valueB) || Dallp1(dbl_valueA) << (DBL_EXP_LENGTH+1+exponent) : \
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(exponent < (DBL_P-1) ? Dallp2(dbl_valueB) << (exponent + (33-DBL_P)) : \
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FALSE))
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#define Dbl_isoverflow_to_int(exponent,dbl_valueA,dbl_valueB) \
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((exponent > SGL_FX_MAX_EXP + 1) || Dsign(dbl_valueA)==0 || \
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Dmantissap1(dbl_valueA)!=0 || (Dallp2(dbl_valueB)>>21)!=0 )
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#define Dbl_isone_roundbit(dbl_valueA,dbl_valueB,exponent) \
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((exponent < (DBL_P - 33) ? \
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Dallp1(dbl_valueA) >> ((30 - DBL_EXP_LENGTH) - exponent) : \
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Dallp2(dbl_valueB) >> ((DBL_P - 2) - exponent)) & 1)
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#define Dbl_isone_stickybit(dbl_valueA,dbl_valueB,exponent) \
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(exponent < (DBL_P-34) ? \
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(Dallp2(dbl_valueB) || Dallp1(dbl_valueA)<<(DBL_EXP_LENGTH+2+exponent)) : \
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(exponent<(DBL_P-2) ? (Dallp2(dbl_valueB) << (exponent + (34-DBL_P))) : \
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FALSE))
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/* Int macros */
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#define Int_from_sgl_mantissa(sgl_value,exponent) \
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Sall(sgl_value) = \
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(unsigned)(Sall(sgl_value) << SGL_EXP_LENGTH)>>(31 - exponent)
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#define Int_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent) \
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Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),22,Dallp1(dbl_valueA)); \
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if (exponent < 31) Dallp1(dbl_valueA) >>= 30 - exponent; \
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else Dallp1(dbl_valueA) <<= 1
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#define Int_negate(int_value) int_value = -int_value
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/* Dint macros */
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#define Dint_from_sgl_mantissa(sgl_value,exponent,dresultA,dresultB) \
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{Sall(sgl_value) <<= SGL_EXP_LENGTH; /* left-justify */ \
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if (exponent <= 31) { \
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Dintp1(dresultA) = 0; \
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Dintp2(dresultB) = (unsigned)Sall(sgl_value) >> (31 - exponent); \
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} \
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else { \
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Dintp1(dresultA) = Sall(sgl_value) >> (63 - exponent); \
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Dintp2(dresultB) = Sall(sgl_value) << (exponent - 31); \
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}}
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#define Dint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) \
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{if (exponent < 32) { \
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Dintp1(destA) = 0; \
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if (exponent <= 20) \
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Dintp2(destB) = Dallp1(dbl_valueA) >> 20-exponent; \
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else Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \
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52-exponent,Dintp2(destB)); \
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} \
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else { \
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if (exponent <= 52) { \
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Dintp1(destA) = Dallp1(dbl_valueA) >> 52-exponent; \
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if (exponent == 52) Dintp2(destB) = Dallp2(dbl_valueB); \
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else Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \
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52-exponent,Dintp2(destB)); \
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} \
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else { \
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Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \
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84-exponent,Dintp1(destA)); \
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Dintp2(destB) = Dallp2(dbl_valueB) << exponent-52; \
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} \
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}}
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#define Dint_setzero(dresultA,dresultB) \
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Dintp1(dresultA) = 0; \
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Dintp2(dresultB) = 0
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#define Dint_setone_sign(dresultA,dresultB) \
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Dintp1(dresultA) = ~Dintp1(dresultA); \
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if ((Dintp2(dresultB) = -Dintp2(dresultB)) == 0) Dintp1(dresultA)++
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#define Dint_set_minint(dresultA,dresultB) \
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Dintp1(dresultA) = (unsigned int)1<<31; \
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Dintp2(dresultB) = 0
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#define Dint_isone_lowp2(dresultB) (Dintp2(dresultB) & 01)
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#define Dint_increment(dresultA,dresultB) \
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if ((++Dintp2(dresultB))==0) Dintp1(dresultA)++
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#define Dint_decrement(dresultA,dresultB) \
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if ((Dintp2(dresultB)--)==0) Dintp1(dresultA)--
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#define Dint_negate(dresultA,dresultB) \
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Dintp1(dresultA) = ~Dintp1(dresultA); \
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if ((Dintp2(dresultB) = -Dintp2(dresultB))==0) Dintp1(dresultA)++
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#define Dint_copyfromptr(src,destA,destB) \
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Dintp1(destA) = src->wd0; \
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Dintp2(destB) = src->wd1
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#define Dint_copytoptr(srcA,srcB,dest) \
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dest->wd0 = Dintp1(srcA); \
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dest->wd1 = Dintp2(srcB)
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/* other macros */
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#define Find_ms_one_bit(value, position) \
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{ \
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int var; \
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for (var=8; var >=1; var >>= 1) { \
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if (value >> 32 - position) \
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position -= var; \
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else position += var; \
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} \
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if ((value >> 32 - position) == 0) \
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position--; \
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else position -= 2; \
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}
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/*
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* Unsigned int macros
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*/
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#define Duint_copyfromptr(src,destA,destB) \
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Dint_copyfromptr(src,destA,destB)
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#define Duint_copytoptr(srcA,srcB,dest) \
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Dint_copytoptr(srcA,srcB,dest)
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#define Suint_isinexact_to_sgl(int_value) \
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(int_value << 32 - SGL_EXP_LENGTH)
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#define Sgl_roundnearest_from_suint(suint_value,sgl_value) \
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if (suint_value & 1<<(SGL_EXP_LENGTH - 1)) /* round bit */ \
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if ((suint_value << 33 - SGL_EXP_LENGTH) || Slow(sgl_value)) \
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Sall(sgl_value)++
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#define Duint_isinexact_to_sgl(duint_valueA,duint_valueB) \
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((Duintp1(duint_valueA) << 32 - SGL_EXP_LENGTH) || Duintp2(duint_valueB))
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#define Sgl_roundnearest_from_duint(duint_valueA,duint_valueB,sgl_value) \
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if (Duintp1(duint_valueA) & 1<<(SGL_EXP_LENGTH - 1)) \
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if ((Duintp1(duint_valueA) << 33 - SGL_EXP_LENGTH) || \
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Duintp2(duint_valueB) || Slow(sgl_value)) Sall(sgl_value)++
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#define Duint_isinexact_to_dbl(duint_value) \
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(Duintp2(duint_value) << 32 - DBL_EXP_LENGTH)
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#define Dbl_roundnearest_from_duint(duint_opndB,dbl_opndA,dbl_opndB) \
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if (Duintp2(duint_opndB) & 1<<(DBL_EXP_LENGTH - 1)) \
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if ((Duintp2(duint_opndB) << 33 - DBL_EXP_LENGTH) || Dlowp2(dbl_opndB)) \
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if ((++Dallp2(dbl_opndB))==0) Dallp1(dbl_opndA)++
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#define Suint_from_sgl_mantissa(src,exponent,result) \
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Sall(result) = (unsigned)(Sall(src) << SGL_EXP_LENGTH)>>(31 - exponent)
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#define Sgl_isinexact_to_unsigned(sgl_value,exponent) \
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Sgl_isinexact_to_fix(sgl_value,exponent)
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#define Duint_from_sgl_mantissa(sgl_value,exponent,dresultA,dresultB) \
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{unsigned int val = Sall(sgl_value) << SGL_EXP_LENGTH; \
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if (exponent <= 31) { \
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Dintp1(dresultA) = 0; \
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Dintp2(dresultB) = val >> (31 - exponent); \
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} \
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else { \
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Dintp1(dresultA) = val >> (63 - exponent); \
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Dintp2(dresultB) = exponent <= 62 ? val << (exponent - 31) : 0; \
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} \
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}
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#define Duint_setzero(dresultA,dresultB) \
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Dint_setzero(dresultA,dresultB)
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#define Duint_increment(dresultA,dresultB) Dint_increment(dresultA,dresultB)
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#define Duint_isone_lowp2(dresultB) Dint_isone_lowp2(dresultB)
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#define Suint_from_dbl_mantissa(srcA,srcB,exponent,dest) \
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Shiftdouble(Dallp1(srcA),Dallp2(srcB),21,dest); \
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dest = (unsigned)dest >> 31 - exponent
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#define Dbl_isinexact_to_unsigned(dbl_valueA,dbl_valueB,exponent) \
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Dbl_isinexact_to_fix(dbl_valueA,dbl_valueB,exponent)
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#define Duint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) \
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Dint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB)
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