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Diffstat (limited to 'kernel/arch/parisc/math-emu/cnv_float.h')
| -rw-r--r-- | kernel/arch/parisc/math-emu/cnv_float.h | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/kernel/arch/parisc/math-emu/cnv_float.h b/kernel/arch/parisc/math-emu/cnv_float.h new file mode 100644 index 000000000..933423fa5 --- /dev/null +++ b/kernel/arch/parisc/math-emu/cnv_float.h @@ -0,0 +1,376 @@ +/* + * 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 + +/* + * Some more constants + */ +#define SGL_FX_MAX_EXP 30 +#define DBL_FX_MAX_EXP 62 +#define QUAD_FX_MAX_EXP 126 + +#define Dintp1(object) (object) +#define Dintp2(object) (object) + +#define Duintp1(object) (object) +#define Duintp2(object) (object) + +#define Qintp0(object) (object) +#define Qintp1(object) (object) +#define Qintp2(object) (object) +#define Qintp3(object) (object) + + +/* + * These macros will be used specifically by the convert instructions. + * + * + * Single format macros + */ + +#define Sgl_to_dbl_exponent(src_exponent,dest) \ + Deposit_dexponent(dest,src_exponent+(DBL_BIAS-SGL_BIAS)) + +#define Sgl_to_dbl_mantissa(src_mantissa,destA,destB) \ + Deposit_dmantissap1(destA,src_mantissa>>3); \ + Dmantissap2(destB) = src_mantissa << 29 + +#define Sgl_isinexact_to_fix(sgl_value,exponent) \ + ((exponent < (SGL_P - 1)) ? \ + (Sall(sgl_value) << (SGL_EXP_LENGTH + 1 + exponent)) : FALSE) + +#define Int_isinexact_to_sgl(int_value) (int_value << 33 - SGL_EXP_LENGTH) + +#define Sgl_roundnearest_from_int(int_value,sgl_value) \ + if (int_value & 1<<(SGL_EXP_LENGTH - 2)) /* round bit */ \ + if ((int_value << 34 - SGL_EXP_LENGTH) || Slow(sgl_value)) \ + Sall(sgl_value)++ + +#define Dint_isinexact_to_sgl(dint_valueA,dint_valueB) \ + ((Dintp1(dint_valueA) << 33 - SGL_EXP_LENGTH) || Dintp2(dint_valueB)) + +#define Sgl_roundnearest_from_dint(dint_valueA,dint_valueB,sgl_value) \ + if (Dintp1(dint_valueA) & 1<<(SGL_EXP_LENGTH - 2)) \ + if ((Dintp1(dint_valueA) << 34 - SGL_EXP_LENGTH) || \ + Dintp2(dint_valueB) || Slow(sgl_value)) Sall(sgl_value)++ + +#define Dint_isinexact_to_dbl(dint_value) \ + (Dintp2(dint_value) << 33 - DBL_EXP_LENGTH) + +#define Dbl_roundnearest_from_dint(dint_opndB,dbl_opndA,dbl_opndB) \ + if (Dintp2(dint_opndB) & 1<<(DBL_EXP_LENGTH - 2)) \ + if ((Dintp2(dint_opndB) << 34 - DBL_EXP_LENGTH) || Dlowp2(dbl_opndB)) \ + if ((++Dallp2(dbl_opndB))==0) Dallp1(dbl_opndA)++ + +#define Sgl_isone_roundbit(sgl_value,exponent) \ + ((Sall(sgl_value) << (SGL_EXP_LENGTH + 1 + exponent)) >> 31) + +#define Sgl_isone_stickybit(sgl_value,exponent) \ + (exponent < (SGL_P - 2) ? \ + Sall(sgl_value) << (SGL_EXP_LENGTH + 2 + exponent) : FALSE) + + +/* + * Double format macros + */ + +#define Dbl_to_sgl_exponent(src_exponent,dest) \ + dest = src_exponent + (SGL_BIAS - DBL_BIAS) + +#define Dbl_to_sgl_mantissa(srcA,srcB,dest,inexact,guard,sticky,odd) \ + Shiftdouble(Dmantissap1(srcA),Dmantissap2(srcB),29,dest); \ + guard = Dbit3p2(srcB); \ + sticky = Dallp2(srcB)<<4; \ + inexact = guard | sticky; \ + odd = Dbit2p2(srcB) + +#define Dbl_to_sgl_denormalized(srcA,srcB,exp,dest,inexact,guard,sticky,odd,tiny) \ + Deposit_dexponent(srcA,1); \ + tiny = TRUE; \ + if (exp >= -2) { \ + if (exp == 0) { \ + inexact = Dallp2(srcB) << 3; \ + guard = inexact >> 31; \ + sticky = inexact << 1; \ + Shiftdouble(Dmantissap1(srcA),Dmantissap2(srcB),29,dest); \ + odd = dest << 31; \ + if (inexact) { \ + switch(Rounding_mode()) { \ + case ROUNDPLUS: \ + if (Dbl_iszero_sign(srcA)) { \ + dest++; \ + if (Sgl_isone_hidden(dest)) \ + tiny = FALSE; \ + dest--; \ + } \ + break; \ + case ROUNDMINUS: \ + if (Dbl_isone_sign(srcA)) { \ + dest++; \ + if (Sgl_isone_hidden(dest)) \ + tiny = FALSE; \ + dest--; \ + } \ + break; \ + case ROUNDNEAREST: \ + if (guard && (sticky || odd)) { \ + dest++; \ + if (Sgl_isone_hidden(dest)) \ + tiny = FALSE; \ + dest--; \ + } \ + break; \ + } \ + } \ + /* shift right by one to get correct result */ \ + guard = odd; \ + sticky = inexact; \ + inexact |= guard; \ + dest >>= 1; \ + Deposit_dsign(srcA,0); \ + Shiftdouble(Dallp1(srcA),Dallp2(srcB),30,dest); \ + odd = dest << 31; \ + } \ + else { \ + inexact = Dallp2(srcB) << (2 + exp); \ + guard = inexact >> 31; \ + sticky = inexact << 1; \ + Deposit_dsign(srcA,0); \ + if (exp == -2) dest = Dallp1(srcA); \ + else Variable_shift_double(Dallp1(srcA),Dallp2(srcB),30-exp,dest); \ + odd = dest << 31; \ + } \ + } \ + else { \ + Deposit_dsign(srcA,0); \ + if (exp > (1 - SGL_P)) { \ + dest = Dallp1(srcA) >> (- 2 - exp); \ + inexact = Dallp1(srcA) << (34 + exp); \ + guard = inexact >> 31; \ + sticky = (inexact << 1) | Dallp2(srcB); \ + inexact |= Dallp2(srcB); \ + odd = dest << 31; \ + } \ + else { \ + dest = 0; \ + inexact = Dallp1(srcA) | Dallp2(srcB); \ + if (exp == (1 - SGL_P)) { \ + guard = Dhidden(srcA); \ + sticky = Dmantissap1(srcA) | Dallp2(srcB); \ + } \ + else { \ + guard = 0; \ + sticky = inexact; \ + } \ + odd = 0; \ + } \ + } \ + exp = 0 + +#define Dbl_isinexact_to_fix(dbl_valueA,dbl_valueB,exponent) \ + (exponent < (DBL_P-33) ? \ + Dallp2(dbl_valueB) || Dallp1(dbl_valueA) << (DBL_EXP_LENGTH+1+exponent) : \ + (exponent < (DBL_P-1) ? Dallp2(dbl_valueB) << (exponent + (33-DBL_P)) : \ + FALSE)) + +#define Dbl_isoverflow_to_int(exponent,dbl_valueA,dbl_valueB) \ + ((exponent > SGL_FX_MAX_EXP + 1) || Dsign(dbl_valueA)==0 || \ + Dmantissap1(dbl_valueA)!=0 || (Dallp2(dbl_valueB)>>21)!=0 ) + +#define Dbl_isone_roundbit(dbl_valueA,dbl_valueB,exponent) \ + ((exponent < (DBL_P - 33) ? \ + Dallp1(dbl_valueA) >> ((30 - DBL_EXP_LENGTH) - exponent) : \ + Dallp2(dbl_valueB) >> ((DBL_P - 2) - exponent)) & 1) + +#define Dbl_isone_stickybit(dbl_valueA,dbl_valueB,exponent) \ + (exponent < (DBL_P-34) ? \ + (Dallp2(dbl_valueB) || Dallp1(dbl_valueA)<<(DBL_EXP_LENGTH+2+exponent)) : \ + (exponent<(DBL_P-2) ? (Dallp2(dbl_valueB) << (exponent + (34-DBL_P))) : \ + FALSE)) + + +/* Int macros */ + +#define Int_from_sgl_mantissa(sgl_value,exponent) \ + Sall(sgl_value) = \ + (unsigned)(Sall(sgl_value) << SGL_EXP_LENGTH)>>(31 - exponent) + +#define Int_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent) \ + Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),22,Dallp1(dbl_valueA)); \ + if (exponent < 31) Dallp1(dbl_valueA) >>= 30 - exponent; \ + else Dallp1(dbl_valueA) <<= 1 + +#define Int_negate(int_value) int_value = -int_value + + +/* Dint macros */ + +#define Dint_from_sgl_mantissa(sgl_value,exponent,dresultA,dresultB) \ + {Sall(sgl_value) <<= SGL_EXP_LENGTH; /* left-justify */ \ + if (exponent <= 31) { \ + Dintp1(dresultA) = 0; \ + Dintp2(dresultB) = (unsigned)Sall(sgl_value) >> (31 - exponent); \ + } \ + else { \ + Dintp1(dresultA) = Sall(sgl_value) >> (63 - exponent); \ + Dintp2(dresultB) = Sall(sgl_value) << (exponent - 31); \ + }} + + +#define Dint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) \ + {if (exponent < 32) { \ + Dintp1(destA) = 0; \ + if (exponent <= 20) \ + Dintp2(destB) = Dallp1(dbl_valueA) >> 20-exponent; \ + else Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \ + 52-exponent,Dintp2(destB)); \ + } \ + else { \ + if (exponent <= 52) { \ + Dintp1(destA) = Dallp1(dbl_valueA) >> 52-exponent; \ + if (exponent == 52) Dintp2(destB) = Dallp2(dbl_valueB); \ + else Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \ + 52-exponent,Dintp2(destB)); \ + } \ + else { \ + Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \ + 84-exponent,Dintp1(destA)); \ + Dintp2(destB) = Dallp2(dbl_valueB) << exponent-52; \ + } \ + }} + +#define Dint_setzero(dresultA,dresultB) \ + Dintp1(dresultA) = 0; \ + Dintp2(dresultB) = 0 + +#define Dint_setone_sign(dresultA,dresultB) \ + Dintp1(dresultA) = ~Dintp1(dresultA); \ + if ((Dintp2(dresultB) = -Dintp2(dresultB)) == 0) Dintp1(dresultA)++ + +#define Dint_set_minint(dresultA,dresultB) \ + Dintp1(dresultA) = (unsigned int)1<<31; \ + Dintp2(dresultB) = 0 + +#define Dint_isone_lowp2(dresultB) (Dintp2(dresultB) & 01) + +#define Dint_increment(dresultA,dresultB) \ + if ((++Dintp2(dresultB))==0) Dintp1(dresultA)++ + +#define Dint_decrement(dresultA,dresultB) \ + if ((Dintp2(dresultB)--)==0) Dintp1(dresultA)-- + +#define Dint_negate(dresultA,dresultB) \ + Dintp1(dresultA) = ~Dintp1(dresultA); \ + if ((Dintp2(dresultB) = -Dintp2(dresultB))==0) Dintp1(dresultA)++ + +#define Dint_copyfromptr(src,destA,destB) \ + Dintp1(destA) = src->wd0; \ + Dintp2(destB) = src->wd1 +#define Dint_copytoptr(srcA,srcB,dest) \ + dest->wd0 = Dintp1(srcA); \ + dest->wd1 = Dintp2(srcB) + + +/* other macros */ + +#define Find_ms_one_bit(value, position) \ + { \ + int var; \ + for (var=8; var >=1; var >>= 1) { \ + if (value >> 32 - position) \ + position -= var; \ + else position += var; \ + } \ + if ((value >> 32 - position) == 0) \ + position--; \ + else position -= 2; \ + } + + +/* + * Unsigned int macros + */ +#define Duint_copyfromptr(src,destA,destB) \ + Dint_copyfromptr(src,destA,destB) +#define Duint_copytoptr(srcA,srcB,dest) \ + Dint_copytoptr(srcA,srcB,dest) + +#define Suint_isinexact_to_sgl(int_value) \ + (int_value << 32 - SGL_EXP_LENGTH) + +#define Sgl_roundnearest_from_suint(suint_value,sgl_value) \ + if (suint_value & 1<<(SGL_EXP_LENGTH - 1)) /* round bit */ \ + if ((suint_value << 33 - SGL_EXP_LENGTH) || Slow(sgl_value)) \ + Sall(sgl_value)++ + +#define Duint_isinexact_to_sgl(duint_valueA,duint_valueB) \ + ((Duintp1(duint_valueA) << 32 - SGL_EXP_LENGTH) || Duintp2(duint_valueB)) + +#define Sgl_roundnearest_from_duint(duint_valueA,duint_valueB,sgl_value) \ + if (Duintp1(duint_valueA) & 1<<(SGL_EXP_LENGTH - 1)) \ + if ((Duintp1(duint_valueA) << 33 - SGL_EXP_LENGTH) || \ + Duintp2(duint_valueB) || Slow(sgl_value)) Sall(sgl_value)++ + +#define Duint_isinexact_to_dbl(duint_value) \ + (Duintp2(duint_value) << 32 - DBL_EXP_LENGTH) + +#define Dbl_roundnearest_from_duint(duint_opndB,dbl_opndA,dbl_opndB) \ + if (Duintp2(duint_opndB) & 1<<(DBL_EXP_LENGTH - 1)) \ + if ((Duintp2(duint_opndB) << 33 - DBL_EXP_LENGTH) || Dlowp2(dbl_opndB)) \ + if ((++Dallp2(dbl_opndB))==0) Dallp1(dbl_opndA)++ + +#define Suint_from_sgl_mantissa(src,exponent,result) \ + Sall(result) = (unsigned)(Sall(src) << SGL_EXP_LENGTH)>>(31 - exponent) + +#define Sgl_isinexact_to_unsigned(sgl_value,exponent) \ + Sgl_isinexact_to_fix(sgl_value,exponent) + +#define Duint_from_sgl_mantissa(sgl_value,exponent,dresultA,dresultB) \ + {unsigned int val = Sall(sgl_value) << SGL_EXP_LENGTH; \ + if (exponent <= 31) { \ + Dintp1(dresultA) = 0; \ + Dintp2(dresultB) = val >> (31 - exponent); \ + } \ + else { \ + Dintp1(dresultA) = val >> (63 - exponent); \ + Dintp2(dresultB) = exponent <= 62 ? val << (exponent - 31) : 0; \ + } \ + } + +#define Duint_setzero(dresultA,dresultB) \ + Dint_setzero(dresultA,dresultB) + +#define Duint_increment(dresultA,dresultB) Dint_increment(dresultA,dresultB) + +#define Duint_isone_lowp2(dresultB) Dint_isone_lowp2(dresultB) + +#define Suint_from_dbl_mantissa(srcA,srcB,exponent,dest) \ + Shiftdouble(Dallp1(srcA),Dallp2(srcB),21,dest); \ + dest = (unsigned)dest >> 31 - exponent + +#define Dbl_isinexact_to_unsigned(dbl_valueA,dbl_valueB,exponent) \ + Dbl_isinexact_to_fix(dbl_valueA,dbl_valueB,exponent) + +#define Duint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) \ + Dint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) |