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-rw-r--r--arch/parisc/math-emu/cnv_float.h376
1 files changed, 376 insertions, 0 deletions
diff --git a/arch/parisc/math-emu/cnv_float.h b/arch/parisc/math-emu/cnv_float.h
new file mode 100644
index 000000000..933423fa5
--- /dev/null
+++ b/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)
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