diff options
Diffstat (limited to 'drivers/FPU-emu/reg_mul.c')
| -rw-r--r-- | drivers/FPU-emu/reg_mul.c | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/drivers/FPU-emu/reg_mul.c b/drivers/FPU-emu/reg_mul.c deleted file mode 100644 index 75246187b..000000000 --- a/drivers/FPU-emu/reg_mul.c +++ /dev/null @@ -1,105 +0,0 @@ -/*---------------------------------------------------------------------------+ - | reg_mul.c | - | | - | Multiply one FPU_REG by another, put the result in a destination FPU_REG. | - | | - | Copyright (C) 1992,1993 | - | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | - | Australia. E-mail billm@vaxc.cc.monash.edu.au | - | | - | | - +---------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------+ - | The destination may be any FPU_REG, including one of the source FPU_REGs. | - +---------------------------------------------------------------------------*/ - -#include "exception.h" -#include "reg_constant.h" -#include "fpu_emu.h" -#include "fpu_system.h" - - -/* This routine must be called with non-empty source registers */ -int reg_mul(FPU_REG const *a, FPU_REG const *b, - FPU_REG *dest, unsigned int control_w) -{ - char saved_sign = dest->sign; - char sign = (a->sign ^ b->sign); - - if (!(a->tag | b->tag)) - { - /* Both regs Valid, this should be the most common case. */ - dest->sign = sign; - if ( reg_u_mul(a, b, dest, control_w) ) - { - dest->sign = saved_sign; - return 1; - } - return 0; - } - else if ((a->tag <= TW_Zero) && (b->tag <= TW_Zero)) - { -#ifdef DENORM_OPERAND - if ( ((b->tag == TW_Valid) && (b->exp <= EXP_UNDER)) || - ((a->tag == TW_Valid) && (a->exp <= EXP_UNDER)) ) - { - if ( denormal_operand() ) return 1; - } -#endif DENORM_OPERAND - /* Must have either both arguments == zero, or - one valid and the other zero. - The result is therefore zero. */ - reg_move(&CONST_Z, dest); - /* The 80486 book says that the answer is +0, but a real - 80486 behaves this way. - IEEE-754 apparently says it should be this way. */ - dest->sign = sign; - return 0; - } - else - { - /* Must have infinities, NaNs, etc */ - if ( (a->tag == TW_NaN) || (b->tag == TW_NaN) ) - { return real_2op_NaN(a, b, dest); } - else if (a->tag == TW_Infinity) - { - if (b->tag == TW_Zero) - { return arith_invalid(dest); } /* Zero*Infinity is invalid */ - else - { -#ifdef DENORM_OPERAND - if ( (b->tag == TW_Valid) && (b->exp <= EXP_UNDER) && - denormal_operand() ) - return 1; -#endif DENORM_OPERAND - reg_move(a, dest); - dest->sign = sign; - } - return 0; - } - else if (b->tag == TW_Infinity) - { - if (a->tag == TW_Zero) - { return arith_invalid(dest); } /* Zero*Infinity is invalid */ - else - { -#ifdef DENORM_OPERAND - if ( (a->tag == TW_Valid) && (a->exp <= EXP_UNDER) && - denormal_operand() ) - return 1; -#endif DENORM_OPERAND - reg_move(b, dest); - dest->sign = sign; - } - return 0; - } -#ifdef PARANOID - else - { - EXCEPTION(EX_INTERNAL|0x102); - return 1; - } -#endif PARANOID - } -} |