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Second part of patch 1022702. (All except addkey). Changed loading of a BCD in the fpu a bit to get more resolution and speed.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1959
This commit is contained in:
Peter Veenstra 2004-09-09 18:36:50 +00:00
parent 5c6506d1bf
commit 30f2bb7612
4 changed files with 70 additions and 12 deletions
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14
src/fpu/fpu_instructions.h
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: fpu_instructions.h,v 1.20 2004-09-08 10:33:16 qbix79 Exp $ */
/* $Id: fpu_instructions.h,v 1.21 2004-09-09 18:36:50 qbix79 Exp $ */
static void FPU_FINIT(void) {
@ -264,7 +264,7 @@ static void FPU_FBST(PhysPt addr)
static Real64 FPU_FBLD(PhysPt addr)
{
Real64 val = 0;
Bit64u val = 0;
Bitu in = 0;
Bit64u base = 1;
for(Bitu i = 0;i < 9;i++){
@ -275,11 +275,13 @@ static Real64 FPU_FBLD(PhysPt addr)
base *= 10;
}
//last number
//last number, only now convert to float in order to get
//the best signification
Real64 temp = static_cast<Real64>(val);
in = mem_readb(addr + 9);
val += ( (in&0xf) * base );
if(in&0x80) val *= -1.0;
return val;
temp += ( (in&0xf) * base );
if(in&0x80) temp *= -1.0;
return temp;
}