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changes fcom flags. applied changes from c2wood to the cvs (modified them to match)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1268
This commit is contained in:
Peter Veenstra 2003-09-24 19:46:36 +00:00
parent e195ea341e
commit 1b31d7c835
1 changed files with 14 additions and 7 deletions
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21
src/fpu/fpu_instructions.h
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@ -16,6 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: fpu_instructions.h,v 1.12 2003-09-24 19:46:36 qbix79 Exp $ */
static void FPU_FINIT(void) {
@ -156,16 +157,16 @@ static void FPU_FST(Bitu st, Bitu other){
static void FPU_FCOM(Bitu st, Bitu other){
if((fpu.tags[st] != TAG_Valid) || (fpu.tags[other] != TAG_Valid)){
FPU_SET_C3(1);FPU_SET_C2(1);FPU_SET_C1(1);FPU_SET_C0(1);return;
FPU_SET_C3(1);FPU_SET_C1(1);FPU_SET_C0(1);return;
}
if(fpu.regs[st].d == fpu.regs[other].d){
FPU_SET_C3(1);FPU_SET_C2(0);FPU_SET_C1(0);FPU_SET_C0(0);return;
FPU_SET_C3(1);FPU_SET_C1(0);FPU_SET_C0(0);return;
}
if(fpu.regs[st].d < fpu.regs[other].d){
FPU_SET_C3(0);FPU_SET_C2(0);FPU_SET_C1(0);FPU_SET_C0(1);return;
FPU_SET_C3(0);FPU_SET_C1(0);FPU_SET_C0(1);return;
}
// st > other
FPU_SET_C3(0);FPU_SET_C2(0);FPU_SET_C1(0);FPU_SET_C0(0);return;
FPU_SET_C3(0);FPU_SET_C1(0);FPU_SET_C0(0);return;
}
static void FPU_FUCOM(Bitu st, Bitu other){
@ -175,8 +176,10 @@ static void FPU_FUCOM(Bitu st, Bitu other){
static double FROUND(double in){
switch(fpu.round){
case ROUND_Nearest:
return((in-floor(in)>=0.5)?(floor(in)+1):(floor(in)));
case ROUND_Nearest:
if (in-floor(in)>0.5) return (floor(in)+1);
else if (in-floor(in)<0.5) return (floor(in));
else return (((static_cast<Bit64s>(floor(in)))&1)!=0)?(floor(in)+1):(floor(in));
break;
case ROUND_Down:
return (floor(in));
@ -197,9 +200,13 @@ static void FPU_FPREM(void){
Real64 valtop = fpu.regs[TOP].d;
Real64 valdiv = fpu.regs[ST(1)].d;
Real64 res = floor(valtop/valdiv);
Bit64s ressaved = static_cast<Bit64s>(res);
res=valtop - res*valdiv;
fpu.regs[TOP].d = res;
FPU_SET_C3(0);FPU_SET_C2(0);FPU_SET_C1(0);FPU_SET_C0(0);
FPU_SET_C3(static_cast<Bitu>(ressaved&4));
FPU_SET_C2(static_cast<Bitu>(ressaved&2));
FPU_SET_C1(static_cast<Bitu>(ressaved&1));
FPU_SET_C0(0);
}
static void FPU_FXAM(void){