valter/dosbox-staging
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added F2XM1,FYL2X,FSCALE

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changed flags in FCOM


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1163
This commit is contained in:
Peter Veenstra 2003-07-26 12:02:26 +00:00
parent 5f169bf3cf
commit 7e11075f08
1 changed files with 18 additions and 4 deletions
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22
src/fpu/fpu_instructions.h
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@ -156,16 +156,16 @@ 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_C1(1);FPU_SET_C0(1);return;
FPU_SET_C3(1);FPU_SET_C2(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_C1(0);FPU_SET_C0(0);return;
FPU_SET_C3(1);FPU_SET_C2(0);FPU_SET_C1(0);FPU_SET_C0(0);return;
}
if(fpu.regs[st].d < fpu.regs[other].d){
FPU_SET_C3(0);FPU_SET_C1(0);FPU_SET_C0(1);return;
FPU_SET_C3(0);FPU_SET_C2(0);FPU_SET_C1(0);FPU_SET_C0(1);return;
}
// st > other
FPU_SET_C3(0);FPU_SET_C1(0);FPU_SET_C0(0);return;
FPU_SET_C3(0);FPU_SET_C2(0);FPU_SET_C1(0);FPU_SET_C0(0);return;
}
static void FPU_FUCOM(Bitu st, Bitu other){
@ -297,4 +297,18 @@ static void FPU_ST80(PhysPt addr)
mem_writew(addr+8,test.begin);
}
static void FPU_F2XM1(void){
fpu.regs[TOP].d=pow(2.0,fpu.regs[TOP].d) -1;
return;
}
static void FPU_FYL2X(void){
fpu.regs[ST(1)].d*=log(fpu.regs[TOP].d)/log(2);
FPU_FPOP();
return;
}
static void FPU_FSCALE(void){
fpu.regs[TOP].d *=pow(2.0,static_cast<Real64>(static_cast<Bit64s>(FROUND(fpu.regs[ST(1)].d))));
return; //2^x where x is chopped.
}