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Added FPU support for pre-486 CPUs.

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This commit does not include timings for 8087, 80287 or 80387 FPUs, these will
be added later. It also does not restrict the use of 486 and later FPU
instructions.
This commit is contained in:
SarahW 2020-01-22 20:53:13 +00:00
commit 0e8926936d
11 changed files with 1349 additions and 919 deletions
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76
src/808x.c
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@ -1104,6 +1104,8 @@ static void rep(int fv)
static int inhlt=0;
static int skipnextprint=0;
#include "8087.h"
void execx86(int cycs)
{
uint8_t temp,temp2;
@ -2945,10 +2947,78 @@ void execx86(int cycs)
AL=readmemb(ds+addr);
cycles-=11;
break;
case 0xD9: case 0xDA: case 0xDB: case 0xDD: /*ESCAPE*/
case 0xDC: case 0xDE: case 0xDF: case 0xD8:
case 0xd8:
fetchea();
geteab();
if (hasfpu)
{
uint16_t save_pc = cpu_state.pc;
ops_808x_fpu_d8_a16[rmdat >> 3](rmdat);
cpu_state.pc = save_pc;
}
break;
case 0xd9:
fetchea();
if (hasfpu)
{
uint16_t save_pc = cpu_state.pc;
ops_808x_fpu_d9_a16[rmdat](rmdat);
cpu_state.pc = save_pc;
}
break;
case 0xda:
fetchea();
if (hasfpu)
{
uint16_t save_pc = cpu_state.pc;
ops_808x_fpu_da_a16[rmdat](rmdat);
cpu_state.pc = save_pc;
}
break;
case 0xdb:
fetchea();
if (hasfpu)
{
uint16_t save_pc = cpu_state.pc;
ops_808x_fpu_db_a16[rmdat](rmdat);
cpu_state.pc = save_pc;
}
break;
case 0xdc:
fetchea();
if (hasfpu)
{
uint16_t save_pc = cpu_state.pc;
ops_808x_fpu_dc_a16[rmdat >> 3](rmdat);
cpu_state.pc = save_pc;
}
break;
case 0xdd:
fetchea();
if (hasfpu)
{
uint16_t save_pc = cpu_state.pc;
ops_808x_fpu_dd_a16[rmdat](rmdat);
cpu_state.pc = save_pc;
}
break;
case 0xde:
fetchea();
if (hasfpu)
{
uint16_t save_pc = cpu_state.pc;
ops_808x_fpu_de_a16[rmdat](rmdat);
cpu_state.pc = save_pc;
}
break;
case 0xdf:
fetchea();
if (hasfpu)
{
uint16_t save_pc = cpu_state.pc;
ops_808x_fpu_df_a16[rmdat](rmdat);
cpu_state.pc = save_pc;
}
break;
case 0xE0: /*LOOPNE*/