Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Cleaned up x87 tag register handling.

Browse source
This commit is contained in:
SarahW 2018-10-01 21:02:40 +01:00
commit dbb01ef9e2
6 changed files with 82 additions and 63 deletions
Download patch file Download diff file Expand all files Collapse all files

34
src/x87.c
View file

@ -19,6 +19,11 @@
#include "x87.h"
#include "386_common.h"
#define X87_TAG_VALID 0
#define X87_TAG_ZERO 1
#define X87_TAG_INVALID 2
#define X87_TAG_EMPTY 3
uint16_t x87_gettag()
{
uint16_t ret = 0;
@ -26,10 +31,14 @@ uint16_t x87_gettag()
for (c = 0; c < 8; c++)
{
if (cpu_state.tag[c] & TAG_UINT64)
if (cpu_state.tag[c] == TAG_EMPTY)
ret |= X87_TAG_EMPTY << (c * 2);
else if (cpu_state.tag[c] & TAG_UINT64)
ret |= 2 << (c*2);
else if (cpu_state.ST[c] == 0.0)
ret |= X87_TAG_ZERO << (c * 2);
else
ret |= (cpu_state.tag[c] << (c*2));
ret |= X87_TAG_VALID << (c * 2);
}
return ret;
@ -37,14 +46,19 @@ uint16_t x87_gettag()
void x87_settag(uint16_t new_tag)
{
cpu_state.tag[0] = new_tag & 3;
cpu_state.tag[1] = (new_tag >> 2) & 3;
cpu_state.tag[2] = (new_tag >> 4) & 3;
cpu_state.tag[3] = (new_tag >> 6) & 3;
cpu_state.tag[4] = (new_tag >> 8) & 3;
cpu_state.tag[5] = (new_tag >> 10) & 3;
cpu_state.tag[6] = (new_tag >> 12) & 3;
cpu_state.tag[7] = (new_tag >> 14) & 3;
int c;
for (c = 0; c < 8; c++)
{
int tag = (new_tag >> (c * 2)) & 3;
if (tag == X87_TAG_EMPTY)
cpu_state.tag[c] = TAG_EMPTY;
else if (tag == 2)
cpu_state.tag[c] = TAG_VALID | TAG_UINT64;
else
cpu_state.tag[c] = TAG_VALID;
}
}
void x87_dumpregs()