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

8087 FNINIT initialises control word to 0x3ff. Fixes FPU detection on Xi8088.

Browse source
This commit is contained in:
SarahW 2020-02-09 17:55:28 +00:00
commit a77fd1e7f5
1 changed files with 4 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

5
src/x87_ops_misc.h
View file

@ -58,7 +58,10 @@ static int opFINIT(uint32_t fetchdat)
{ {
FP_ENTER(); FP_ENTER();
cpu_state.pc++; cpu_state.pc++;
cpu_state.npxc = 0x37F; if (fpu_type == FPU_8087)
cpu_state.npxc = 0x3ff;
else
cpu_state.npxc = 0x37f;
codegen_set_rounding_mode(X87_ROUNDING_NEAREST); codegen_set_rounding_mode(X87_ROUNDING_NEAREST);
cpu_state.npxs = 0; cpu_state.npxs = 0;
*(uint64_t *)cpu_state.tag = 0; *(uint64_t *)cpu_state.tag = 0;