Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-22 08:22:15 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

i386: fix over/underflow result and zero div (nw)

Browse Source
This commit is contained in:
cracyc 2019-12-30 09:56:24 -06:00
parent 018830967a
commit aeeefebf31
2 changed files with 21 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/devices/cpu/i386/i386.h
View File

@ -1357,7 +1357,7 @@ protected:
inline void x87_set_stack_overflow();
int x87_inc_stack();
int x87_dec_stack();
int x87_check_exceptions();
int x87_check_exceptions(bool store = false);
int x87_mf_fault();
inline void x87_write_cw(uint16_t cw);
void x87_reset();

32
src/devices/cpu/i386/x87ops.hxx
View File

@ -150,7 +150,7 @@ uint32_t i386_device::Getx87EA(uint8_t modrm, int rwn)
return ret;
}
int i386_device::x87_check_exceptions()
int i386_device::x87_check_exceptions(bool store)
{
m_x87_cs = m_sreg[CS].selector;
if (PROTECTED_MODE && !V8086_MODE)
@ -179,7 +179,13 @@ int i386_device::x87_check_exceptions()
m_x87_sw |= X87_SW_PE;
float_exception_flags &= ~float_flag_inexact;
}
if (float_exception_flags & float_flag_divbyzero)
{
m_x87_sw |= X87_SW_ZE;
float_exception_flags &= ~float_flag_divbyzero;
}
uint16_t unmasked = (m_x87_sw & ~m_x87_cw) & 0x3f;
if ((m_x87_sw & ~m_x87_cw) & 0x3f)
{
// m_device->execute().set_input_line(INPUT_LINE_FERR, RAISE_LINE);
@ -187,6 +193,8 @@ int i386_device::x87_check_exceptions()
// interrupt handler
m_x87_sw |= X87_SW_ES;
m_ferr_handler(1);
if (store || !(unmasked & (X87_SW_OE | X87_SW_UE)))
return 0;
}
return 1;
@ -2935,7 +2943,7 @@ void i386_device::x87_fst_m32real(uint8_t modrm)
value = ST(0);
}
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
uint32_t m32real = floatx80_to_float32(value);
WRITE32(ea, m32real);
@ -2962,7 +2970,7 @@ void i386_device::x87_fst_m64real(uint8_t modrm)
value = ST(0);
}
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
uint64_t m64real = floatx80_to_float64(value);
WRITE64(ea, m64real);
@ -3016,7 +3024,7 @@ void i386_device::x87_fstp_m32real(uint8_t modrm)
value = ST(0);
}
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
uint32_t m32real = floatx80_to_float32(value);
WRITE32(ea, m32real);
@ -3045,7 +3053,7 @@ void i386_device::x87_fstp_m64real(uint8_t modrm)
uint32_t ea = Getx87EA(modrm, 1);
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
uint64_t m64real = floatx80_to_float64(value);
WRITE64(ea, m64real);
@ -3073,7 +3081,7 @@ void i386_device::x87_fstp_m80real(uint8_t modrm)
}
uint32_t ea = Getx87EA(modrm, 1);
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
WRITE80(ea, value);
x87_inc_stack();
@ -3139,7 +3147,7 @@ void i386_device::x87_fist_m16int(uint8_t modrm)
}
uint32_t ea = Getx87EA(modrm, 1);
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
WRITE16(ea, m16int);
}
@ -3174,7 +3182,7 @@ void i386_device::x87_fist_m32int(uint8_t modrm)
}
uint32_t ea = Getx87EA(modrm, 1);
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
WRITE32(ea, m32int);
}
@ -3209,7 +3217,7 @@ if (X87_IS_ST_EMPTY(0))
}
uint32_t ea = Getx87EA(modrm, 1);
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
WRITE16(ea, m16int);
x87_inc_stack();
@ -3245,7 +3253,7 @@ void i386_device::x87_fistp_m32int(uint8_t modrm)
}
uint32_t ea = Getx87EA(modrm, 1);
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
WRITE32(ea, m32int);
x87_inc_stack();
@ -3281,7 +3289,7 @@ void i386_device::x87_fistp_m64int(uint8_t modrm)
}
uint32_t ea = Getx87EA(modrm, 1);
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
WRITE64(ea, m64int);
x87_inc_stack();
@ -3318,7 +3326,7 @@ void i386_device::x87_fbstp(uint8_t modrm)
}
uint32_t ea = Getx87EA(modrm, 1);
if (x87_check_exceptions())
if (x87_check_exceptions(true))
{
WRITE80(ea, result);
x87_inc_stack();