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i386.c: x87 condition code flag C1 must be 1 in case of a stack overflow, 0 in case of a stack undeflow (nw)

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This commit is contained in:
yz70s 2015-03-03 23:00:15 +01:00
parent dd7ea6355b
commit 556b4259c9
1 changed files with 3 additions and 3 deletions
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6
src/emu/cpu/i386/x87ops.inc
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@ -226,13 +226,13 @@ void i386_device::x87_write_stack(int i, floatx80 value, int update_tag)
void i386_device::x87_set_stack_underflow() void i386_device::x87_set_stack_underflow()
{ {
m_x87_sw |= X87_SW_C1 | X87_SW_IE | X87_SW_SF; m_x87_sw &= ~X87_SW_C1;
m_x87_sw |= X87_SW_IE | X87_SW_SF;
} }
void i386_device::x87_set_stack_overflow() void i386_device::x87_set_stack_overflow()
{ {
m_x87_sw &= ~X87_SW_C1; m_x87_sw |= X87_SW_C1 | X87_SW_IE | X87_SW_SF;
m_x87_sw |= X87_SW_IE | X87_SW_SF;
} }
int i386_device::x87_inc_stack() int i386_device::x87_inc_stack()