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-v60: NEG instructions should set or clear carry based on non-zero or zero results, not based on borrow. [Ryan Holtz]

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MooglyGuy 2019-12-26 23:12:05 +01:00
parent 0e14d3f7a8
commit d0399db9b5
1 changed files with 3 additions and 7 deletions
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10
src/devices/cpu/v60/op12.hxx
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@ -1,7 +1,6 @@
// license:BSD-3-Clause
// copyright-holders:Farfetch'd, R. Belmont
/*
* MUL* and MULU* do not set OV correctly
* DIVX: the second operand should be treated as dword instead of word
* GETATE, GETPTE and GETRA should not be used
* UPDPSW: _CY and _OV must be cleared or unchanged? I suppose
@ -998,7 +997,6 @@ uint32_t v60_device::opMULB()
F12LOADOP2BYTE();
// @@@ OV not set!!
tmp = (int8_t)appb * (int32_t)(int8_t)m_op1;
appb = tmp;
_Z = (appb == 0);
@ -1017,7 +1015,6 @@ uint32_t v60_device::opMULH()
F12LOADOP2HALF();
// @@@ OV not set!!
tmp = (int16_t)apph * (int32_t)(int16_t)m_op1;
apph = tmp;
_Z = (apph == 0);
@ -1036,7 +1033,6 @@ uint32_t v60_device::opMULW()
F12LOADOP2WORD();
// @@@ OV not set!!
tmp = (int32_t)appw * (int64_t)(int32_t)m_op1;
appw = tmp;
_Z = (appw == 0);
@ -1055,7 +1051,6 @@ uint32_t v60_device::opMULUB()
F12LOADOP2BYTE();
// @@@ OV not set!!
tmp = appb * (uint8_t)m_op1;
appb = tmp;
_Z = (appb == 0);
@ -1074,7 +1069,6 @@ uint32_t v60_device::opMULUH()
F12LOADOP2HALF();
// @@@ OV not set!!
tmp = apph * (uint16_t)m_op1;
apph = tmp;
_Z = (apph == 0);
@ -1093,7 +1087,6 @@ uint32_t v60_device::opMULUW()
F12LOADOP2WORD();
// @@@ OV not set!!
tmp = (uint64_t)appw * (uint64_t)m_op1;
appw = tmp;
_Z = (appw == 0);
@ -1110,6 +1103,7 @@ uint32_t v60_device::opNEGB() /* TRUSTED (C too!)*/
m_modwritevalb = 0;
SUBB(m_modwritevalb, (int8_t)m_op1);
_CY = m_modwritevalb ? 1 : 0;
F12WriteSecondOperand(0);
F12END();
@ -1121,6 +1115,7 @@ uint32_t v60_device::opNEGH() /* TRUSTED (C too!)*/
m_modwritevalh = 0;
SUBW(m_modwritevalh, (int16_t)m_op1);
_CY = m_modwritevalh ? 1 : 0;
F12WriteSecondOperand(1);
F12END();
@ -1132,6 +1127,7 @@ uint32_t v60_device::opNEGW() /* TRUSTED (C too!)*/
m_modwritevalw = 0;
SUBL(m_modwritevalw, (int32_t)m_op1);
_CY = m_modwritevalw ? 1 : 0;
F12WriteSecondOperand(2);
F12END();