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v1.17.3: New flag handling in advance of 32-bit support

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This commit is contained in:
Jeff Parsons 2015-03-16 18:14:46 -07:00 • committed by jeffpar
commit 87f6fb6c7d
148 changed files with 7719 additions and 1581 deletions
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56
modules/pcjs/lib/x86func.js
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@ -1499,7 +1499,10 @@ X86.fnROLb = function ROLb(dst, src)
var flagsIn = (DEBUG? this.getPS() : 0);
if (src) {
var carry;
var shift = src & 0x7; // this smaller mask obviates the need to mask with this.nShiftCountMask
/*
* The following mask obviates the need to use nShiftCountMask.
*/
var shift = src & 0x7;
if (!shift) {
/*
* shift is 8, which means the new carry will come from the dst bit
@ -1534,7 +1537,10 @@ X86.fnROLw = function ROLw(dst, src)
var flagsIn = (DEBUG? this.getPS() : 0);
if (src) {
var carry;
var shift = src & 0xf; // this smaller mask obviates the need to mask with this.nShiftCountMask
/*
* The following mask obviates the need to use nShiftCountMask.
*/
var shift = src & 0xf;
if (!shift) {
carry = dst << 15;
} else {
@ -1565,11 +1571,13 @@ X86.fnRORb = function RORb(dst, src)
var flagsIn = (DEBUG? this.getPS() : 0);
if (src) {
var carry;
var shift = src & 0x7; // this smaller mask obviates the need to mask with this.nShiftCountMask
/*
* The following mask obviates the need to use nShiftCountMask.
*/
var shift = src & 0x7;
if (!shift) {
/*
* shift is 8, which means the new carry will come from the dst bit
* at position 7.
* shift is 8, which means the new carry will come from the dst bit at position 7.
*/
carry = dst;
} else {
@ -1600,11 +1608,13 @@ X86.fnRORw = function RORw(dst, src)
var flagsIn = (DEBUG? this.getPS() : 0);
if (src) {
var carry;
var shift = src & 0xf; // this smaller mask obviates the need to mask with this.nShiftCountMask
/*
* The following mask obviates the need to use nShiftCountMask.
*/
var shift = src & 0xf;
if (!shift) {
/*
* shift is 16, which means the new carry will come from the dst bit
* at position 15.
* shift is 16, which means the new carry will come from dst bit 15.
*/
carry = dst;
} else {
@ -1636,7 +1646,10 @@ X86.fnRORw = function RORw(dst, src)
X86.fnSARb = function SARb(dst, src)
{
if (src) {
if (src > 8) src = 9; // this comparison obviates the need to mask with this.nShiftCountMask
/*
* The following comparison obviates the need to mask src with nShiftCountMask.
*/
if (src > 8) src = 9;
var temp = ((dst << 24) >> 24) >> (src - 1);
dst = (temp >> 1) & 0xff;
this.setLogicResult(dst, X86.RESULT.BYTE, temp & 0x1);
@ -1659,7 +1672,10 @@ X86.fnSARb = function SARb(dst, src)
X86.fnSARw = function SARw(dst, src)
{
if (src) {
if (src > 16) src = 17; // this comparison obviates the need to mask with this.nShiftCountMask
/*
* The following comparison obviates the need to mask src with nShiftCountMask.
*/
if (src > 16) src = 17;
var temp = ((dst << 16) >> 16) >> (src - 1);
dst = (temp >> 1) & 0xffff;
this.setLogicResult(dst, X86.RESULT.WORD, temp & 0x1);
@ -1782,7 +1798,10 @@ X86.fnSHLb = function SHLb(dst, src)
var flagsIn = (DEBUG? this.getPS() : 0);
if (src) {
var carry = 0;
if (src > 8) { // this comparison obviates the need to mask with this.nShiftCountMask
/*
* The following comparison obviates the need to mask src with nShiftCountMask.
*/
if (src > 8) {
result = 0;
} else {
carry = dst << (src - 1);
@ -1812,7 +1831,10 @@ X86.fnSHLw = function SHLw(dst, src)
var flagsIn = (DEBUG? this.getPS() : 0);
if (src) {
var carry = 0;
if (src > 16) { // this comparison obviates the need to mask with this.nShiftCountMask
/*
* The following comparison obviates the need to mask src with nShiftCountMask.
*/
if (src > 16) {
result = 0;
} else {
carry = dst << (src - 1);
@ -1838,7 +1860,10 @@ X86.fnSHLw = function SHLw(dst, src)
*/
X86.fnSHRb = function SHRb(dst, src)
{
if (src) { // the following comparison obviates the need to mask with this.nShiftCountMask
if (src) {
/*
* The following comparison obviates the need to mask src with nShiftCountMask.
*/
var temp = (src > 8? 0 : (dst >> (src - 1)));
dst = (temp >> 1) & 0xff;
this.setLogicResult(dst, X86.RESULT.BYTE, temp & 0x1, dst & X86.RESULT.BYTE);
@ -1860,7 +1885,10 @@ X86.fnSHRb = function SHRb(dst, src)
*/
X86.fnSHRw = function SHRw(dst, src)
{
if (src) { // the following comparison obviates the need to mask with this.nShiftCountMask
if (src) {
/*
* The following comparison obviates the need to mask src with nShiftCountMask.
*/
var temp = (src > 16? 0 : (dst >> (src - 1)));
dst = (temp >> 1) & 0xffff;
this.setLogicResult(dst, X86.RESULT.WORD, temp & 0x1, dst & X86.RESULT.WORD);