valter/dosbox-staging
1
0
Fork 0
Code Releases Activity

Fix for timing/crashings problem caused by large count when used with scas/cmps

Browse source 
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1150
This commit is contained in:
Sjoerd van der Berg 2003-07-25 11:15:08 +00:00
parent 7a0bfeb194
commit 41d13152f4
1 changed files with 6 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
src/cpu/core_full/string.h
View file

@ -31,7 +31,6 @@
} else {
/* Won't interrupt scas and cmps instruction since they can interrupt themselves */
count_left=0;
CPU_Cycles-=count;
}
}
add_index=GETFLAG(DF) ? -1 : 1;
@ -141,7 +140,7 @@
{
Bit8u val2;
for (;count>0;) {
count--;
count--;CPU_Cycles--;
val2=LoadMb(di_base+di_index);
di_index=(di_index+add_index) & add_mask;
if ((reg_al==val2)!=inst.repz) break;
@ -153,7 +152,7 @@
{
add_index<<=1;Bit16u val2;
for (;count>0;) {
count--;
count--;CPU_Cycles--;
val2=LoadMw(di_base+di_index);
di_index=(di_index+add_index) & add_mask;
if ((reg_ax==val2)!=inst.repz) break;
@ -165,7 +164,7 @@
{
add_index<<=2;Bit32u val2;
for (;count>0;) {
count--;
count--;CPU_Cycles--;
val2=LoadMd(di_base+di_index);
di_index=(di_index+add_index) & add_mask;
if ((reg_eax==val2)!=inst.repz) break;
@ -177,7 +176,7 @@
{
Bit8u val1,val2;
for (;count>0;) {
count--;
count--;CPU_Cycles--;
val1=LoadMb(si_base+si_index);
val2=LoadMb(di_base+di_index);
si_index=(si_index+add_index) & add_mask;
@ -191,7 +190,7 @@
{
add_index<<=1;Bit16u val1,val2;
for (;count>0;) {
count--;
count--;CPU_Cycles--;
val1=LoadMw(si_base+si_index);
val2=LoadMw(di_base+di_index);
si_index=(si_index+add_index) & add_mask;
@ -205,7 +204,7 @@
{
add_index<<=2;Bit32u val1,val2;
for (;count>0;) {
count--;
count--;CPU_Cycles--;
val1=LoadMd(si_base+si_index);
val2=LoadMd(di_base+di_index);
si_index=(si_index+add_index) & add_mask;