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Change flag handling of rotate instructions

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2028
This commit is contained in:
Sjoerd van der Berg 2004-10-17 15:33:52 +00:00
parent 4e69d3bf7a
commit 7a096a16ea
2 changed files with 134 additions and 236 deletions
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116
src/cpu/flags.cpp
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@ -42,9 +42,6 @@ Bitu get_CF(void) {
case t_DECw:
case t_DECd:
case t_MUL:
case t_RCLb:
case t_RCLw:
case t_RCLd:
return GETFLAG(CF);
break;
case t_ADDb:
@ -107,18 +104,6 @@ Bitu get_CF(void) {
return lf_var1w;
case t_NEGd:
return lf_var1d;
case t_ROLb:
return lf_resb & 1;
case t_ROLw:
return lf_resw & 1;
case t_ROLd:
return lf_resd & 1;
case t_RORb:
return (lf_resb & 0x80);
case t_RORw:
return (lf_resw & 0x8000);
case t_RORd:
return (lf_resd & 0x80000000);
case t_ORb:
case t_ORw:
case t_ORd:
@ -148,18 +133,6 @@ Bitu get_AF(void) {
Bitu type=lflags.type;
switch (type) {
case t_UNKNOWN:
case t_ROLb:
case t_RORb:
case t_RCLb:
case t_RCRb:
case t_ROLw:
case t_RORw:
case t_RCLw:
case t_RCRw:
case t_ROLd:
case t_RORd:
case t_RCLd:
case t_RCRd:
return GETFLAG(AF);
case t_ADDb:
case t_ADCb:
@ -238,18 +211,6 @@ Bitu get_ZF(void) {
Bitu type=lflags.type;
switch (type) {
case t_UNKNOWN:
case t_ROLb:
case t_RORb:
case t_RCLb:
case t_RCRb:
case t_ROLw:
case t_RORw:
case t_RCLw:
case t_RCRw:
case t_ROLd:
case t_RORd:
case t_RCLd:
case t_RCRd:
return GETFLAG(ZF);
case t_ADDb:
case t_ORb:
@ -318,18 +279,6 @@ Bitu get_SF(void) {
Bitu type=lflags.type;
switch (type) {
case t_UNKNOWN:
case t_ROLb:
case t_RORb:
case t_RCLb:
case t_RCRb:
case t_ROLw:
case t_RORw:
case t_RCLw:
case t_RCRw:
case t_ROLd:
case t_RORd:
case t_RCLd:
case t_RCRd:
return GETFLAG(SF);
case t_ADDb:
case t_ORb:
@ -437,26 +386,14 @@ Bitu get_OF(void) {
return (lf_var1w == 0x8000);
case t_NEGd:
return (lf_var1d == 0x80000000);
case t_ROLb:
case t_RORb:
case t_RCLb:
case t_RCRb:
case t_SHLb:
case t_SHRb:
return (lf_resb ^ lf_var1b) & 0x80;
case t_ROLw:
case t_RORw:
case t_RCLw:
case t_RCRw:
case t_SHLw:
case t_SHRw:
case t_DSHRw:
case t_DSHLw:
return (lf_resw ^ lf_var1w) & 0x8000;
case t_ROLd:
case t_RORd:
case t_RCLd:
case t_RCRd:
case t_SHLd:
case t_SHRd:
case t_DSHRd:
@ -507,7 +444,7 @@ Bit16u parity_lookup[256] = {
Bitu get_PF(void) {
switch (lflags.type) {
case t_UNKNOWN:
case t_UNKNOWN:
return GETFLAG(PF);
default:
return (parity_lookup[lf_resb]);;
@ -832,57 +769,6 @@ Bitu FillFlags(void) {
DOFLAG_PF;
break;
case t_ROLb:
SET_FLAG(CF,lf_resb & 1);
SET_FLAG(OF,(lf_resb ^ lf_var1b) & 0x80);
break;
case t_ROLw:
SET_FLAG(CF,lf_resw & 1);
SET_FLAG(OF,(lf_resw ^ lf_var1w) & 0x8000);
break;
case t_ROLd:
SET_FLAG(CF,lf_resd & 1);
SET_FLAG(OF,(lf_resd ^ lf_var1d) & 0x80000000);
break;
case t_RORb:
SET_FLAG(CF,(lf_resb & 0x80));
SET_FLAG(OF,(lf_resb ^ lf_var1b) & 0x80);
break;
case t_RORw:
SET_FLAG(CF,(lf_resw & 0x8000));
SET_FLAG(OF,(lf_resw ^ lf_var1w) & 0x8000);
break;
case t_RORd:
SET_FLAG(CF,(lf_resd & 0x80000000));
SET_FLAG(OF,(lf_resd ^ lf_var1d) & 0x80000000);
break;
case t_RCLb:
SET_FLAG(OF,(lf_resb ^ lf_var1b) & 0x80);
break;
case t_RCLw:
SET_FLAG(OF,(lf_resw ^ lf_var1w) & 0x8000);
break;
case t_RCLd:
SET_FLAG(OF,(lf_resd ^ lf_var1d) & 0x80000000);
break;
case t_RCRb:
SET_FLAG(CF,(lf_var1b >> (lf_var2b - 1)) & 1);
SET_FLAG(OF,(lf_resb ^ lf_var1b) & 0x80);
break;
case t_RCRw:
SET_FLAG(CF,(lf_var1w >> (lf_var2b - 1)) & 1);
SET_FLAG(OF,(lf_resw ^ lf_var1w) & 0x8000);
break;
case t_RCRd:
SET_FLAG(CF,(lf_var1d >> (lf_var2b - 1)) & 1);
SET_FLAG(OF,(lf_resd ^ lf_var1d) & 0x80000000);
break;
case t_INCb:
SET_FLAG(AF,(lf_resb & 0x0f) == 0);
DOFLAG_ZFb;