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Added 32-bit BSF and BSR

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1046
This commit is contained in:
Sjoerd van der Berg 2003-06-10 08:50:28 +00:00
parent a3b63b239b
commit 6f9016c8eb
3 changed files with 28 additions and 2 deletions
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26
src/cpu/core_full/op.h
View file

@ -496,6 +496,19 @@ switch (inst.code.op) {
SETFLAGBIT(ZF,false);
}
break;
case O_BSFd:
{
FILLFLAGS;
if (!inst.op1.d) SETFLAGBIT(ZF,true);
Bitu count=0;
while (count<32) {
if ((inst.op1.d>>count) & 1) break;
count++;
}
inst.op1.d=count;
SETFLAGBIT(ZF,false);
}
break;
case O_BSRw:
{
FILLFLAGS;
@ -509,6 +522,19 @@ switch (inst.code.op) {
SETFLAGBIT(ZF,false);
}
break;
case O_BSRd:
{
FILLFLAGS;
if (!inst.op1.d) SETFLAGBIT(ZF,true);
Bits count=31;
while (count>0) {
if ((inst.op1.d>>count) & 1) break;
count--;
}
inst.op1.d=count;
SETFLAGBIT(ZF,false);
}
break;
case O_BTw:
case O_BTSw:
case O_BTCw:

2
src/cpu/core_full/optable.h
View file

@ -668,7 +668,7 @@ static OpCode OpCodeTable[1024]={
/* 0x3b8 - 0x3bf */
{0 ,0 ,0 ,0 },{0 ,0 ,0 ,0 },
{L_MODRM ,0xf ,0 ,M_GRP },{L_MODRM ,O_BTCd ,0 ,0 },
{0 ,0 ,0 ,0 },{0 ,0 ,0 ,0 },
{L_MODRM ,O_BSFd ,S_Gd ,M_Ed },{L_MODRM ,O_BSRd ,S_Gd ,M_Ed },
{L_MODRM ,0 ,S_Gd ,M_Ebx },{L_MODRM ,0 ,S_Gd ,M_Ewx },
/* 0x3c0 - 0x3cc */

2
src/cpu/core_full/support.h
View file

@ -87,7 +87,7 @@ enum {
O_BTw,O_BTSw,O_BTRw,O_BTCw,
O_BTd,O_BTSd,O_BTRd,O_BTCd,
O_BSFw,O_BSRw,
O_BSFw,O_BSRw,O_BSFd,O_BSRd,
O_BSWAP,
O_FPU,