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[FAST486]

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In rotate operations, the count is always masked with 0x1F, regardless
of the operand size.


svn path=/branches/ntvdm/; revision=60966
This commit is contained in:
Aleksandar Andrejevic 2013-11-12 19:25:50 +00:00
parent ac9f8a81e3
commit 2da0e38fbc
2 changed files with 8 additions and 14 deletions
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6
lib/fast486/extraops.c
View file

@ -637,8 +637,7 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShld)
} }
/* Normalize the count */ /* Normalize the count */
if (OperandSize) Count &= 0x1F; Count &= 0x1F;
else Count &= 0x0F;
/* Do nothing if the count is zero */ /* Do nothing if the count is zero */
if (Count == 0) return TRUE; if (Count == 0) return TRUE;
@ -840,8 +839,7 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShrd)
} }
/* Normalize the count */ /* Normalize the count */
if (OperandSize) Count &= 0x1F; Count &= 0x1F;
else Count &= 0x0F;
/* Do nothing if the count is zero */ /* Do nothing if the count is zero */
if (Count == 0) return TRUE; if (Count == 0) return TRUE;

16
lib/fast486/opgroups.c
View file

@ -163,16 +163,11 @@ Fast486RotateOperation(PFAST486_STATE State,
ULONG HighestBit = 1 << (Bits - 1); ULONG HighestBit = 1 << (Bits - 1);
ULONG Result; ULONG Result;
if ((Operation != 2) && (Operation != 3)) /* Normalize the count */
{ Count &= 0x1F;
/* Mask the count */
Count &= Bits - 1; /* If the count is zero, do nothing */
} if (Count == 0) goto SetFlags;
else
{
/* For RCL and RCR, the CF is included in the value */
Count %= Bits + 1;
}
/* Check which operation is this */ /* Check which operation is this */
switch (Operation) switch (Operation)
@ -275,6 +270,7 @@ Fast486RotateOperation(PFAST486_STATE State,
} }
} }
SetFlags:
if (Operation >= 4) if (Operation >= 4)
{ {
/* Update ZF, SF and PF */ /* Update ZF, SF and PF */