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Remove index register restrictions on ix/arith instructions. 

The %ix/<arith> instructions are currently not in use, but even so
it is just plain wrong to restrict their register argument to 0-3.
This commit is contained in:
Stephen Williams 2008-02-27 17:01:53 -08:00
parent ec87c7f6de
commit 75df8fb6bb
2 changed files with 4 additions and 5 deletions
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3
vvp/opcodes.txt
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@ -353,8 +353,7 @@ thread bit vector.
This instruction adds, subtracts, or multiplies an immediate value to
the addressed index register. The index register holds numeric values,
so the <value> is a number. The <idx> value selects the index register,
and may be 0, 1, 2 or 3.
so the <value> is a number. The <idx> value selects the index register.
* %jmp <code-label>

6
vvp/vthread.cc
View File

@ -1840,19 +1840,19 @@ bool of_INV(vthread_t thr, vvp_code_t cp)
bool of_IX_ADD(vthread_t thr, vvp_code_t cp)
{
thr->words[cp->bit_idx[0] & 3].w_int += cp->number;
thr->words[cp->bit_idx[0]].w_int += cp->number;
return true;
}
bool of_IX_SUB(vthread_t thr, vvp_code_t cp)
{
thr->words[cp->bit_idx[0] & 3].w_int -= cp->number;
thr->words[cp->bit_idx[0]].w_int -= cp->number;
return true;
}
bool of_IX_MUL(vthread_t thr, vvp_code_t cp)
{
thr->words[cp->bit_idx[0] & 3].w_int *= cp->number;
thr->words[cp->bit_idx[0]].w_int *= cp->number;
return true;
}