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Minor improvements to the %split/vec4 instruction.

This commit is contained in:
Stephen Williams 2014-11-21 16:51:59 -08:00
parent 663c79d4af
commit c222b3b6a4
1 changed files with 6 additions and 3 deletions
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9
vvp/vthread.cc
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@ -5065,18 +5065,21 @@ bool of_SHIFTR_S(vthread_t thr, vvp_code_t cp)
/*
* %split/vec4 <wid>
* Pop 1 value,
* Take <wid> bits from the lsb,
* Push the remaining msb,
* Push the lsb.
*/
bool of_SPLIT_VEC4(vthread_t thr, vvp_code_t cp)
{
unsigned lsb_wid = cp->number;
vvp_vector4_t val = thr->pop_vec4();
vvp_vector4_t&val = thr->peek_vec4();
assert(lsb_wid < val.size());
vvp_vector4_t lsb = val.subvalue(0, lsb_wid);
vvp_vector4_t msb = val.subvalue(lsb_wid, val.size()-lsb_wid);
val = val.subvalue(lsb_wid, val.size()-lsb_wid);
thr->push_vec4(msb);
thr->push_vec4(lsb);
return true;
}