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handle b == t case in multiplyR and remainderR

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This commit is contained in:
Joel Dice 2009-03-14 14:14:49 -06:00
parent ee2d105f6c
commit 54b691f4de
1 changed files with 34 additions and 8 deletions
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42
src/powerpc.cpp
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@ -737,12 +737,28 @@ void subC(Context* c, unsigned size, Const* a, Reg* b, Reg* t) {
void multiplyR(Context* con, unsigned size, Reg* a, Reg* b, Reg* t) { void multiplyR(Context* con, unsigned size, Reg* a, Reg* b, Reg* t) {
if(size == 8) { if(size == 8) {
issue(con, mullw(H(t), H(a), R(b))); bool useTemporaries = b->low == t->low;
issue(con, mullw(R(t), R(a), H(b))); int tmpLow;
issue(con, add(H(t), H(t), R(t))); int tmpHigh;
issue(con, mulhwu(R(t), R(a), R(b))); if (useTemporaries) {
issue(con, add(H(t), H(t), R(t))); tmpLow = con->client->acquireTemporary();
tmpHigh = con->client->acquireTemporary();
} else {
tmpLow = t->low;
tmpHigh = t->high;
}
issue(con, mullw(tmpHigh, H(a), R(b)));
issue(con, mullw(tmpLow, R(a), H(b)));
issue(con, add(H(t), tmpHigh, tmpLow));
issue(con, mulhwu(tmpLow, R(a), R(b)));
issue(con, add(H(t), H(t), tmpLow));
issue(con, mullw(R(t), R(a), R(b))); issue(con, mullw(R(t), R(a), R(b)));
if (useTemporaries) {
con->client->releaseTemporary(tmpLow);
con->client->releaseTemporary(tmpHigh);
}
} else { } else {
issue(con, mullw(R(t), R(a), R(b))); issue(con, mullw(R(t), R(a), R(b)));
} }
@ -754,9 +770,19 @@ void divideR(Context* con, unsigned size UNUSED, Reg* a, Reg* b, Reg* t) {
} }
void remainderR(Context* con, unsigned size, Reg* a, Reg* b, Reg* t) { void remainderR(Context* con, unsigned size, Reg* a, Reg* b, Reg* t) {
divideR(con, size, a, b, t); bool useTemporary = b->low == t->low;
multiplyR(con, size, a, t, t); Assembler::Register tmp(t->low);
subR(con, size, t, b, t); if (useTemporary) {
tmp.low = con->client->acquireTemporary();
}
divideR(con, size, a, b, &tmp);
multiplyR(con, size, a, &tmp, &tmp);
subR(con, size, &tmp, b, t);
if (useTemporary) {
con->client->releaseTemporary(tmp.low);
}
} }
int int