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Optimize the conventional move operation.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3720 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2007-11-22 15:10:21 +00:00
parent e7c240035f
commit 185f07621f
1 changed files with 6 additions and 0 deletions
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6
target-mips/translate.c
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@ -1240,6 +1240,12 @@ static void gen_arith (CPUState *env, DisasContext *ctx, uint32_t opc,
return;
}
GEN_LOAD_REG_TN(T0, rs);
/* Specialcase the conventional move operation. */
if (rt == 0 && (opc == OPC_ADDU || opc == OPC_DADDU
|| opc == OPC_SUBU || opc == OPC_DSUBU)) {
GEN_STORE_TN_REG(rd, T0);
return;
}
GEN_LOAD_REG_TN(T1, rt);
switch (opc) {
case OPC_ADD: