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compile branches on and using test

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This commit is contained in:
Quentin Carbonneaux 2015-08-16 11:34:52 -04:00
parent ca3dc70ff3
commit 16fe5c1366
4 changed files with 36 additions and 11 deletions
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29
lisc/isel.c
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@ -173,6 +173,10 @@ sel(Ins i, Fn *fn)
break;
case ONop:
break;
case OXTestw:
case OXTestl:
n = 2;
goto Emit;
case OAdd:
case OSub:
case OAnd:
@ -318,15 +322,26 @@ seljmp(Blk *b, Fn *fn)
selcmp(fi->arg, fn);
*fi = (Ins){ONop, R, {R, R}};
}
} else {
if (fn->tmp[r.val].nuse == 1)
emit(OCopy, R, r, R);
b->jmp.type = JXJc + Cne;
return;
}
if (fi->op == OAnd && fn->tmp[r.val].nuse == 1
&& (rtype(fi->arg[0]) == RTmp ||
rtype(fi->arg[1]) == RTmp)) {
if (fn->tmp[r.val].type == TLong)
fi->op = OXTestl;
else
fi->op = OXTestw;
fi->to = R;
b->jmp.type = JXJc + Cne;
return;
}
if (fn->tmp[r.val].nuse > 1) {
b->jmp.type = JXJc + Cne;
return;
}
} else {
selcmp((Ref[2]){r, CON_Z}, fn);
b->jmp.type = JXJc + Cne;
}
selcmp((Ref[2]){r, CON_Z}, fn);
b->jmp.type = JXJc + Cne;
}
int