std::string show(Vreg r) {
if (!r.isValid()) return "%?";
std::ostringstream str;
if (r.isPhys()) {
mcg->backEnd().streamPhysReg(str, r);
} else {
str << "%" << size_t(r);
}
return str.str();
}
PhysReg lookup(Vreg vreg, VregKind kind) {
auto ivl = xls.intervals[vreg];
if (!ivl || vreg.isPhys()) return vreg;
PhysReg reg = ivl->childAt(pos)->reg;
assert((kind == VregKind::Gpr && reg.isGP()) ||
(kind == VregKind::Simd && reg.isSIMD()) ||
(kind == VregKind::Any && reg != InvalidReg));
return reg;
}