} else {
		maxstacksize = 250000000
	}

	// An upper limit for max stack size. Used to avoid random crashes
	// after calling SetMaxStack and trying to allocate a stack that is too big,
	// since stackalloc works with 32-bit sizes.
	maxstackceiling = 2 * maxstacksize

	// Allow newproc to start new Ms.
	mainStarted = true

	if haveSysmon {
		systemstack(func() {
			newm(sysmon, nil, -1)
		})
	}

	bh := (*buckhashArray)(buckhash.Load())
	if bh == nil {
		lock(&profInsertLock)
		// check again under the lock
		bh = (*buckhashArray)(buckhash.Load())
		if bh == nil {
			bh = (*buckhashArray)(sysAlloc(unsafe.Sizeof(buckhashArray{}), &memstats.buckhash_sys))
			if bh == nil {
				throw("runtime: cannot allocate memory")
			}
			buckhash.StoreNoWB(unsafe.Pointer(bh))
		}
		unlock(&profInsertLock)
	}

		default:
			s.Fatalf("bad unsigned index extension %s", idx.Type)
		}
	}
	return s.newValue1(op, types.Types[types.TINT], idx)
}

// CheckLoweredPhi checks that regalloc and stackalloc correctly handled phi values.
// Called during ssaGenValue.
func CheckLoweredPhi(v *ssa.Value) {
	if v.Op != ssa.OpPhi {
		v.Fatalf("CheckLoweredPhi called with non-phi value: %v", v.LongString())
	}