linux-5.10/lib/ashldi3.c

8c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later
8c2ecf20Sopenharmony_ci/*
8c2ecf20Sopenharmony_ci */
8c2ecf20Sopenharmony_ci
8c2ecf20Sopenharmony_ci#include <linux/export.h>
8c2ecf20Sopenharmony_ci
8c2ecf20Sopenharmony_ci#include <linux/libgcc.h>
8c2ecf20Sopenharmony_ci
8c2ecf20Sopenharmony_cilong long notrace __ashldi3(long long u, word_type b)
8c2ecf20Sopenharmony_ci{
8c2ecf20Sopenharmony_ci	DWunion uu, w;
8c2ecf20Sopenharmony_ci	word_type bm;
8c2ecf20Sopenharmony_ci
8c2ecf20Sopenharmony_ci	if (b == 0)
8c2ecf20Sopenharmony_ci		return u;
8c2ecf20Sopenharmony_ci
8c2ecf20Sopenharmony_ci	uu.ll = u;
8c2ecf20Sopenharmony_ci	bm = 32 - b;
8c2ecf20Sopenharmony_ci
8c2ecf20Sopenharmony_ci	if (bm <= 0) {
8c2ecf20Sopenharmony_ci		w.s.low = 0;
8c2ecf20Sopenharmony_ci		w.s.high = (unsigned int) uu.s.low << -bm;
8c2ecf20Sopenharmony_ci	} else {
8c2ecf20Sopenharmony_ci		const unsigned int carries = (unsigned int) uu.s.low >> bm;
8c2ecf20Sopenharmony_ci
8c2ecf20Sopenharmony_ci		w.s.low = (unsigned int) uu.s.low << b;
8c2ecf20Sopenharmony_ci		w.s.high = ((unsigned int) uu.s.high << b) | carries;
8c2ecf20Sopenharmony_ci	}
8c2ecf20Sopenharmony_ci
8c2ecf20Sopenharmony_ci	return w.ll;
8c2ecf20Sopenharmony_ci}
8c2ecf20Sopenharmony_ciEXPORT_SYMBOL(__ashldi3);