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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _ALPHA_SWAB_H #define _ALPHA_SWAB_H #include #include #include #ifdef __GNUC__ static inline __attribute_const__ __u32 __arch_swab32(__u32 x) { /* * Unfortunately, we can't use the 6 instruction sequence * on ev6 since the latency of the UNPKBW is 3, which is * pretty hard to hide. Just in case a future implementation * has a lower latency, here's the sequence (also by Mike Burrows) * * UNPKBW a0, v0 v0: 00AA00BB00CC00DD * SLL v0, 24, a0 a0: BB00CC00DD000000 * BIS v0, a0, a0 a0: BBAACCBBDDCC00DD * EXTWL a0, 6, v0 v0: 000000000000BBAA * ZAP a0, 0xf3, a0 a0: 00000000DDCC0000 * ADDL a0, v0, v0 v0: ssssssssDDCCBBAA */ __u64 t0, t1, t2, t3; t0 = __kernel_inslh(x, 7); /* t0 : 0000000000AABBCC */ t1 = __kernel_inswl(x, 3); /* t1 : 000000CCDD000000