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Diffstat (limited to 'arch/mn10300/include/asm/div64.h')
| -rw-r--r-- | arch/mn10300/include/asm/div64.h | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/arch/mn10300/include/asm/div64.h b/arch/mn10300/include/asm/div64.h deleted file mode 100644 index 503efab2a516..000000000000 --- a/arch/mn10300/include/asm/div64.h +++ /dev/null @@ -1,115 +0,0 @@ -/* MN10300 64-bit division - * - * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public Licence - * as published by the Free Software Foundation; either version - * 2 of the Licence, or (at your option) any later version. - */ -#ifndef _ASM_DIV64 -#define _ASM_DIV64 - -#include <linux/types.h> - -extern void ____unhandled_size_in_do_div___(void); - -/* - * Beginning with gcc 4.6, the MDR register is represented explicitly. We - * must, therefore, at least explicitly clobber the register when we make - * changes to it. The following assembly fragments *could* be rearranged in - * order to leave the moves to/from the MDR register to the compiler, but the - * gains would be minimal at best. - */ -#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) -# define CLOBBER_MDR_CC "mdr", "cc" -#else -# define CLOBBER_MDR_CC "cc" -#endif - -/* - * divide n by base, leaving the result in n and returning the remainder - * - we can do this quite efficiently on the MN10300 by cascading the divides - * through the MDR register - */ -#define do_div(n, base) \ -({ \ - unsigned __rem = 0; \ - if (sizeof(n) <= 4) { \ - asm("mov %1,mdr \n" \ - "divu %2,%0 \n" \ - "mov mdr,%1 \n" \ - : "+r"(n), "=d"(__rem) \ - : "r"(base), "1"(__rem) \ - : CLOBBER_MDR_CC \ - ); \ - } else if (sizeof(n) <= 8) { \ - union { \ - unsigned long long l; \ - u32 w[2]; \ - } __quot; \ - __quot.l = n; \ - asm("mov %0,mdr \n" /* MDR = 0 */ \ - "divu %3,%1 \n" \ - /* __quot.MSL = __div.MSL / base, */ \ - /* MDR = MDR:__div.MSL % base */ \ - "divu %3,%2 \n" \ - /* __quot.LSL = MDR:__div.LSL / base, */ \ - /* MDR = MDR:__div.LSL % base */ \ - "mov mdr,%0 \n" \ - : "=d"(__rem), "=r"(__quot.w[1]), "=r"(__quot.w[0]) \ - : "r"(base), "0"(__rem), "1"(__quot.w[1]), \ - "2"(__quot.w[0]) \ - : CLOBBER_MDR_CC \ - ); \ - n = __quot.l; \ - } else { \ - ____unhandled_size_in_do_div___(); \ - } \ - __rem; \ -}) - -/* - * do an unsigned 32-bit multiply and divide with intermediate 64-bit product - * so as not to lose accuracy - * - we use the MDR register to hold the MSW of the product - */ -static inline __attribute__((const)) -unsigned __muldiv64u(unsigned val, unsigned mult, unsigned div) -{ - unsigned result; - - asm("mulu %2,%0 \n" /* MDR:val = val*mult */ - "divu %3,%0 \n" /* val = MDR:val/div; - * MDR = MDR:val%div */ - : "=r"(result) - : "0"(val), "ir"(mult), "r"(div) - : CLOBBER_MDR_CC - ); - - return result; -} - -/* - * do a signed 32-bit multiply and divide with intermediate 64-bit product so - * as not to lose accuracy - * - we use the MDR register to hold the MSW of the product - */ -static inline __attribute__((const)) -signed __muldiv64s(signed val, signed mult, signed div) -{ - signed result; - - asm("mul %2,%0 \n" /* MDR:val = val*mult */ - "div %3,%0 \n" /* val = MDR:val/div; - * MDR = MDR:val%div */ - : "=r"(result) - : "0"(val), "ir"(mult), "r"(div) - : CLOBBER_MDR_CC - ); - - return result; -} - -#endif /* _ASM_DIV64 */ |