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Date: Wed, 23 May 2012 23:42:42 +0200 From: Juri Lelli <juri.lelli@...il.com> To: peterz@...radead.org, tglx@...utronix.de Cc: mingo@...hat.com, rostedt@...dmis.org, oleg@...hat.com, fweisbec@...il.com, darren@...art.com, johan.eker@...csson.com, p.faure@...tech.ch, linux-kernel@...r.kernel.org, claudio@...dence.eu.com, michael@...rulasolutions.com, fchecconi@...il.com, tommaso.cucinotta@...up.it, juri.lelli@...il.com, nicola.manica@...i.unitn.it, luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com, paulmck@...ux.vnet.ibm.com, raistlin@...ux.it, insop.song@...csson.com, liming.wang@...driver.com, jkacur@...hat.com, harald.gustafsson@...csson.com Subject: [PATCH 02/15] math128, x86_64: Implement {mul,add}_u128 in 64bit asm From: Peter Zijlstra <a.p.zijlstra@...llo.nl> Enable __int128 usage when available, if not, provide asm versions of mul_u64_u64 and add_u128. Cc: Ingo Molnar <mingo@...nel.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: H. Peter Anvin <hpa@...or.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl> Link: http://lkml.kernel.org/n/tip-67zk6v8agsi8m7k1bdcd0srw@git.kernel.org --- arch/x86/include/asm/Kbuild | 1 - arch/x86/include/asm/math128.h | 39 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+), 1 deletion(-) create mode 100644 arch/x86/include/asm/math128.h diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild index 86441b9..f9c0d3b 100644 --- a/arch/x86/include/asm/Kbuild +++ b/arch/x86/include/asm/Kbuild @@ -26,4 +26,3 @@ header-y += vsyscall.h genhdr-y += unistd_32.h genhdr-y += unistd_64.h genhdr-y += unistd_x32.h -generic-y += math128.h diff --git a/arch/x86/include/asm/math128.h b/arch/x86/include/asm/math128.h new file mode 100644 index 0000000..c0e2a6c --- /dev/null +++ b/arch/x86/include/asm/math128.h @@ -0,0 +1,39 @@ +#ifndef _ASM_MATH128_H +#define _ASM_MATH128_H + +#ifdef CONFIG_X86_64 + +#ifdef __SIZEOF_INT128__ +#define ARCH_HAS_INT128 +#endif + +#ifndef ARCH_HAS_INT128 + +static inline u128 mul_u64_u64(u64 a, u64 b) +{ + u128 res; + + asm("mulq %2" + : "=a" (res.lo), "=d" (res.hi) + : "rm" (b), "0" (a)); + + return res; +} +#define mul_u64_u64 mul_u64_u64 + +static inline u128 add_u128(u128 a, u128 b) +{ + u128 res; + + asm("addq %2,%0;\n" + "adcq %3,%1;\n" + : "=rm" (res.lo), "=rm" (res.hi) + : "r" (b.lo), "r" (b.hi), "0" (a.lo), "1" (a.hi)); + + return res; +} +#define add_u128 add_u128 + +#endif /* ARCH_HAS_INT128 */ +#endif /* CONFIG_X86_64 */ +#endif /* _ASM_MATH128_H */ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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