On 10/24/2012 03:27 PM, H. Peter Anvin wrote:
On 10/24/2012 02:53 PM, Juri Lelli wrote: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 +How could this work since u128 presumably has not yet been defined as a structure? After all, isn't it the absence of ARCH_HAS_INT128 which makes that happen?
Sorry, you were not in the Cc list of the previous patch in the patchset, so you probably missed that. I should have triple checked git send-email Cc list. Sorry about that. I'll add you there. Thanks and Regards, - Juri -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
