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/*************************************************
* Lowest Level MPI Algorithms Header File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#ifndef BOTAN_MP_ASM_INTERNAL_H__
#define BOTAN_MP_ASM_INTERNAL_H__
#include <botan/mp_types.h>
namespace Botan {
/*************************************************
* Helper Macros for x86 Assembly *
*************************************************/
#define ASM(x) x "\n\t"
#define ADDSUB2_OP(OPERATION, INDEX) \
ASM("movl 4*" INDEX "(%[y]), %[carry]") \
ASM(OPERATION " %[carry], 4*" INDEX "(%[x])") \
#define ADDSUB3_OP(OPERATION, INDEX) \
ASM("movl 4*" INDEX "(%[x]), %[carry]") \
ASM(OPERATION " 4*" INDEX "(%[y]), %[carry]") \
ASM("movl %[carry], 4*" INDEX "(%[z])") \
#define LINMUL_OP(WRITE_TO, INDEX) \
ASM("movl 4*" INDEX "(%[x]),%%eax") \
ASM("mull %[y]") \
ASM("addl %[carry],%%eax") \
ASM("adcl $0,%%edx") \
ASM("movl %%edx,%[carry]") \
ASM("movl %%eax, 4*" INDEX "(%[" WRITE_TO "])")
#define MULADD_OP(IGNORED, INDEX) \
ASM("movl 4*" INDEX "(%[x]),%%eax") \
ASM("mull %[y]") \
ASM("addl %[carry],%%eax") \
ASM("adcl $0,%%edx") \
ASM("addl 4*" INDEX "(%[z]),%%eax") \
ASM("adcl $0,%%edx") \
ASM("movl %%edx,%[carry]") \
ASM("movl %%eax, 4*" INDEX " (%[z])")
#define DO_8_TIMES(MACRO, ARG) \
MACRO(ARG, "0") MACRO(ARG, "1") MACRO(ARG, "2") MACRO(ARG, "3") \
MACRO(ARG, "4") MACRO(ARG, "5") MACRO(ARG, "6") MACRO(ARG, "7")
#define ADD_OR_SUBTRACT(CORE_CODE) \
ASM("rorl %[carry]") \
CORE_CODE \
ASM("sbbl %[carry],%[carry]") \
ASM("negl %[carry]")
/*************************************************
* Word Addition *
*************************************************/
inline word word_add(word x, word y, word* carry)
{
asm(
ADD_OR_SUBTRACT(ASM("adcl %[y],%[x]"))
: [x]"=r"(x), [carry]"=r"(*carry)
: "0"(x), [y]"rm"(y), "1"(*carry)
: "cc");
return x;
}
/*************************************************
* Eight Word Block Addition, Two Argument *
*************************************************/
inline word word8_add2(word x[8], const word y[8], word carry)
{
asm(
ADD_OR_SUBTRACT(DO_8_TIMES(ADDSUB2_OP, "adcl"))
: [carry]"=r"(carry)
: [x]"r"(x), [y]"r"(y), "0"(carry)
: "cc", "memory");
return carry;
}
/*************************************************
* Eight Word Block Addition, Three Argument *
*************************************************/
inline word word8_add3(word z[8], const word x[8], const word y[8], word carry)
{
asm(
ADD_OR_SUBTRACT(DO_8_TIMES(ADDSUB3_OP, "adcl"))
: [carry]"=r"(carry)
: [x]"r"(x), [y]"r"(y), [z]"r"(z), "0"(carry)
: "cc", "memory");
return carry;
}
/*************************************************
* Word Subtraction *
*************************************************/
inline word word_sub(word x, word y, word* carry)
{
asm(
ADD_OR_SUBTRACT(ASM("sbbl %[y],%[x]"))
: [x]"=r"(x), [carry]"=r"(*carry)
: "0"(x), [y]"rm"(y), "1"(*carry)
: "cc");
return x;
}
/*************************************************
* Eight Word Block Subtraction, Two Argument *
*************************************************/
inline word word8_sub2(word x[8], const word y[8], word carry)
{
asm(
ADD_OR_SUBTRACT(DO_8_TIMES(ADDSUB2_OP, "sbbl"))
: [carry]"=r"(carry)
: [x]"r"(x), [y]"r"(y), "0"(carry)
: "cc", "memory");
return carry;
}
/*************************************************
* Eight Word Block Subtraction, Three Argument *
*************************************************/
inline word word8_sub3(word z[8], const word x[8], const word y[8], word carry)
{
asm(
ADD_OR_SUBTRACT(DO_8_TIMES(ADDSUB3_OP, "sbbl"))
: [carry]"=r"(carry)
: [x]"r"(x), [y]"r"(y), [z]"r"(z), "0"(carry)
: "cc", "memory");
return carry;
}
/*************************************************
* Eight Word Block Linear Multiplication *
*************************************************/
inline word word8_linmul2(word x[8], word y, word carry)
{
asm(
DO_8_TIMES(LINMUL_OP, "x")
: [carry]"=r"(carry)
: [x]"r"(x), [y]"rm"(y), "0"(carry)
: "cc", "%eax", "%edx");
return carry;
}
/*************************************************
* Eight Word Block Linear Multiplication *
*************************************************/
inline word word8_linmul3(word z[8], const word x[8], word y, word carry)
{
asm(
DO_8_TIMES(LINMUL_OP, "z")
: [carry]"=r"(carry)
: [z]"r"(z), [x]"r"(x), [y]"rm"(y), "0"(carry)
: "cc", "%eax", "%edx");
return carry;
}
/*************************************************
* Eight Word Block Multiply/Add *
*************************************************/
inline word word8_madd3(word z[8], const word x[8], word y, word carry)
{
asm(
DO_8_TIMES(MULADD_OP, "")
: [carry]"=r"(carry)
: [z]"r"(z), [x]"r"(x), [y]"rm"(y), "0"(carry)
: "cc", "%eax", "%edx");
return carry;
}
}
#endif
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