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/*
* Lowest Level MPI Algorithms
* (C) 1999-2007 Jack Lloyd
* 2006 Luca Piccarreta
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_MP_ASM_INTERNAL_H__
#define BOTAN_MP_ASM_INTERNAL_H__
#include <botan/mp_asm.h>
namespace Botan {
extern "C" {
/*
* Helper Macros for amd64 Assembly
*/
#ifndef ASM
#define ASM(x) x "\n\t"
#endif
#define ADDSUB2_OP(OPERATION, INDEX) \
ASM("movq 8*" #INDEX "(%[y]), %[carry]") \
ASM(OPERATION " %[carry], 8*" #INDEX "(%[x])") \
#define ADDSUB3_OP(OPERATION, INDEX) \
ASM("movq 8*" #INDEX "(%[x]), %[carry]") \
ASM(OPERATION " 8*" #INDEX "(%[y]), %[carry]") \
ASM("movq %[carry], 8*" #INDEX "(%[z])") \
#define LINMUL_OP(WRITE_TO, INDEX) \
ASM("movq 8*" #INDEX "(%[x]),%%rax") \
ASM("mulq %[y]") \
ASM("addq %[carry],%%rax") \
ASM("adcq $0,%%rdx") \
ASM("movq %%rdx,%[carry]") \
ASM("movq %%rax, 8*" #INDEX "(%[" WRITE_TO "])")
#define MULADD_OP(IGNORED, INDEX) \
ASM("movq 8*" #INDEX "(%[x]),%%rax") \
ASM("mulq %[y]") \
ASM("addq %[carry],%%rax") \
ASM("adcq $0,%%rdx") \
ASM("addq 8*" #INDEX "(%[z]),%%rax") \
ASM("adcq $0,%%rdx") \
ASM("movq %%rdx,%[carry]") \
ASM("movq %%rax, 8*" #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("rorq %[carry]") \
CORE_CODE \
ASM("sbbq %[carry],%[carry]") \
ASM("negq %[carry]")
/*
* Word Addition
*/
inline word word_add(word x, word y, word* carry)
{
#if 0
asm(
ADD_OR_SUBTRACT(ASM("adcq %[y],%[x]"))
: [x]"=r"(x), [carry]"=r"(*carry)
: "0"(x), [y]"rm"(y), "1"(*carry)
: "cc");
return x;
#else
word z = x + y;
word c1 = (z < x);
z += *carry;
*carry = c1 | (z < *carry);
return z;
#endif
}
/*
* 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, "adcq"))
: [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, "adcq"))
: [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("sbbq %[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, "sbbq"))
: [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, "sbbq"))
: [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", "%rax", "%rdx");
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", "%rax", "%rdx");
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", "%rax", "%rdx");
return carry;
}
/*
* Multiply-Add Accumulator
*/
inline void word3_muladd(word* w2, word* w1, word* w0, word x, word y)
{
asm(
ASM("mulq %[y]")
ASM("addq %[x],%[w0]")
ASM("adcq %[y],%[w1]")
ASM("adcq $0,%[w2]")
: [w0]"=r"(*w0), [w1]"=r"(*w1), [w2]"=r"(*w2)
: [x]"a"(x), [y]"d"(y), "0"(*w0), "1"(*w1), "2"(*w2)
: "cc");
}
/*
* Multiply-Add Accumulator
*/
inline void word3_muladd_2(word* w2, word* w1, word* w0, word x, word y)
{
asm(
ASM("mulq %[y]")
ASM("addq %[x],%[w0]")
ASM("adcq %[y],%[w1]")
ASM("adcq $0,%[w2]")
ASM("addq %[x],%[w0]")
ASM("adcq %[y],%[w1]")
ASM("adcq $0,%[w2]")
: [w0]"=r"(*w0), [w1]"=r"(*w1), [w2]"=r"(*w2)
: [x]"a"(x), [y]"d"(y), "0"(*w0), "1"(*w1), "2"(*w2)
: "cc");
}
#undef ASM
#undef DO_8_TIMES
#undef ADD_OR_SUBTRACT
#undef ADDSUB2_OP
#undef ADDSUB3_OP
#undef LINMUL_OP
#undef MULADD_OP
}
}
#endif
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