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/*
* Scalar emulation of SIMD 32-bit operations
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_SIMD_SCALAR_H__
#define BOTAN_SIMD_SCALAR_H__
#include <botan/loadstor.h>
#include <botan/bswap.h>
namespace Botan {
/**
* Fake SIMD, using plain scalar operations
* Often still faster than iterative on superscalar machines
*/
class SIMD_Scalar
{
public:
static bool enabled() { return true; }
SIMD_Scalar(const u32bit B[4])
{
R0 = B[0];
R1 = B[1];
R2 = B[2];
R3 = B[3];
}
SIMD_Scalar(u32bit B0, u32bit B1, u32bit B2, u32bit B3)
{
R0 = B0;
R1 = B1;
R2 = B2;
R3 = B3;
}
SIMD_Scalar(u32bit B)
{
R0 = B;
R1 = B;
R2 = B;
R3 = B;
}
static SIMD_Scalar load_le(const void* in)
{
const byte* in_b = static_cast<const byte*>(in);
return SIMD_Scalar(Botan::load_le<u32bit>(in_b, 0),
Botan::load_le<u32bit>(in_b, 1),
Botan::load_le<u32bit>(in_b, 2),
Botan::load_le<u32bit>(in_b, 3));
}
static SIMD_Scalar load_be(const void* in)
{
const byte* in_b = static_cast<const byte*>(in);
return SIMD_Scalar(Botan::load_be<u32bit>(in_b, 0),
Botan::load_be<u32bit>(in_b, 1),
Botan::load_be<u32bit>(in_b, 2),
Botan::load_be<u32bit>(in_b, 3));
}
void store_le(byte out[]) const
{
Botan::store_le(out, R0, R1, R2, R3);
}
void store_be(byte out[]) const
{
Botan::store_be(out, R0, R1, R2, R3);
}
void rotate_left(size_t rot)
{
R0 = Botan::rotate_left(R0, rot);
R1 = Botan::rotate_left(R1, rot);
R2 = Botan::rotate_left(R2, rot);
R3 = Botan::rotate_left(R3, rot);
}
void rotate_right(size_t rot)
{
R0 = Botan::rotate_right(R0, rot);
R1 = Botan::rotate_right(R1, rot);
R2 = Botan::rotate_right(R2, rot);
R3 = Botan::rotate_right(R3, rot);
}
void operator+=(const SIMD_Scalar& other)
{
R0 += other.R0;
R1 += other.R1;
R2 += other.R2;
R3 += other.R3;
}
SIMD_Scalar operator+(const SIMD_Scalar& other) const
{
return SIMD_Scalar(R0 + other.R0,
R1 + other.R1,
R2 + other.R2,
R3 + other.R3);
}
void operator-=(const SIMD_Scalar& other)
{
R0 -= other.R0;
R1 -= other.R1;
R2 -= other.R2;
R3 -= other.R3;
}
SIMD_Scalar operator-(const SIMD_Scalar& other) const
{
return SIMD_Scalar(R0 - other.R0,
R1 - other.R1,
R2 - other.R2,
R3 - other.R3);
}
void operator^=(const SIMD_Scalar& other)
{
R0 ^= other.R0;
R1 ^= other.R1;
R2 ^= other.R2;
R3 ^= other.R3;
}
SIMD_Scalar operator^(const SIMD_Scalar& other) const
{
return SIMD_Scalar(R0 ^ other.R0,
R1 ^ other.R1,
R2 ^ other.R2,
R3 ^ other.R3);
}
void operator|=(const SIMD_Scalar& other)
{
R0 |= other.R0;
R1 |= other.R1;
R2 |= other.R2;
R3 |= other.R3;
}
SIMD_Scalar operator&(const SIMD_Scalar& other)
{
return SIMD_Scalar(R0 & other.R0,
R1 & other.R1,
R2 & other.R2,
R3 & other.R3);
}
void operator&=(const SIMD_Scalar& other)
{
R0 &= other.R0;
R1 &= other.R1;
R2 &= other.R2;
R3 &= other.R3;
}
SIMD_Scalar operator<<(size_t shift) const
{
return SIMD_Scalar(R0 << shift,
R1 << shift,
R2 << shift,
R3 << shift);
}
SIMD_Scalar operator>>(size_t shift) const
{
return SIMD_Scalar(R0 >> shift,
R1 >> shift,
R2 >> shift,
R3 >> shift);
}
SIMD_Scalar operator~() const
{
return SIMD_Scalar(~R0, ~R1, ~R2, ~R3);
}
// (~reg) & other
SIMD_Scalar andc(const SIMD_Scalar& other)
{
return SIMD_Scalar(~R0 & other.R0,
~R1 & other.R1,
~R2 & other.R2,
~R3 & other.R3);
}
SIMD_Scalar bswap() const
{
return SIMD_Scalar(reverse_bytes(R0),
reverse_bytes(R1),
reverse_bytes(R2),
reverse_bytes(R3));
}
static void transpose(SIMD_Scalar& B0, SIMD_Scalar& B1,
SIMD_Scalar& B2, SIMD_Scalar& B3)
{
SIMD_Scalar T0(B0.R0, B1.R0, B2.R0, B3.R0);
SIMD_Scalar T1(B0.R1, B1.R1, B2.R1, B3.R1);
SIMD_Scalar T2(B0.R2, B1.R2, B2.R2, B3.R2);
SIMD_Scalar T3(B0.R3, B1.R3, B2.R3, B3.R3);
B0 = T0;
B1 = T1;
B2 = T2;
B3 = T3;
}
private:
u32bit R0, R1, R2, R3;
};
}
#endif
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