amxtf32intrin.h

Go to the documentation of this file.

/*===------------- amxtf32intrin.h - AMX_TF32 intrinsics -*- C++ -*---------===
 *
 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 * See https://llvm.org/LICENSE.txt for license information.
 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 *
 *===------------------------------------------------------------------------===
 */
 
#ifndef __IMMINTRIN_H
#error "Never use <amxtf32intrin.h> directly; include <immintrin.h> instead."
#endif // __IMMINTRIN_H
 
#ifndef __AMX_TF32INTRIN_H
#define __AMX_TF32INTRIN_H
#ifdef __x86_64__
 
#define __DEFAULT_FN_ATTRS_TF32                                                \
  __attribute__((__always_inline__, __nodebug__, __target__("amx-tf32")))
 
/// Do Matrix Multiplication of \a a and \a b, and then do Matrix Plus
/// with \a srcdst.
/// All the calculation is base on float32 but with the lower 13-bit set to 0.
///
/// \headerfile <immintrin.h>
///
/// \code
/// void _tile_mmultf32ps(constexpr int srcdst, constexpr int a, \
///                       constexpr int b);
/// \endcode
///
/// This intrinsic corresponds to the <c> TMMULTF32PS </c> instruction.
///
/// \param srcdst
///   The destination tile. Max size is 1024 Bytes.
/// \param a
///   The 1st source tile. Max size is 1024 Bytes.
/// \param b
///   The 2nd source tile. Max size is 1024 Bytes.
///
/// \code{.operation}
/// DEFINE zero_lower_mantissa_bits_fp32(x[31:0]) {
/// dword[12:0] := 0
/// dword[31:13] := x[31:13]
/// return dword
/// }
///
/// DEFINE silence_snan_fp32(x[31:0]) {
///   IF (x.exponent == 255 and x.fraction != 0 and x.fraction[22] == 0)
///     x.fraction[22] := 1
///   return x
/// }
///
/// elements_a := a.colsb / 4
/// elements_dest := srcdst.colsb / 4
///
/// FOR m = 0 TO (srcdst.rows-1)
///   tmp[511:0] := 0
///   FOR k = 0 TO (elements_a-1)
///     FOR n = 0 TO (elements_dest-1)
///       af := silence_snan_fp32(a.row[m].fp32[k])
///       bf := silence_snan_fp32(b.row[k].fp32[n])
///       tmp.fp32[n] += zero_lower_mantissa_bits_fp32(af)
///           * zero_lower_mantissa_bits_fp32(bf)
///     ENDFOR
///   ENDFOR
///
///   FOR n = 0 TO (elements_dest-1)
///     tmp.fp32[n] += srcdst.row[m].fp32[n]
///   ENDFOR
/// write_row_and_zero(srcdst, m, tmp, srcdst.colsb)
///
/// ENDFOR
///
/// zero_upper_rows(srcdst, srcdst.rows)
/// zero_tileconfig_start()
/// \endcode
#define _tile_mmultf32ps(srcdst, a, b)                                         \
  __builtin_ia32_tmmultf32ps((srcdst), (a), (b))
 
static __inline__ _tile1024i __DEFAULT_FN_ATTRS_TF32
_tile_mmultf32ps_internal(unsigned short m, unsigned short n, unsigned short k,
                          _tile1024i dst, _tile1024i src1, _tile1024i src2) {
  return __builtin_ia32_tmmultf32ps_internal(m, n, k, dst, src1, src2);
}
 
/// Do Matrix Multiplication of src0 and src1, and then do Matrix Plus with dst.
/// All the calculation is base on float32 but with the lower 13-bit set to 0.
///
/// \headerfile <immintrin.h>
///
/// This intrinsic corresponds to the <c> TMMULTF32PS </c> instruction.
///
/// \param dst
///    The destination tile. Max size is 1024 Bytes.
/// \param src0
///    The 1st source tile. Max size is 1024 Bytes.
/// \param src1
///    The 2nd source tile. Max size is 1024 Bytes.
__DEFAULT_FN_ATTRS_TF32
static void __tile_mmultf32ps(__tile1024i *dst, __tile1024i src0,
                              __tile1024i src1) {
  dst->tile = _tile_mmultf32ps_internal(src0.row, src1.col, src0.col, dst->tile,
                                        src0.tile, src1.tile);
}
 
#endif // __x86_64__
#endif // __AMX_TF32INTRIN_H