libitm/config/x86/x86_avx.cc

   1 /* Copyright (C) 2009-2020 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU Transactional Memory Library (libitm).
   5
   6    Libitm is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14    more details.
  15
  16    Under Section 7 of GPL version 3, you are granted additional
  17    permissions described in the GCC Runtime Library Exception, version
  18    3.1, as published by the Free Software Foundation.
  19
  20    You should have received a copy of the GNU General Public License and
  21    a copy of the GCC Runtime Library Exception along with this program;
  22    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23    <http://www.gnu.org/licenses/>.  */
  24
  25 #include "config.h"
  26
  27 #include "libitm_i.h"
  28 #include "dispatch.h"
  29
  30 extern "C" {
  31
  32 #ifndef HAVE_AS_AVX
  33 // If we don't have an AVX capable assembler, we didn't set -mavx on the
  34 // command-line either, which means that libitm.h defined neither this type
  35 // nor the functions in this file.  Define the type and unconditionally
  36 // wrap the file in extern "C" to make up for the lack of pre-declaration.
  37 typedef float _ITM_TYPE_M256 __attribute__((vector_size(32), may_alias));
  38 #endif
  39
  40 // Re-define the memcpy implementations so that we can frob the
  41 // interface to deal with possibly missing AVX instruction set support.
  42
  43 #ifdef HAVE_AS_AVX
  44 #define RETURN(X)       return X
  45 #define STORE(X,Y)      X = Y
  46 #define OUTPUT(T)       _ITM_TYPE_##T
  47 #define INPUT(T,X)      , _ITM_TYPE_##T X
  48 #else
  49 /* Emit vmovaps (%rax),%ymm0.  */
  50 #define RETURN(X) \
  51   asm volatile(".byte 0xc5,0xfc,0x28,0x00" : "=m"(X) : "a"(&X))
  52 /* Emit vmovaps %ymm0,(%rax); vzeroupper.  */
  53 #define STORE(X,Y) \
  54   asm volatile(".byte 0xc5,0xfc,0x29,0x00,0xc5,0xf8,0x77" : "=m"(X) : "a"(&X))
  55 #define OUTPUT(T)       void
  56 #define INPUT(T,X)
  57 #endif
  58
  59 #undef ITM_READ_MEMCPY
  60 #define ITM_READ_MEMCPY(T, LSMOD, TARGET, M2)                           \
  61 OUTPUT(T) ITM_REGPARM _ITM_##LSMOD##T (const _ITM_TYPE_##T *ptr)        \
  62 {                                                                       \
  63   _ITM_TYPE_##T v;                                                      \
  64   TARGET memtransfer##M2(&v, ptr, sizeof(_ITM_TYPE_##T), false,         \
  65                          GTM::abi_dispatch::NONTXNAL,                   \
  66                          GTM::abi_dispatch::LSMOD);                     \
  67   RETURN(v);                                                            \
  68 }
  69
  70 #undef ITM_WRITE_MEMCPY
  71 #define ITM_WRITE_MEMCPY(T, LSMOD, TARGET, M2)                          \
  72 void ITM_REGPARM _ITM_##LSMOD##T (_ITM_TYPE_##T *ptr INPUT(T,in))       \
  73 {                                                                       \
  74   _ITM_TYPE_##T v;                                                      \
  75   STORE(v, in);                                                         \
  76   TARGET memtransfer##M2(ptr, &v, sizeof(_ITM_TYPE_##T), false,         \
  77                          GTM::abi_dispatch::LSMOD,                      \
  78                          GTM::abi_dispatch::NONTXNAL);                  \
  79 }
  80
  81 // ??? Use memcpy for now, until we have figured out how to best instantiate
  82 // these loads/stores.
  83 CREATE_DISPATCH_FUNCTIONS_T_MEMCPY(M256, GTM::abi_disp()->, )
  84
  85 void ITM_REGPARM
  86 _ITM_LM256 (const _ITM_TYPE_M256 *ptr)
  87 {
  88   GTM::GTM_LB (ptr, sizeof (*ptr));
  89 }
  90
  91 } // extern "C"