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      1 /*
      2  * Copyright 2012, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "bcc/Support/TargetCompilerConfigs.h"
     18 
     19 // Get ARM version number (i.e., __ARM_ARCH__)
     20 #ifdef __arm__
     21 #include <machine/cpu-features.h>
     22 #endif
     23 
     24 using namespace bcc;
     25 
     26 //===----------------------------------------------------------------------===//
     27 // ARM
     28 //===----------------------------------------------------------------------===//
     29 #if defined(PROVIDE_ARM_CODEGEN)
     30 
     31 bool ARMBaseCompilerConfig::HasThumb2() {
     32 #if !defined(TARGET_BUILD)
     33   // Cross-compiler can always generate Thumb-2 instructions.
     34   return true;
     35 #else // defined(TARGET_BUILD)
     36 #  if (__ARM_ARCH__ >= 7) || defined(__ARM_ARCH_6T2__)
     37   return true;
     38 #  else
     39   // ARM prior to V6T2 doesn't support Thumb-2.
     40   return false;
     41 #  endif
     42 #endif
     43 }
     44 
     45 void
     46 ARMBaseCompilerConfig::GetFeatureVector(std::vector<std::string> &pAttributes,
     47                                         bool pInThumbMode, bool pEnableNEON) {
     48 #if defined(ARCH_ARM_HAVE_VFP)
     49   pAttributes.push_back("+vfp3");
     50 #  if !defined(ARCH_ARM_HAVE_VFP_D32)
     51   pAttributes.push_back("+d16");
     52 #  endif
     53 #endif
     54 
     55   if (pInThumbMode) {
     56     if (HasThumb2()) {
     57       pAttributes.push_back("+thumb2");
     58     } else {
     59       pAttributes.push_back("-thumb2");
     60     }
     61   }
     62 
     63 #if defined(ARCH_ARM_HAVE_NEON)
     64   if (pEnableNEON) {
     65     pAttributes.push_back("+neon");
     66   } else {
     67     pAttributes.push_back("-neon");
     68     pAttributes.push_back("-neonfp");
     69   }
     70 #else
     71   pAttributes.push_back("-neon");
     72   pAttributes.push_back("-neonfp");
     73 #endif
     74 
     75   return;
     76 }
     77 
     78 ARMBaseCompilerConfig::ARMBaseCompilerConfig(const std::string &pTriple,
     79                                              bool pInThumbMode)
     80   : CompilerConfig(pTriple), mInThumbMode(pInThumbMode) {
     81 
     82   // Enable NEON by default.
     83   mEnableNEON = true;
     84 
     85   std::vector<std::string> attributes;
     86   GetFeatureVector(attributes, mInThumbMode, mEnableNEON);
     87   setFeatureString(attributes);
     88 
     89   return;
     90 }
     91 
     92 bool ARMBaseCompilerConfig::enableNEON(bool pEnable) {
     93 #if defined(ARCH_ARM_HAVE_NEON)
     94   if (mEnableNEON != pEnable) {
     95     std::vector<std::string> attributes;
     96     GetFeatureVector(attributes, mInThumbMode, pEnable);
     97     setFeatureString(attributes);
     98     mEnableNEON = pEnable;
     99     return true;
    100   }
    101   // Fall-through
    102 #endif
    103   return false;
    104 }
    105 #endif // defined(PROVIDE_ARM_CODEGEN)
    106