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path: root/src/gallium/drivers/llvmpipe/lp_bld_intr.c
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/**************************************************************************
 *
 * Copyright 2009 VMware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/


/**
 * @file
 * Helper
 *
 * LLVM IR doesn't support all basic arithmetic operations we care about (most
 * notably min/max and saturated operations), and it is often necessary to
 * resort machine-specific intrinsics directly. The functions here hide all
 * these implementation details from the other modules.
 *
 * We also do simple expressions simplification here. Reasons are:
 * - it is very easy given we have all necessary information readily available
 * - LLVM optimization passes fail to simplify several vector expressions
 * - We often know value constraints which the optimization passes have no way
 *   of knowing, such as when source arguments are known to be in [0, 1] range.
 *
 * @author Jose Fonseca <jfonseca@vmware.com>
 */


#include "util/u_debug.h"

#include "lp_bld_intr.h"


LLVMValueRef
lp_build_intrinsic(LLVMBuilderRef builder,
                   const char *name,
                   LLVMTypeRef ret_type,
                   LLVMValueRef *args,
                   unsigned num_args)
{
   LLVMModuleRef module = LLVMGetGlobalParent(LLVMGetBasicBlockParent(LLVMGetInsertBlock(builder)));
   LLVMValueRef function;

   assert(num_args <= LP_MAX_FUNC_ARGS);

   function = LLVMGetNamedFunction(module, name);
   if(!function) {
      LLVMTypeRef arg_types[LP_MAX_FUNC_ARGS];
      unsigned i;
      for(i = 0; i < num_args; ++i) {
         assert(args[i]);
         arg_types[i] = LLVMTypeOf(args[i]);
      }
      function = LLVMAddFunction(module, name, LLVMFunctionType(ret_type, arg_types, num_args, 0));
      LLVMSetFunctionCallConv(function, LLVMCCallConv);
      LLVMSetLinkage(function, LLVMExternalLinkage);
   }
   assert(LLVMIsDeclaration(function));

   return LLVMBuildCall(builder, function, args, num_args, "");
}


LLVMValueRef
lp_build_intrinsic_unary(LLVMBuilderRef builder,
                         const char *name,
                         LLVMTypeRef ret_type,
                         LLVMValueRef a)
{
   return lp_build_intrinsic(builder, name, ret_type, &a, 1);
}


LLVMValueRef
lp_build_intrinsic_binary(LLVMBuilderRef builder,
                          const char *name,
                          LLVMTypeRef ret_type,
                          LLVMValueRef a,
                          LLVMValueRef b)
{
   LLVMValueRef args[2];

   args[0] = a;
   args[1] = b;

   return lp_build_intrinsic(builder, name, ret_type, args, 2);
}


LLVMValueRef
lp_build_intrinsic_map(LLVMBuilderRef builder,
                       const char *name,
                       LLVMTypeRef ret_type,
                       LLVMValueRef *args,
                       unsigned num_args)
{
   LLVMTypeRef ret_elem_type = LLVMGetElementType(ret_type);
   unsigned n = LLVMGetVectorSize(ret_type);
   unsigned i, j;
   LLVMValueRef res;

   assert(num_args <= LP_MAX_FUNC_ARGS);

   res = LLVMGetUndef(ret_type);
   for(i = 0; i < n; ++i) {
      LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
      LLVMValueRef arg_elems[LP_MAX_FUNC_ARGS];
      LLVMValueRef res_elem;
      for(j = 0; j < num_args; ++j)
         arg_elems[j] = LLVMBuildExtractElement(builder, args[j], index, "");
      res_elem = lp_build_intrinsic(builder, name, ret_elem_type, arg_elems, num_args);
      res = LLVMBuildInsertElement(builder, res, res_elem, index, "");
   }

   return res;
}


LLVMValueRef
lp_build_intrinsic_map_unary(LLVMBuilderRef builder,
                             const char *name,
                             LLVMTypeRef ret_type,
                             LLVMValueRef a)
{
   return lp_build_intrinsic_map(builder, name, ret_type, &a, 1);
}


LLVMValueRef
lp_build_intrinsic_map_binary(LLVMBuilderRef builder,
                              const char *name,
                              LLVMTypeRef ret_type,
                              LLVMValueRef a,
                              LLVMValueRef b)
{
   LLVMValueRef args[2];

   args[0] = a;
   args[1] = b;

   return lp_build_intrinsic_map(builder, name, ret_type, args, 2);
}