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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));
if(name[0] == 'l' &&
name[1] == 'l' &&
name[2] == 'v' &&
name[3] == 'm' &&
name[4] == '.')
assert(LLVMGetIntrinsicID(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);
}
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