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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
* Convenient representation of SIMD types.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#ifndef LP_BLD_TYPE_H
#define LP_BLD_TYPE_H
#include <llvm-c/Core.h>
#include <pipe/p_compiler.h>
/**
* Several functions can only cope with vectors of length up to this value.
* You may need to increase that value if you want to represent bigger vectors.
*/
#define LP_MAX_VECTOR_LENGTH 16
#define LP_MAX_TYPE_WIDTH 64
/**
* The LLVM type system can't conveniently express all the things we care about
* on the types used for intermediate computations, such as signed vs unsigned,
* normalized values, or fixed point.
*/
union lp_type {
struct {
/**
* Floating-point. Cannot be used with fixed. Integer numbers are
* represented by this zero.
*/
unsigned floating:1;
/**
* Fixed-point. Cannot be used with floating. Integer numbers are
* represented by this zero.
*/
unsigned fixed:1;
/**
* Whether it can represent negative values or not.
*
* If this is not set for floating point, it means that all values are
* assumed to be positive.
*/
unsigned sign:1;
/**
* Whether values are normalized to fit [0, 1] interval, or [-1, 1]
* interval for signed types.
*
* For integer types it means the representable integer range should be
* interpreted as the interval above.
*
* For floating and fixed point formats it means the values should be
* clamped to the interval above.
*/
unsigned norm:1;
/**
* Element width.
*
* For fixed point values, the fixed point is assumed to be at half the
* width.
*/
unsigned width:14;
/**
* Vector length.
*
* width*length should be a power of two greater or equal to eight.
*
* @sa LP_MAX_VECTOR_LENGTH
*/
unsigned length:14;
};
uint32_t value;
};
/**
* We need most of the information here in order to correctly and efficiently
* translate an arithmetic operation into LLVM IR. Putting it here avoids the
* trouble of passing it as parameters.
*/
struct lp_build_context
{
LLVMBuilderRef builder;
/**
* This not only describes the input/output LLVM types, but also whether
* to normalize/clamp the results.
*/
union lp_type type;
/** Same as lp_build_undef(type) */
LLVMValueRef undef;
/** Same as lp_build_zero(type) */
LLVMValueRef zero;
/** Same as lp_build_one(type) */
LLVMValueRef one;
};
LLVMTypeRef
lp_build_elem_type(union lp_type type);
LLVMTypeRef
lp_build_vec_type(union lp_type type);
boolean
lp_check_elem_type(union lp_type type, LLVMTypeRef elem_type);
boolean
lp_check_vec_type(union lp_type type, LLVMTypeRef vec_type);
boolean
lp_check_value(union lp_type type, LLVMValueRef val);
LLVMTypeRef
lp_build_int_elem_type(union lp_type type);
LLVMTypeRef
lp_build_int_vec_type(union lp_type type);
union lp_type
lp_int_type(union lp_type type);
void
lp_build_context_init(struct lp_build_context *bld,
LLVMBuilderRef builder,
union lp_type type);
#endif /* !LP_BLD_TYPE_H */
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