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/**************************************************************************
*
* Copyright 2010 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 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
* THE COPYRIGHT HOLDERS, AUTHORS 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
**************************************************************************/
#include "util/u_debug.h"
#include "lp_bld_debug.h"
#include "lp_bld_const.h"
#include "lp_bld_format.h"
#include "lp_bld_gather.h"
/**
* Get the pointer to one element from scatter positions in memory.
*
* @sa lp_build_gather()
*/
LLVMValueRef
lp_build_gather_elem_ptr(LLVMBuilderRef builder,
unsigned length,
LLVMValueRef base_ptr,
LLVMValueRef offsets,
unsigned i)
{
LLVMValueRef offset;
LLVMValueRef ptr;
assert(LLVMTypeOf(base_ptr) == LLVMPointerType(LLVMInt8Type(), 0));
if (length == 1) {
assert(i == 0);
offset = offsets;
} else {
LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
offset = LLVMBuildExtractElement(builder, offsets, index, "");
}
ptr = LLVMBuildGEP(builder, base_ptr, &offset, 1, "");
return ptr;
}
/**
* Gather one element from scatter positions in memory.
*
* @sa lp_build_gather()
*/
LLVMValueRef
lp_build_gather_elem(LLVMBuilderRef builder,
unsigned length,
unsigned src_width,
unsigned dst_width,
LLVMValueRef base_ptr,
LLVMValueRef offsets,
unsigned i)
{
LLVMTypeRef src_type = LLVMIntType(src_width);
LLVMTypeRef src_ptr_type = LLVMPointerType(src_type, 0);
LLVMTypeRef dst_elem_type = LLVMIntType(dst_width);
LLVMValueRef ptr;
LLVMValueRef res;
assert(LLVMTypeOf(base_ptr) == LLVMPointerType(LLVMInt8Type(), 0));
ptr = lp_build_gather_elem_ptr(builder, length, base_ptr, offsets, i);
ptr = LLVMBuildBitCast(builder, ptr, src_ptr_type, "");
res = LLVMBuildLoad(builder, ptr, "");
assert(src_width <= dst_width);
if (src_width > dst_width)
res = LLVMBuildTrunc(builder, res, dst_elem_type, "");
if (src_width < dst_width)
res = LLVMBuildZExt(builder, res, dst_elem_type, "");
return res;
}
/**
* Gather elements from scatter positions in memory into a single vector.
* Use for fetching texels from a texture.
* For SSE, typical values are length=4, src_width=32, dst_width=32.
*
* @param length length of the offsets
* @param src_width src element width in bits
* @param dst_width result element width in bits (src will be expanded to fit)
* @param base_ptr base pointer, should be a i8 pointer type.
* @param offsets vector with offsets
*/
LLVMValueRef
lp_build_gather(LLVMBuilderRef builder,
unsigned length,
unsigned src_width,
unsigned dst_width,
LLVMValueRef base_ptr,
LLVMValueRef offsets)
{
LLVMValueRef res;
if (length == 1) {
/* Scalar */
return lp_build_gather_elem(builder, length,
src_width, dst_width,
base_ptr, offsets, 0);
} else {
/* Vector */
LLVMTypeRef dst_elem_type = LLVMIntType(dst_width);
LLVMTypeRef dst_vec_type = LLVMVectorType(dst_elem_type, length);
unsigned i;
res = LLVMGetUndef(dst_vec_type);
for (i = 0; i < length; ++i) {
LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
LLVMValueRef elem;
elem = lp_build_gather_elem(builder, length,
src_width, dst_width,
base_ptr, offsets, i);
res = LLVMBuildInsertElement(builder, res, elem, index, "");
}
}
return res;
}
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