C++ (Cpp) lp_set_load_alignment Examples

Example #1

File: lp_bld_format_aos_array.c Project: krh/mesa

/**
 * @brief lp_build_fetch_rgba_aos_array
 *
 * \param format_desc   describes format of the image we're fetching from
 * \param dst_type      output type
 * \param base_ptr      address of the pixel block (or the texel if uncompressed)
 * \param offset        ptr offset
 */
LLVMValueRef
lp_build_fetch_rgba_aos_array(struct gallivm_state *gallivm,
                              const struct util_format_description *format_desc,
                              struct lp_type dst_type,
                              LLVMValueRef base_ptr,
                              LLVMValueRef offset)
{
    struct lp_build_context bld;
    LLVMBuilderRef builder = gallivm->builder;
    LLVMTypeRef src_elem_type, src_vec_type;
    LLVMValueRef ptr, res = NULL;
    struct lp_type src_type;

    memset(&src_type, 0, sizeof src_type);
    src_type.floating = format_desc->channel[0].type == UTIL_FORMAT_TYPE_FLOAT;
    src_type.fixed    = format_desc->channel[0].type == UTIL_FORMAT_TYPE_FIXED;
    src_type.sign     = format_desc->channel[0].type != UTIL_FORMAT_TYPE_UNSIGNED;
    src_type.norm     = format_desc->channel[0].normalized;
    src_type.width    = format_desc->channel[0].size;
    src_type.length   = format_desc->nr_channels;

    assert(src_type.length <= dst_type.length);

    src_elem_type = lp_build_elem_type(gallivm, src_type);
    src_vec_type  = lp_build_vec_type(gallivm,  src_type);

    /* Read whole vector from memory, unaligned */
    if (!res) {
        ptr = LLVMBuildGEP(builder, base_ptr, &offset, 1, "");
        ptr = LLVMBuildPointerCast(builder, ptr, LLVMPointerType(src_vec_type, 0), "");
        res = LLVMBuildLoad(builder, ptr, "");
        lp_set_load_alignment(res, src_type.width / 8);
    }

    /* Truncate doubles to float */
    if (src_type.floating && src_type.width == 64) {
        src_type.width = 32;
        src_vec_type  = lp_build_vec_type(gallivm,  src_type);

        res = LLVMBuildFPTrunc(builder, res, src_vec_type, "");
    }

    /* Expand to correct length */
    if (src_type.length < dst_type.length) {
        res = lp_build_pad_vector(gallivm, res, src_type, dst_type.length);
        src_type.length = dst_type.length;
    }

    /* Convert to correct format */
    lp_build_conv(gallivm, src_type, dst_type, &res, 1, &res, 1);

    /* Swizzle it */
    lp_build_context_init(&bld, gallivm, dst_type);
    return lp_build_format_swizzle_aos(format_desc, &bld, res);
}

Example #2

File: lp_bld_struct.c Project: venkatarajasekhar/Qt

LLVMValueRef
lp_build_pointer_get_unaligned(LLVMBuilderRef builder,
                               LLVMValueRef ptr,
                               LLVMValueRef index,
                               unsigned alignment)
{
   LLVMValueRef element_ptr;
   LLVMValueRef res;
   assert(LLVMGetTypeKind(LLVMTypeOf(ptr)) == LLVMPointerTypeKind);
   element_ptr = LLVMBuildGEP(builder, ptr, &index, 1, "");
   res = LLVMBuildLoad(builder, element_ptr, "");
   lp_set_load_alignment(res, alignment);
#ifdef DEBUG
   lp_build_name(res, "%s[%s]", LLVMGetValueName(ptr), LLVMGetValueName(index));
#endif
   return res;
}