1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
31 * Helpers for emiting intrinsic calls.
33 * LLVM vanilla IR doesn't represent all basic arithmetic operations we care
34 * about, and it is often necessary to resort target-specific intrinsics for
35 * performance, convenience.
37 * Ideally we would like to stay away from target specific intrinsics and
38 * move all the instruction selection logic into upstream LLVM where it belongs.
40 * These functions are also used for calling C functions provided by us from
41 * generated LLVM code.
43 * @author Jose Fonseca <jfonseca@vmware.com>
47 #include "util/u_debug.h"
49 #include "lp_bld_const.h"
50 #include "lp_bld_intr.h"
51 #include "lp_bld_type.h"
52 #include "lp_bld_pack.h"
56 lp_declare_intrinsic(LLVMModuleRef module
,
59 LLVMTypeRef
*arg_types
,
62 LLVMTypeRef function_type
;
63 LLVMValueRef function
;
65 assert(!LLVMGetNamedFunction(module
, name
));
67 function_type
= LLVMFunctionType(ret_type
, arg_types
, num_args
, 0);
68 function
= LLVMAddFunction(module
, name
, function_type
);
70 LLVMSetFunctionCallConv(function
, LLVMCCallConv
);
71 LLVMSetLinkage(function
, LLVMExternalLinkage
);
73 assert(LLVMIsDeclaration(function
));
80 lp_build_intrinsic(LLVMBuilderRef builder
,
87 LLVMModuleRef module
= LLVMGetGlobalParent(LLVMGetBasicBlockParent(LLVMGetInsertBlock(builder
)));
88 LLVMValueRef function
;
90 function
= LLVMGetNamedFunction(module
, name
);
92 LLVMTypeRef arg_types
[LP_MAX_FUNC_ARGS
];
95 assert(num_args
<= LP_MAX_FUNC_ARGS
);
97 for(i
= 0; i
< num_args
; ++i
) {
99 arg_types
[i
] = LLVMTypeOf(args
[i
]);
102 function
= lp_declare_intrinsic(module
, name
, ret_type
, arg_types
, num_args
);
105 LLVMAddFunctionAttr(function
, attr
);
108 return LLVMBuildCall(builder
, function
, args
, num_args
, "");
113 lp_build_intrinsic_unary(LLVMBuilderRef builder
,
115 LLVMTypeRef ret_type
,
118 return lp_build_intrinsic(builder
, name
, ret_type
, &a
, 1, 0);
123 lp_build_intrinsic_binary(LLVMBuilderRef builder
,
125 LLVMTypeRef ret_type
,
129 LLVMValueRef args
[2];
134 return lp_build_intrinsic(builder
, name
, ret_type
, args
, 2, 0);
139 * Call intrinsic with arguments adapted to intrinsic vector length.
141 * Split vectors which are too large for the hw, or expand them if they
142 * are too small, so a caller calling a function which might use intrinsics
143 * doesn't need to do splitting/expansion on its own.
144 * This only supports intrinsics where src and dst types match.
147 lp_build_intrinsic_binary_anylength(struct gallivm_state
*gallivm
,
149 struct lp_type src_type
,
155 struct lp_type intrin_type
= src_type
;
156 LLVMBuilderRef builder
= gallivm
->builder
;
157 LLVMValueRef i32undef
= LLVMGetUndef(LLVMInt32TypeInContext(gallivm
->context
));
158 LLVMValueRef anative
, bnative
;
159 unsigned intrin_length
= intr_size
/ src_type
.width
;
161 intrin_type
.length
= intrin_length
;
163 if (intrin_length
> src_type
.length
) {
164 LLVMValueRef elems
[LP_MAX_VECTOR_LENGTH
];
165 LLVMValueRef constvec
, tmp
;
167 for (i
= 0; i
< src_type
.length
; i
++) {
168 elems
[i
] = lp_build_const_int32(gallivm
, i
);
170 for (; i
< intrin_length
; i
++) {
173 if (src_type
.length
== 1) {
174 LLVMTypeRef elem_type
= lp_build_elem_type(gallivm
, intrin_type
);
175 a
= LLVMBuildBitCast(builder
, a
, LLVMVectorType(elem_type
, 1), "");
176 b
= LLVMBuildBitCast(builder
, b
, LLVMVectorType(elem_type
, 1), "");
178 constvec
= LLVMConstVector(elems
, intrin_length
);
179 anative
= LLVMBuildShuffleVector(builder
, a
, a
, constvec
, "");
180 bnative
= LLVMBuildShuffleVector(builder
, b
, b
, constvec
, "");
181 tmp
= lp_build_intrinsic_binary(builder
, name
,
182 lp_build_vec_type(gallivm
, intrin_type
),
184 if (src_type
.length
> 1) {
185 constvec
= LLVMConstVector(elems
, src_type
.length
);
186 return LLVMBuildShuffleVector(builder
, tmp
, tmp
, constvec
, "");
189 return LLVMBuildExtractElement(builder
, tmp
, elems
[0], "");
192 else if (intrin_length
< src_type
.length
) {
193 unsigned num_vec
= src_type
.length
/ intrin_length
;
194 LLVMValueRef tmp
[LP_MAX_VECTOR_LENGTH
];
196 /* don't support arbitrary size here as this is so yuck */
197 if (src_type
.length
% intrin_length
) {
198 /* FIXME: This is something which should be supported
199 * but there doesn't seem to be any need for it currently
202 debug_printf("%s: should handle arbitrary vector size\n",
208 for (i
= 0; i
< num_vec
; i
++) {
209 anative
= lp_build_extract_range(gallivm
, a
, i
*intrin_length
,
211 bnative
= lp_build_extract_range(gallivm
, b
, i
*intrin_length
,
213 tmp
[i
] = lp_build_intrinsic_binary(builder
, name
,
214 lp_build_vec_type(gallivm
, intrin_type
),
217 return lp_build_concat(gallivm
, tmp
, intrin_type
, num_vec
);
220 return lp_build_intrinsic_binary(builder
, name
,
221 lp_build_vec_type(gallivm
, src_type
),
228 lp_build_intrinsic_map(struct gallivm_state
*gallivm
,
230 LLVMTypeRef ret_type
,
234 LLVMBuilderRef builder
= gallivm
->builder
;
235 LLVMTypeRef ret_elem_type
= LLVMGetElementType(ret_type
);
236 unsigned n
= LLVMGetVectorSize(ret_type
);
240 assert(num_args
<= LP_MAX_FUNC_ARGS
);
242 res
= LLVMGetUndef(ret_type
);
243 for(i
= 0; i
< n
; ++i
) {
244 LLVMValueRef index
= lp_build_const_int32(gallivm
, i
);
245 LLVMValueRef arg_elems
[LP_MAX_FUNC_ARGS
];
246 LLVMValueRef res_elem
;
247 for(j
= 0; j
< num_args
; ++j
)
248 arg_elems
[j
] = LLVMBuildExtractElement(builder
, args
[j
], index
, "");
249 res_elem
= lp_build_intrinsic(builder
, name
, ret_elem_type
, arg_elems
, num_args
, 0);
250 res
= LLVMBuildInsertElement(builder
, res
, res_elem
, index
, "");
258 lp_build_intrinsic_map_unary(struct gallivm_state
*gallivm
,
260 LLVMTypeRef ret_type
,
263 return lp_build_intrinsic_map(gallivm
, name
, ret_type
, &a
, 1);
268 lp_build_intrinsic_map_binary(struct gallivm_state
*gallivm
,
270 LLVMTypeRef ret_type
,
274 LLVMValueRef args
[2];
279 return lp_build_intrinsic_map(gallivm
, name
, ret_type
, args
, 2);