1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
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
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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 **************************************************************************/
29 #include "pipe/p_config.h"
30 #include "pipe/p_compiler.h"
31 #include "util/u_cpu_detect.h"
32 #include "util/u_debug.h"
33 #include "util/u_memory.h"
34 #include "util/u_simple_list.h"
36 #include "lp_bld_debug.h"
37 #include "lp_bld_misc.h"
38 #include "lp_bld_init.h"
40 #include <llvm-c/Analysis.h>
41 #include <llvm-c/Transforms/Scalar.h>
42 #include <llvm-c/BitWriter.h>
46 * AVX is supported in:
47 * - standard JIT from LLVM 3.2 onwards
48 * - MC-JIT from LLVM 3.1
49 * - MC-JIT supports limited OSes (MacOSX and Linux)
50 * - standard JIT in LLVM 3.1, with backports
52 #if defined(PIPE_ARCH_PPC_64) || defined(PIPE_ARCH_S390) || defined(PIPE_ARCH_ARM) || defined(PIPE_ARCH_AARCH64)
55 #elif HAVE_LLVM >= 0x0302 || (HAVE_LLVM == 0x0301 && defined(HAVE_JIT_AVX_SUPPORT))
58 #elif HAVE_LLVM == 0x0301 && (defined(PIPE_OS_LINUX) || defined(PIPE_OS_APPLE))
68 void LLVMLinkInMCJIT();
72 * LLVM has several global caches which pointing/derived from objects
73 * owned by the context, so if we freeing contexts causes
74 * memory leaks and false cache hits when these objects are destroyed.
76 * TODO: For thread safety on multi-threaded OpenGL we should use one LLVM
77 * context per thread, and put them in a pool when threads are destroyed.
79 #define USE_GLOBAL_CONTEXT 1
83 unsigned gallivm_debug
= 0;
85 static const struct debug_named_value lp_bld_debug_flags
[] = {
86 { "tgsi", GALLIVM_DEBUG_TGSI
, NULL
},
87 { "ir", GALLIVM_DEBUG_IR
, NULL
},
88 { "asm", GALLIVM_DEBUG_ASM
, NULL
},
89 { "nopt", GALLIVM_DEBUG_NO_OPT
, NULL
},
90 { "perf", GALLIVM_DEBUG_PERF
, NULL
},
91 { "no_brilinear", GALLIVM_DEBUG_NO_BRILINEAR
, NULL
},
92 { "no_rho_approx", GALLIVM_DEBUG_NO_RHO_APPROX
, NULL
},
93 { "no_quad_lod", GALLIVM_DEBUG_NO_QUAD_LOD
, NULL
},
94 { "gc", GALLIVM_DEBUG_GC
, NULL
},
98 DEBUG_GET_ONCE_FLAGS_OPTION(gallivm_debug
, "GALLIVM_DEBUG", lp_bld_debug_flags
, 0)
102 static boolean gallivm_initialized
= FALSE
;
104 unsigned lp_native_vector_width
;
108 * Optimization values are:
111 * - 2: Default (-O2, -Os)
112 * - 3: Aggressive (-O3)
114 * See also CodeGenOpt::Level in llvm/Target/TargetMachine.h
116 enum LLVM_CodeGenOpt_Level
{
125 * Create the LLVM (optimization) pass manager and install
126 * relevant optimization passes.
127 * \return TRUE for success, FALSE for failure
130 create_pass_manager(struct gallivm_state
*gallivm
)
132 assert(!gallivm
->passmgr
);
133 assert(gallivm
->target
);
135 gallivm
->passmgr
= LLVMCreateFunctionPassManagerForModule(gallivm
->module
);
136 if (!gallivm
->passmgr
)
139 LLVMAddTargetData(gallivm
->target
, gallivm
->passmgr
);
141 if ((gallivm_debug
& GALLIVM_DEBUG_NO_OPT
) == 0) {
142 /* These are the passes currently listed in llvm-c/Transforms/Scalar.h,
143 * but there are more on SVN.
144 * TODO: Add more passes.
146 LLVMAddScalarReplAggregatesPass(gallivm
->passmgr
);
147 LLVMAddLICMPass(gallivm
->passmgr
);
148 LLVMAddCFGSimplificationPass(gallivm
->passmgr
);
149 LLVMAddReassociatePass(gallivm
->passmgr
);
151 if (sizeof(void*) == 4) {
152 /* XXX: For LLVM >= 2.7 and 32-bit build, use this order of passes to
153 * avoid generating bad code.
154 * Test with piglit glsl-vs-sqrt-zero test.
156 LLVMAddConstantPropagationPass(gallivm
->passmgr
);
157 LLVMAddPromoteMemoryToRegisterPass(gallivm
->passmgr
);
160 LLVMAddPromoteMemoryToRegisterPass(gallivm
->passmgr
);
161 LLVMAddConstantPropagationPass(gallivm
->passmgr
);
164 if (util_cpu_caps
.has_sse4_1
) {
165 /* FIXME: There is a bug in this pass, whereby the combination
166 * of fptosi and sitofp (necessary for trunc/floor/ceil/round
167 * implementation) somehow becomes invalid code.
169 LLVMAddInstructionCombiningPass(gallivm
->passmgr
);
171 LLVMAddGVNPass(gallivm
->passmgr
);
174 /* We need at least this pass to prevent the backends to fail in
177 LLVMAddPromoteMemoryToRegisterPass(gallivm
->passmgr
);
185 * Free gallivm object's LLVM allocations, but not the gallivm object itself.
188 free_gallivm_state(struct gallivm_state
*gallivm
)
190 if (gallivm
->passmgr
) {
191 LLVMDisposePassManager(gallivm
->passmgr
);
194 if (gallivm
->engine
) {
195 /* This will already destroy any associated module */
196 LLVMDisposeExecutionEngine(gallivm
->engine
);
197 } else if (gallivm
->module
) {
198 LLVMDisposeModule(gallivm
->module
);
202 /* Don't free the TargetData, it's owned by the exec engine */
204 if (gallivm
->target
) {
205 LLVMDisposeTargetData(gallivm
->target
);
209 if (gallivm
->builder
)
210 LLVMDisposeBuilder(gallivm
->builder
);
212 if (!USE_GLOBAL_CONTEXT
&& gallivm
->context
)
213 LLVMContextDispose(gallivm
->context
);
215 gallivm
->engine
= NULL
;
216 gallivm
->target
= NULL
;
217 gallivm
->module
= NULL
;
218 gallivm
->passmgr
= NULL
;
219 gallivm
->context
= NULL
;
220 gallivm
->builder
= NULL
;
225 init_gallivm_engine(struct gallivm_state
*gallivm
)
228 enum LLVM_CodeGenOpt_Level optlevel
;
232 if (gallivm_debug
& GALLIVM_DEBUG_NO_OPT
) {
239 ret
= lp_build_create_jit_compiler_for_module(&gallivm
->engine
,
245 _debug_printf("%s\n", error
);
246 LLVMDisposeMessage(error
);
252 gallivm
->target
= LLVMGetExecutionEngineTargetData(gallivm
->engine
);
253 if (!gallivm
->target
)
258 * Dump the data layout strings.
261 LLVMTargetDataRef target
= LLVMGetExecutionEngineTargetData(gallivm
->engine
);
263 char *engine_data_layout
;
265 data_layout
= LLVMCopyStringRepOfTargetData(gallivm
->target
);
266 engine_data_layout
= LLVMCopyStringRepOfTargetData(target
);
269 debug_printf("module target data = %s\n", data_layout
);
270 debug_printf("engine target data = %s\n", engine_data_layout
);
274 free(engine_data_layout
);
286 * Allocate gallivm LLVM objects.
287 * \return TRUE for success, FALSE for failure
290 init_gallivm_state(struct gallivm_state
*gallivm
)
292 assert(!gallivm
->context
);
293 assert(!gallivm
->module
);
297 if (USE_GLOBAL_CONTEXT
) {
298 gallivm
->context
= LLVMGetGlobalContext();
300 gallivm
->context
= LLVMContextCreate();
302 if (!gallivm
->context
)
305 gallivm
->module
= LLVMModuleCreateWithNameInContext("gallivm",
307 if (!gallivm
->module
)
310 gallivm
->builder
= LLVMCreateBuilderInContext(gallivm
->context
);
311 if (!gallivm
->builder
)
314 /* FIXME: MC-JIT only allows compiling one module at a time, and it must be
315 * complete when MC-JIT is created. So defer the MC-JIT engine creation for
319 if (!init_gallivm_engine(gallivm
)) {
324 * MC-JIT engine compiles the module immediately on creation, so we can't
325 * obtain the target data from it. Instead we create a target data layout
328 * The produced layout strings are not precisely the same, but should make
329 * no difference for the kind of optimization passes we run.
331 * For reference this is the layout string on x64:
333 * e-p:64:64:64-S128-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-f128:128:128-n8:16:32:64
336 * - http://llvm.org/docs/LangRef.html#datalayout
340 const unsigned pointer_size
= 8 * sizeof(void *);
342 util_snprintf(layout
, sizeof layout
, "%c-p:%u:%u:%u-i64:64:64-a0:0:%u-s0:%u:%u",
343 #ifdef PIPE_ARCH_LITTLE_ENDIAN
344 'e', // little endian
348 pointer_size
, pointer_size
, pointer_size
, // pointer size, abi alignment, preferred alignment
349 pointer_size
, // aggregate preferred alignment
350 pointer_size
, pointer_size
); // stack objects abi alignment, preferred alignment
352 gallivm
->target
= LLVMCreateTargetData(layout
);
353 if (!gallivm
->target
) {
359 if (!create_pass_manager(gallivm
))
365 free_gallivm_state(gallivm
);
373 if (gallivm_initialized
)
377 gallivm_debug
= debug_get_option_gallivm_debug();
380 lp_set_target_options();
390 /* AMD Bulldozer AVX's throughput is the same as SSE2; and because using
391 * 8-wide vector needs more floating ops than 4-wide (due to padding), it is
392 * actually more efficient to use 4-wide vectors on this processor.
395 * - http://www.anandtech.com/show/4955/the-bulldozer-review-amd-fx8150-tested/2
398 util_cpu_caps
.has_avx
&&
399 util_cpu_caps
.has_intel
) {
400 lp_native_vector_width
= 256;
402 /* Leave it at 128, even when no SIMD extensions are available.
403 * Really needs to be a multiple of 128 so can fit 4 floats.
405 lp_native_vector_width
= 128;
408 lp_native_vector_width
= debug_get_num_option("LP_NATIVE_VECTOR_WIDTH",
409 lp_native_vector_width
);
411 if (lp_native_vector_width
<= 128) {
412 /* Hide AVX support, as often LLVM AVX intrinsics are only guarded by
413 * "util_cpu_caps.has_avx" predicate, and lack the
414 * "lp_native_vector_width > 128" predicate. And also to ensure a more
415 * consistent behavior, allowing one to test SSE2 on AVX machines.
416 * XXX: should not play games with util_cpu_caps directly as it might
417 * get used for other things outside llvm too.
419 util_cpu_caps
.has_avx
= 0;
420 util_cpu_caps
.has_avx2
= 0;
425 * note these instructions are VEX-only, so can only emit if we use
426 * avx (don't want to base it on has_avx & has_f16c later as that would
427 * omit it unnecessarily on amd cpus, see above).
429 util_cpu_caps
.has_f16c
= 0;
430 util_cpu_caps
.has_xop
= 0;
433 #ifdef PIPE_ARCH_PPC_64
434 /* Set the NJ bit in VSCR to 0 so denormalized values are handled as
435 * specified by IEEE standard (PowerISA 2.06 - Section 6.3). This guarantees
436 * that some rounding and half-float to float handling does not round
438 * XXX: should eventually follow same logic on all platforms.
439 * Right now denorms get explicitly disabled (but elsewhere) for x86,
440 * whereas ppc64 explicitly enables them...
442 if (util_cpu_caps
.has_altivec
) {
443 unsigned short mask
[] = { 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
444 0xFFFF, 0xFFFF, 0xFFFE, 0xFFFF };
455 gallivm_initialized
= TRUE
;
458 /* For simulating less capable machines */
459 util_cpu_caps
.has_sse3
= 0;
460 util_cpu_caps
.has_ssse3
= 0;
461 util_cpu_caps
.has_sse4_1
= 0;
462 util_cpu_caps
.has_avx
= 0;
463 util_cpu_caps
.has_f16c
= 0;
470 * Create a new gallivm_state object.
471 * Note that we return a singleton.
473 struct gallivm_state
*
476 struct gallivm_state
*gallivm
;
478 gallivm
= CALLOC_STRUCT(gallivm_state
);
480 if (!init_gallivm_state(gallivm
)) {
491 * Destroy a gallivm_state object.
494 gallivm_destroy(struct gallivm_state
*gallivm
)
496 free_gallivm_state(gallivm
);
502 * Validate and optimze a function.
505 gallivm_optimize_function(struct gallivm_state
*gallivm
,
509 debug_printf("optimizing %s...\n", LLVMGetValueName(func
));
512 assert(gallivm
->passmgr
);
514 /* Apply optimizations to LLVM IR */
515 LLVMRunFunctionPassManager(gallivm
->passmgr
, func
);
518 if (gallivm_debug
& GALLIVM_DEBUG_IR
) {
519 /* Print the LLVM IR to stderr */
520 lp_debug_dump_value(func
);
528 * Validate a function.
531 gallivm_verify_function(struct gallivm_state
*gallivm
,
534 /* Verify the LLVM IR. If invalid, dump and abort */
536 if (LLVMVerifyFunction(func
, LLVMPrintMessageAction
)) {
537 lp_debug_dump_value(func
);
543 gallivm_optimize_function(gallivm
, func
);
545 if (gallivm_debug
& GALLIVM_DEBUG_IR
) {
546 /* Print the LLVM IR to stderr */
547 lp_debug_dump_value(func
);
554 gallivm_compile_module(struct gallivm_state
*gallivm
)
556 assert(!gallivm
->compiled
);
558 /* Dump byte code to a file */
560 LLVMWriteBitcodeToFile(gallivm
->module
, "llvmpipe.bc");
561 debug_printf("llvmpipe.bc written\n");
562 debug_printf("Invoke as \"llc -o - llvmpipe.bc\"\n");
566 assert(!gallivm
->engine
);
567 if (!init_gallivm_engine(gallivm
)) {
571 assert(gallivm
->engine
);
579 gallivm_jit_function(struct gallivm_state
*gallivm
,
583 func_pointer jit_func
;
585 assert(gallivm
->compiled
);
586 assert(gallivm
->engine
);
588 code
= LLVMGetPointerToGlobal(gallivm
->engine
, func
);
590 jit_func
= pointer_to_func(code
);
592 if (gallivm_debug
& GALLIVM_DEBUG_ASM
) {
593 lp_disassemble(func
, code
);
597 lp_profile(func
, code
);
600 /* Free the function body to save memory */
601 lp_func_delete_body(func
);
608 * Free the function (and its machine code).
611 gallivm_free_function(struct gallivm_state
*gallivm
,
617 LLVMFreeMachineCodeForFunction(gallivm
->engine
, func
);
620 LLVMDeleteFunction(func
);