src/gallium/auxiliary/gallivm/lp_bld_init.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   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:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  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.
  25  *
  26  **************************************************************************/
  27
  28
  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/simple_list.h"
  35 #include "os/os_time.h"
  36 #include "lp_bld.h"
  37 #include "lp_bld_debug.h"
  38 #include "lp_bld_misc.h"
  39 #include "lp_bld_init.h"
  40
  41 #include <llvm-c/Analysis.h>
  42 #include <llvm-c/Transforms/Scalar.h>
  43 #include <llvm-c/BitWriter.h>
  44
  45
  46 /* Only MCJIT is available as of LLVM SVN r216982 */
  47 #if HAVE_LLVM >= 0x0306
  48 #  define USE_MCJIT 1
  49 #elif defined(PIPE_ARCH_PPC_64) || defined(PIPE_ARCH_S390) || defined(PIPE_ARCH_ARM) || defined(PIPE_ARCH_AARCH64)
  50 #  define USE_MCJIT 1
  51 #endif
  52
  53 #if defined(USE_MCJIT)
  54 static const bool use_mcjit = USE_MCJIT;
  55 #else
  56 static bool use_mcjit = FALSE;
  57 #endif
  58
  59
  60 #ifdef DEBUG
  61 unsigned gallivm_debug = 0;
  62
  63 static const struct debug_named_value lp_bld_debug_flags[] = {
  64    { "tgsi",   GALLIVM_DEBUG_TGSI, NULL },
  65    { "ir",     GALLIVM_DEBUG_IR, NULL },
  66    { "asm",    GALLIVM_DEBUG_ASM, NULL },
  67    { "nopt",   GALLIVM_DEBUG_NO_OPT, NULL },
  68    { "perf",   GALLIVM_DEBUG_PERF, NULL },
  69    { "no_brilinear", GALLIVM_DEBUG_NO_BRILINEAR, NULL },
  70    { "no_rho_approx", GALLIVM_DEBUG_NO_RHO_APPROX, NULL },
  71    { "no_quad_lod", GALLIVM_DEBUG_NO_QUAD_LOD, NULL },
  72    { "gc",     GALLIVM_DEBUG_GC, NULL },
  73    { "dumpbc", GALLIVM_DEBUG_DUMP_BC, NULL },
  74    DEBUG_NAMED_VALUE_END
  75 };
  76
  77 DEBUG_GET_ONCE_FLAGS_OPTION(gallivm_debug, "GALLIVM_DEBUG", lp_bld_debug_flags, 0)
  78 #endif
  79
  80
  81 static boolean gallivm_initialized = FALSE;
  82
  83 unsigned lp_native_vector_width;
  84
  85
  86 /*
  87  * Optimization values are:
  88  * - 0: None (-O0)
  89  * - 1: Less (-O1)
  90  * - 2: Default (-O2, -Os)
  91  * - 3: Aggressive (-O3)
  92  *
  93  * See also CodeGenOpt::Level in llvm/Target/TargetMachine.h
  94  */
  95 enum LLVM_CodeGenOpt_Level {
  96    None,        // -O0
  97    Less,        // -O1
  98    Default,     // -O2, -Os
  99    Aggressive   // -O3
 100 };
 101
 102
 103 /**
 104  * Create the LLVM (optimization) pass manager and install
 105  * relevant optimization passes.
 106  * \return  TRUE for success, FALSE for failure
 107  */
 108 static boolean
 109 create_pass_manager(struct gallivm_state *gallivm)
 110 {
 111    assert(!gallivm->passmgr);
 112    assert(gallivm->target);
 113
 114    gallivm->passmgr = LLVMCreateFunctionPassManagerForModule(gallivm->module);
 115    if (!gallivm->passmgr)
 116       return FALSE;
 117    /*
 118     * TODO: some per module pass manager with IPO passes might be helpful -
 119     * the generated texture functions may benefit from inlining if they are
 120     * simple, or constant propagation into them, etc.
 121     */
 122
 123 #if HAVE_LLVM < 0x0309
 124    // Old versions of LLVM get the DataLayout from the pass manager.
 125    LLVMAddTargetData(gallivm->target, gallivm->passmgr);
 126 #endif
 127
 128    {
 129       char *td_str;
 130       // New ones from the Module.
 131       td_str = LLVMCopyStringRepOfTargetData(gallivm->target);
 132       LLVMSetDataLayout(gallivm->module, td_str);
 133       free(td_str);
 134    }
 135
 136    if ((gallivm_debug & GALLIVM_DEBUG_NO_OPT) == 0) {
 137       /* These are the passes currently listed in llvm-c/Transforms/Scalar.h,
 138        * but there are more on SVN.
 139        * TODO: Add more passes.
 140        */
 141       LLVMAddScalarReplAggregatesPass(gallivm->passmgr);
 142       LLVMAddLICMPass(gallivm->passmgr);
 143       LLVMAddCFGSimplificationPass(gallivm->passmgr);
 144       LLVMAddReassociatePass(gallivm->passmgr);
 145       LLVMAddPromoteMemoryToRegisterPass(gallivm->passmgr);
 146       LLVMAddConstantPropagationPass(gallivm->passmgr);
 147       LLVMAddInstructionCombiningPass(gallivm->passmgr);
 148       LLVMAddGVNPass(gallivm->passmgr);
 149    }
 150    else {
 151       /* We need at least this pass to prevent the backends to fail in
 152        * unexpected ways.
 153        */
 154       LLVMAddPromoteMemoryToRegisterPass(gallivm->passmgr);
 155    }
 156
 157    return TRUE;
 158 }
 159
 160
 161 /**
 162  * Free gallivm object's LLVM allocations, but not any generated code
 163  * nor the gallivm object itself.
 164  */
 165 void
 166 gallivm_free_ir(struct gallivm_state *gallivm)
 167 {
 168    if (gallivm->passmgr) {
 169       LLVMDisposePassManager(gallivm->passmgr);
 170    }
 171
 172    if (gallivm->engine) {
 173       /* This will already destroy any associated module */
 174       LLVMDisposeExecutionEngine(gallivm->engine);
 175    } else if (gallivm->module) {
 176       LLVMDisposeModule(gallivm->module);
 177    }
 178
 179    FREE(gallivm->module_name);
 180
 181    if (!use_mcjit) {
 182       /* Don't free the TargetData, it's owned by the exec engine */
 183    } else {
 184       if (gallivm->target) {
 185          LLVMDisposeTargetData(gallivm->target);
 186       }
 187    }
 188
 189    if (gallivm->builder)
 190       LLVMDisposeBuilder(gallivm->builder);
 191
 192    /* The LLVMContext should be owned by the parent of gallivm. */
 193
 194    gallivm->engine = NULL;
 195    gallivm->target = NULL;
 196    gallivm->module = NULL;
 197    gallivm->module_name = NULL;
 198    gallivm->passmgr = NULL;
 199    gallivm->context = NULL;
 200    gallivm->builder = NULL;
 201 }
 202
 203
 204 /**
 205  * Free LLVM-generated code.  Should be done AFTER gallivm_free_ir().
 206  */
 207 static void
 208 gallivm_free_code(struct gallivm_state *gallivm)
 209 {
 210    assert(!gallivm->module);
 211    assert(!gallivm->engine);
 212    lp_free_generated_code(gallivm->code);
 213    gallivm->code = NULL;
 214    lp_free_memory_manager(gallivm->memorymgr);
 215    gallivm->memorymgr = NULL;
 216 }
 217
 218
 219 static boolean
 220 init_gallivm_engine(struct gallivm_state *gallivm)
 221 {
 222    if (1) {
 223       enum LLVM_CodeGenOpt_Level optlevel;
 224       char *error = NULL;
 225       int ret;
 226
 227       if (gallivm_debug & GALLIVM_DEBUG_NO_OPT) {
 228          optlevel = None;
 229       }
 230       else {
 231          optlevel = Default;
 232       }
 233
 234       ret = lp_build_create_jit_compiler_for_module(&gallivm->engine,
 235                                                     &gallivm->code,
 236                                                     gallivm->module,
 237                                                     gallivm->memorymgr,
 238                                                     (unsigned) optlevel,
 239                                                     use_mcjit,
 240                                                     &error);
 241       if (ret) {
 242          _debug_printf("%s\n", error);
 243          LLVMDisposeMessage(error);
 244          goto fail;
 245       }
 246    }
 247
 248    if (!use_mcjit) {
 249       gallivm->target = LLVMGetExecutionEngineTargetData(gallivm->engine);
 250       if (!gallivm->target)
 251          goto fail;
 252    } else {
 253       if (0) {
 254           /*
 255            * Dump the data layout strings.
 256            */
 257
 258           LLVMTargetDataRef target = LLVMGetExecutionEngineTargetData(gallivm->engine);
 259           char *data_layout;
 260           char *engine_data_layout;
 261
 262           data_layout = LLVMCopyStringRepOfTargetData(gallivm->target);
 263           engine_data_layout = LLVMCopyStringRepOfTargetData(target);
 264
 265           if (1) {
 266              debug_printf("module target data = %s\n", data_layout);
 267              debug_printf("engine target data = %s\n", engine_data_layout);
 268           }
 269
 270           free(data_layout);
 271           free(engine_data_layout);
 272       }
 273    }
 274
 275    return TRUE;
 276
 277 fail:
 278    return FALSE;
 279 }
 280
 281
 282 /**
 283  * Allocate gallivm LLVM objects.
 284  * \return  TRUE for success, FALSE for failure
 285  */
 286 static boolean
 287 init_gallivm_state(struct gallivm_state *gallivm, const char *name,
 288                    LLVMContextRef context)
 289 {
 290    assert(!gallivm->context);
 291    assert(!gallivm->module);
 292
 293    if (!lp_build_init())
 294       return FALSE;
 295
 296    gallivm->context = context;
 297
 298    if (!gallivm->context)
 299       goto fail;
 300
 301    gallivm->module_name = NULL;
 302    if (name) {
 303       size_t size = strlen(name) + 1;
 304       gallivm->module_name = MALLOC(size);
 305       if (gallivm->module_name) {
 306          memcpy(gallivm->module_name, name, size);
 307       }
 308    }
 309
 310    gallivm->module = LLVMModuleCreateWithNameInContext(name,
 311                                                        gallivm->context);
 312    if (!gallivm->module)
 313       goto fail;
 314
 315    gallivm->builder = LLVMCreateBuilderInContext(gallivm->context);
 316    if (!gallivm->builder)
 317       goto fail;
 318
 319    gallivm->memorymgr = lp_get_default_memory_manager();
 320    if (!gallivm->memorymgr)
 321       goto fail;
 322
 323    /* FIXME: MC-JIT only allows compiling one module at a time, and it must be
 324     * complete when MC-JIT is created. So defer the MC-JIT engine creation for
 325     * now.
 326     */
 327    if (!use_mcjit) {
 328       if (!init_gallivm_engine(gallivm)) {
 329          goto fail;
 330       }
 331    } else {
 332       /*
 333        * MC-JIT engine compiles the module immediately on creation, so we can't
 334        * obtain the target data from it.  Instead we create a target data layout
 335        * from a string.
 336        *
 337        * The produced layout strings are not precisely the same, but should make
 338        * no difference for the kind of optimization passes we run.
 339        *
 340        * For reference this is the layout string on x64:
 341        *
 342        *   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
 343        *
 344        * See also:
 345        * - http://llvm.org/docs/LangRef.html#datalayout
 346        */
 347
 348       {
 349          const unsigned pointer_size = 8 * sizeof(void *);
 350          char layout[512];
 351          util_snprintf(layout, sizeof layout, "%c-p:%u:%u:%u-i64:64:64-a0:0:%u-s0:%u:%u",
 352 #ifdef PIPE_ARCH_LITTLE_ENDIAN
 353                        'e', // little endian
 354 #else
 355                        'E', // big endian
 356 #endif
 357                        pointer_size, pointer_size, pointer_size, // pointer size, abi alignment, preferred alignment
 358                        pointer_size, // aggregate preferred alignment
 359                        pointer_size, pointer_size); // stack objects abi alignment, preferred alignment
 360
 361          gallivm->target = LLVMCreateTargetData(layout);
 362          if (!gallivm->target) {
 363             return FALSE;
 364          }
 365       }
 366    }
 367
 368    if (!create_pass_manager(gallivm))
 369       goto fail;
 370
 371    return TRUE;
 372
 373 fail:
 374    gallivm_free_ir(gallivm);
 375    gallivm_free_code(gallivm);
 376    return FALSE;
 377 }
 378
 379
 380 boolean
 381 lp_build_init(void)
 382 {
 383    if (gallivm_initialized)
 384       return TRUE;
 385
 386
 387    /* LLVMLinkIn* are no-ops at runtime.  They just ensure the respective
 388     * component is linked at buildtime, which is sufficient for its static
 389     * constructors to be called at load time.
 390     */
 391 #if defined(USE_MCJIT)
 392 #  if USE_MCJIT
 393       LLVMLinkInMCJIT();
 394 #  else
 395       LLVMLinkInJIT();
 396 #  endif
 397 #else
 398    use_mcjit = debug_get_bool_option("GALLIVM_MCJIT", FALSE);
 399    LLVMLinkInJIT();
 400    LLVMLinkInMCJIT();
 401 #endif
 402
 403 #ifdef DEBUG
 404    gallivm_debug = debug_get_option_gallivm_debug();
 405 #endif
 406
 407    lp_set_target_options();
 408
 409    util_cpu_detect();
 410
 411    /* For simulating less capable machines */
 412 #ifdef DEBUG
 413    if (debug_get_bool_option("LP_FORCE_SSE2", FALSE)) {
 414       assert(util_cpu_caps.has_sse2);
 415       util_cpu_caps.has_sse3 = 0;
 416       util_cpu_caps.has_ssse3 = 0;
 417       util_cpu_caps.has_sse4_1 = 0;
 418       util_cpu_caps.has_sse4_2 = 0;
 419       util_cpu_caps.has_avx = 0;
 420       util_cpu_caps.has_avx2 = 0;
 421       util_cpu_caps.has_f16c = 0;
 422       util_cpu_caps.has_fma = 0;
 423    }
 424 #endif
 425
 426    /* AMD Bulldozer AVX's throughput is the same as SSE2; and because using
 427     * 8-wide vector needs more floating ops than 4-wide (due to padding), it is
 428     * actually more efficient to use 4-wide vectors on this processor.
 429     *
 430     * See also:
 431     * - http://www.anandtech.com/show/4955/the-bulldozer-review-amd-fx8150-tested/2
 432     */
 433    if (util_cpu_caps.has_avx &&
 434        util_cpu_caps.has_intel) {
 435       lp_native_vector_width = 256;
 436    } else {
 437       /* Leave it at 128, even when no SIMD extensions are available.
 438        * Really needs to be a multiple of 128 so can fit 4 floats.
 439        */
 440       lp_native_vector_width = 128;
 441    }
 442
 443    lp_native_vector_width = debug_get_num_option("LP_NATIVE_VECTOR_WIDTH",
 444                                                  lp_native_vector_width);
 445
 446    if (lp_native_vector_width <= 128) {
 447       /* Hide AVX support, as often LLVM AVX intrinsics are only guarded by
 448        * "util_cpu_caps.has_avx" predicate, and lack the
 449        * "lp_native_vector_width > 128" predicate. And also to ensure a more
 450        * consistent behavior, allowing one to test SSE2 on AVX machines.
 451        * XXX: should not play games with util_cpu_caps directly as it might
 452        * get used for other things outside llvm too.
 453        */
 454       util_cpu_caps.has_avx = 0;
 455       util_cpu_caps.has_avx2 = 0;
 456       util_cpu_caps.has_f16c = 0;
 457       util_cpu_caps.has_fma = 0;
 458    }
 459    if (HAVE_LLVM < 0x0304 || !use_mcjit) {
 460       /* AVX2 support has only been tested with LLVM 3.4, and it requires
 461        * MCJIT. */
 462       util_cpu_caps.has_avx2 = 0;
 463    }
 464
 465 #ifdef PIPE_ARCH_PPC_64
 466    /* Set the NJ bit in VSCR to 0 so denormalized values are handled as
 467     * specified by IEEE standard (PowerISA 2.06 - Section 6.3). This guarantees
 468     * that some rounding and half-float to float handling does not round
 469     * incorrectly to 0.
 470     * XXX: should eventually follow same logic on all platforms.
 471     * Right now denorms get explicitly disabled (but elsewhere) for x86,
 472     * whereas ppc64 explicitly enables them...
 473     */
 474    if (util_cpu_caps.has_altivec) {
 475       unsigned short mask[] = { 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
 476                                 0xFFFF, 0xFFFF, 0xFFFE, 0xFFFF };
 477       __asm (
 478         "mfvscr %%v1\n"
 479         "vand   %0,%%v1,%0\n"
 480         "mtvscr %0"
 481         :
 482         : "r" (*mask)
 483       );
 484    }
 485 #endif
 486
 487    gallivm_initialized = TRUE;
 488
 489    return TRUE;
 490 }
 491
 492
 493
 494 /**
 495  * Create a new gallivm_state object.
 496  */
 497 struct gallivm_state *
 498 gallivm_create(const char *name, LLVMContextRef context)
 499 {
 500    struct gallivm_state *gallivm;
 501
 502    gallivm = CALLOC_STRUCT(gallivm_state);
 503    if (gallivm) {
 504       if (!init_gallivm_state(gallivm, name, context)) {
 505          FREE(gallivm);
 506          gallivm = NULL;
 507       }
 508    }
 509
 510    return gallivm;
 511 }
 512
 513
 514 /**
 515  * Destroy a gallivm_state object.
 516  */
 517 void
 518 gallivm_destroy(struct gallivm_state *gallivm)
 519 {
 520    gallivm_free_ir(gallivm);
 521    gallivm_free_code(gallivm);
 522    FREE(gallivm);
 523 }
 524
 525
 526 /**
 527  * Validate a function.
 528  * Verification is only done with debug builds.
 529  */
 530 void
 531 gallivm_verify_function(struct gallivm_state *gallivm,
 532                         LLVMValueRef func)
 533 {
 534    /* Verify the LLVM IR.  If invalid, dump and abort */
 535 #ifdef DEBUG
 536    if (LLVMVerifyFunction(func, LLVMPrintMessageAction)) {
 537       lp_debug_dump_value(func);
 538       assert(0);
 539       return;
 540    }
 541 #endif
 542
 543    if (gallivm_debug & GALLIVM_DEBUG_IR) {
 544       /* Print the LLVM IR to stderr */
 545       lp_debug_dump_value(func);
 546       debug_printf("\n");
 547    }
 548 }
 549
 550
 551 /**
 552  * Compile a module.
 553  * This does IR optimization on all functions in the module.
 554  */
 555 void
 556 gallivm_compile_module(struct gallivm_state *gallivm)
 557 {
 558    LLVMValueRef func;
 559    int64_t time_begin = 0;
 560
 561    assert(!gallivm->compiled);
 562
 563    if (gallivm->builder) {
 564       LLVMDisposeBuilder(gallivm->builder);
 565       gallivm->builder = NULL;
 566    }
 567
 568    if (gallivm_debug & GALLIVM_DEBUG_PERF)
 569       time_begin = os_time_get();
 570
 571    /* Run optimization passes */
 572    LLVMInitializeFunctionPassManager(gallivm->passmgr);
 573    func = LLVMGetFirstFunction(gallivm->module);
 574    while (func) {
 575       if (0) {
 576          debug_printf("optimizing func %s...\n", LLVMGetValueName(func));
 577       }
 578
 579    /* Disable frame pointer omission on debug/profile builds */
 580    /* XXX: And workaround http://llvm.org/PR21435 */
 581 #if HAVE_LLVM >= 0x0307 && \
 582     (defined(DEBUG) || defined(PROFILE) || \
 583      defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64))
 584       LLVMAddTargetDependentFunctionAttr(func, "no-frame-pointer-elim", "true");
 585       LLVMAddTargetDependentFunctionAttr(func, "no-frame-pointer-elim-non-leaf", "true");
 586 #endif
 587
 588       LLVMRunFunctionPassManager(gallivm->passmgr, func);
 589       func = LLVMGetNextFunction(func);
 590    }
 591    LLVMFinalizeFunctionPassManager(gallivm->passmgr);
 592
 593    if (gallivm_debug & GALLIVM_DEBUG_PERF) {
 594       int64_t time_end = os_time_get();
 595       int time_msec = (int)(time_end - time_begin) / 1000;
 596       assert(gallivm->module_name);
 597       debug_printf("optimizing module %s took %d msec\n",
 598                    gallivm->module_name, time_msec);
 599    }
 600
 601    /* Dump byte code to a file */
 602    if (gallivm_debug & GALLIVM_DEBUG_DUMP_BC) {
 603       char filename[256];
 604       assert(gallivm->module_name);
 605       util_snprintf(filename, sizeof(filename), "ir_%s.bc", gallivm->module_name);
 606       LLVMWriteBitcodeToFile(gallivm->module, filename);
 607       debug_printf("%s written\n", filename);
 608       debug_printf("Invoke as \"llc %s%s -o - %s\"\n",
 609                    (HAVE_LLVM >= 0x0305) ? "[-mcpu=<-mcpu option] " : "",
 610                    "[-mattr=<-mattr option(s)>]",
 611                    filename);
 612    }
 613
 614    if (use_mcjit) {
 615       /* Setting the module's DataLayout to an empty string will cause the
 616        * ExecutionEngine to copy to the DataLayout string from its target
 617        * machine to the module.  As of LLVM 3.8 the module and the execution
 618        * engine are required to have the same DataLayout.
 619        *
 620        * We must make sure we do this after running the optimization passes,
 621        * because those passes need a correct datalayout string.  For example,
 622        * if those optimization passes see an empty datalayout, they will assume
 623        * this is a little endian target and will do optimizations that break big
 624        * endian machines.
 625        *
 626        * TODO: This is just a temporary work-around.  The correct solution is
 627        * for gallivm_init_state() to create a TargetMachine and pull the
 628        * DataLayout from there.  Currently, the TargetMachine used by llvmpipe
 629        * is being implicitly created by the EngineBuilder in
 630        * lp_build_create_jit_compiler_for_module()
 631        */
 632       LLVMSetDataLayout(gallivm->module, "");
 633       assert(!gallivm->engine);
 634       if (!init_gallivm_engine(gallivm)) {
 635          assert(0);
 636       }
 637    }
 638    assert(gallivm->engine);
 639
 640    ++gallivm->compiled;
 641
 642    if (gallivm_debug & GALLIVM_DEBUG_ASM) {
 643       LLVMValueRef llvm_func = LLVMGetFirstFunction(gallivm->module);
 644
 645       while (llvm_func) {
 646          /*
 647           * Need to filter out functions which don't have an implementation,
 648           * such as the intrinsics. May not be sufficient in case of IPO?
 649           * LLVMGetPointerToGlobal() will abort otherwise.
 650           */
 651          if (!LLVMIsDeclaration(llvm_func)) {
 652             void *func_code = LLVMGetPointerToGlobal(gallivm->engine, llvm_func);
 653             lp_disassemble(llvm_func, func_code);
 654          }
 655          llvm_func = LLVMGetNextFunction(llvm_func);
 656       }
 657    }
 658
 659 #if defined(PROFILE)
 660    {
 661       LLVMValueRef llvm_func = LLVMGetFirstFunction(gallivm->module);
 662
 663       while (llvm_func) {
 664          if (!LLVMIsDeclaration(llvm_func)) {
 665             void *func_code = LLVMGetPointerToGlobal(gallivm->engine, llvm_func);
 666             lp_profile(llvm_func, func_code);
 667          }
 668          llvm_func = LLVMGetNextFunction(llvm_func);
 669       }
 670    }
 671 #endif
 672 }
 673
 674
 675
 676 func_pointer
 677 gallivm_jit_function(struct gallivm_state *gallivm,
 678                      LLVMValueRef func)
 679 {
 680    void *code;
 681    func_pointer jit_func;
 682    int64_t time_begin = 0;
 683
 684    assert(gallivm->compiled);
 685    assert(gallivm->engine);
 686
 687    if (gallivm_debug & GALLIVM_DEBUG_PERF)
 688       time_begin = os_time_get();
 689
 690    code = LLVMGetPointerToGlobal(gallivm->engine, func);
 691    assert(code);
 692    jit_func = pointer_to_func(code);
 693
 694    if (gallivm_debug & GALLIVM_DEBUG_PERF) {
 695       int64_t time_end = os_time_get();
 696       int time_msec = (int)(time_end - time_begin) / 1000;
 697       debug_printf("   jitting func %s took %d msec\n",
 698                    LLVMGetValueName(func), time_msec);
 699    }
 700
 701    return jit_func;
 702 }