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 "util/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/Config/llvm-config.h>
  42 #include <llvm-c/Analysis.h>
  43 #include <llvm-c/Transforms/Scalar.h>
  44 #if LLVM_VERSION_MAJOR >= 7
  45 #include <llvm-c/Transforms/Utils.h>
  46 #endif
  47 #include <llvm-c/BitWriter.h>
  48 #if GALLIVM_HAVE_CORO
  49 #if LLVM_VERSION_MAJOR <= 8 && (defined(PIPE_ARCH_AARCH64) || defined (PIPE_ARCH_ARM) || defined(PIPE_ARCH_S390))
  50 #include <llvm-c/Transforms/IPO.h>
  51 #endif
  52 #include <llvm-c/Transforms/Coroutines.h>
  53 #endif
  54
  55 unsigned gallivm_perf = 0;
  56
  57 static const struct debug_named_value lp_bld_perf_flags[] = {
  58    { "no_brilinear", GALLIVM_PERF_NO_BRILINEAR, "disable brilinear optimization" },
  59    { "no_rho_approx", GALLIVM_PERF_NO_RHO_APPROX, "disable rho_approx optimization" },
  60    { "no_quad_lod", GALLIVM_PERF_NO_QUAD_LOD, "disable quad_lod optimization" },
  61    { "no_aos_sampling", GALLIVM_PERF_NO_AOS_SAMPLING, "disable aos sampling optimization" },
  62    { "nopt",   GALLIVM_PERF_NO_OPT, "disable optimization passes to speed up shader compilation" },
  63    { "no_filter_hacks", GALLIVM_PERF_NO_BRILINEAR | GALLIVM_PERF_NO_RHO_APPROX |
  64      GALLIVM_PERF_NO_QUAD_LOD, "disable filter optimization hacks" },
  65    DEBUG_NAMED_VALUE_END
  66 };
  67
  68 #ifdef DEBUG
  69 unsigned gallivm_debug = 0;
  70
  71 static const struct debug_named_value lp_bld_debug_flags[] = {
  72    { "tgsi",   GALLIVM_DEBUG_TGSI, NULL },
  73    { "ir",     GALLIVM_DEBUG_IR, NULL },
  74    { "asm",    GALLIVM_DEBUG_ASM, NULL },
  75    { "perf",   GALLIVM_DEBUG_PERF, NULL },
  76    { "gc",     GALLIVM_DEBUG_GC, NULL },
  77    { "dumpbc", GALLIVM_DEBUG_DUMP_BC, NULL },
  78    DEBUG_NAMED_VALUE_END
  79 };
  80
  81 DEBUG_GET_ONCE_FLAGS_OPTION(gallivm_debug, "GALLIVM_DEBUG", lp_bld_debug_flags, 0)
  82 #endif
  83
  84
  85 static boolean gallivm_initialized = FALSE;
  86
  87 unsigned lp_native_vector_width;
  88
  89
  90 /*
  91  * Optimization values are:
  92  * - 0: None (-O0)
  93  * - 1: Less (-O1)
  94  * - 2: Default (-O2, -Os)
  95  * - 3: Aggressive (-O3)
  96  *
  97  * See also CodeGenOpt::Level in llvm/Target/TargetMachine.h
  98  */
  99 enum LLVM_CodeGenOpt_Level {
 100    None,        // -O0
 101    Less,        // -O1
 102    Default,     // -O2, -Os
 103    Aggressive   // -O3
 104 };
 105
 106
 107 /**
 108  * Create the LLVM (optimization) pass manager and install
 109  * relevant optimization passes.
 110  * \return  TRUE for success, FALSE for failure
 111  */
 112 static boolean
 113 create_pass_manager(struct gallivm_state *gallivm)
 114 {
 115    assert(!gallivm->passmgr);
 116    assert(gallivm->target);
 117
 118    gallivm->passmgr = LLVMCreateFunctionPassManagerForModule(gallivm->module);
 119    if (!gallivm->passmgr)
 120       return FALSE;
 121
 122 #if GALLIVM_HAVE_CORO
 123    gallivm->cgpassmgr = LLVMCreatePassManager();
 124 #endif
 125    /*
 126     * TODO: some per module pass manager with IPO passes might be helpful -
 127     * the generated texture functions may benefit from inlining if they are
 128     * simple, or constant propagation into them, etc.
 129     */
 130
 131    {
 132       char *td_str;
 133       // New ones from the Module.
 134       td_str = LLVMCopyStringRepOfTargetData(gallivm->target);
 135       LLVMSetDataLayout(gallivm->module, td_str);
 136       free(td_str);
 137    }
 138
 139 #if GALLIVM_HAVE_CORO
 140 #if LLVM_VERSION_MAJOR <= 8 && (defined(PIPE_ARCH_AARCH64) || defined (PIPE_ARCH_ARM) || defined(PIPE_ARCH_S390))
 141    LLVMAddArgumentPromotionPass(gallivm->cgpassmgr);
 142    LLVMAddFunctionAttrsPass(gallivm->cgpassmgr);
 143 #endif
 144    LLVMAddCoroEarlyPass(gallivm->cgpassmgr);
 145    LLVMAddCoroSplitPass(gallivm->cgpassmgr);
 146    LLVMAddCoroElidePass(gallivm->cgpassmgr);
 147 #endif
 148
 149    if ((gallivm_perf & GALLIVM_PERF_NO_OPT) == 0) {
 150       /*
 151        * TODO: Evaluate passes some more - keeping in mind
 152        * both quality of generated code and compile times.
 153        */
 154       /*
 155        * NOTE: if you change this, don't forget to change the output
 156        * with GALLIVM_DEBUG_DUMP_BC in gallivm_compile_module.
 157        */
 158       LLVMAddScalarReplAggregatesPass(gallivm->passmgr);
 159       LLVMAddEarlyCSEPass(gallivm->passmgr);
 160       LLVMAddCFGSimplificationPass(gallivm->passmgr);
 161       /*
 162        * FIXME: LICM is potentially quite useful. However, for some
 163        * rather crazy shaders the compile time can reach _hours_ per shader,
 164        * due to licm implying lcssa (since llvm 3.5), which can take forever.
 165        * Even for sane shaders, the cost of licm is rather high (and not just
 166        * due to lcssa, licm itself too), though mostly only in cases when it
 167        * can actually move things, so having to disable it is a pity.
 168        * LLVMAddLICMPass(gallivm->passmgr);
 169        */
 170       LLVMAddReassociatePass(gallivm->passmgr);
 171       LLVMAddPromoteMemoryToRegisterPass(gallivm->passmgr);
 172 #if LLVM_VERSION_MAJOR <= 11
 173       LLVMAddConstantPropagationPass(gallivm->passmgr);
 174 #endif
 175       LLVMAddInstructionCombiningPass(gallivm->passmgr);
 176       LLVMAddGVNPass(gallivm->passmgr);
 177    }
 178    else {
 179       /* We need at least this pass to prevent the backends to fail in
 180        * unexpected ways.
 181        */
 182       LLVMAddPromoteMemoryToRegisterPass(gallivm->passmgr);
 183    }
 184 #if GALLIVM_HAVE_CORO
 185    LLVMAddCoroCleanupPass(gallivm->passmgr);
 186 #endif
 187
 188    return TRUE;
 189 }
 190
 191
 192 /**
 193  * Free gallivm object's LLVM allocations, but not any generated code
 194  * nor the gallivm object itself.
 195  */
 196 void
 197 gallivm_free_ir(struct gallivm_state *gallivm)
 198 {
 199    if (gallivm->passmgr) {
 200       LLVMDisposePassManager(gallivm->passmgr);
 201    }
 202
 203 #if GALLIVM_HAVE_CORO
 204    if (gallivm->cgpassmgr) {
 205       LLVMDisposePassManager(gallivm->cgpassmgr);
 206    }
 207 #endif
 208
 209    if (gallivm->engine) {
 210       /* This will already destroy any associated module */
 211       LLVMDisposeExecutionEngine(gallivm->engine);
 212    } else if (gallivm->module) {
 213       LLVMDisposeModule(gallivm->module);
 214    }
 215
 216    if (gallivm->cache) {
 217       lp_free_objcache(gallivm->cache->jit_obj_cache);
 218       free(gallivm->cache->data);
 219    }
 220    FREE(gallivm->module_name);
 221
 222    if (gallivm->target) {
 223       LLVMDisposeTargetData(gallivm->target);
 224    }
 225
 226    if (gallivm->builder)
 227       LLVMDisposeBuilder(gallivm->builder);
 228
 229    /* The LLVMContext should be owned by the parent of gallivm. */
 230
 231    gallivm->engine = NULL;
 232    gallivm->target = NULL;
 233    gallivm->module = NULL;
 234    gallivm->module_name = NULL;
 235    gallivm->cgpassmgr = NULL;
 236    gallivm->passmgr = NULL;
 237    gallivm->context = NULL;
 238    gallivm->builder = NULL;
 239    gallivm->cache = NULL;
 240 }
 241
 242
 243 /**
 244  * Free LLVM-generated code.  Should be done AFTER gallivm_free_ir().
 245  */
 246 static void
 247 gallivm_free_code(struct gallivm_state *gallivm)
 248 {
 249    assert(!gallivm->module);
 250    assert(!gallivm->engine);
 251    lp_free_generated_code(gallivm->code);
 252    gallivm->code = NULL;
 253    lp_free_memory_manager(gallivm->memorymgr);
 254    gallivm->memorymgr = NULL;
 255 }
 256
 257
 258 static boolean
 259 init_gallivm_engine(struct gallivm_state *gallivm)
 260 {
 261    if (1) {
 262       enum LLVM_CodeGenOpt_Level optlevel;
 263       char *error = NULL;
 264       int ret;
 265
 266       if (gallivm_perf & GALLIVM_PERF_NO_OPT) {
 267          optlevel = None;
 268       }
 269       else {
 270          optlevel = Default;
 271       }
 272
 273       ret = lp_build_create_jit_compiler_for_module(&gallivm->engine,
 274                                                     &gallivm->code,
 275                                                     gallivm->cache,
 276                                                     gallivm->module,
 277                                                     gallivm->memorymgr,
 278                                                     (unsigned) optlevel,
 279                                                     &error);
 280       if (ret) {
 281          _debug_printf("%s\n", error);
 282          LLVMDisposeMessage(error);
 283          goto fail;
 284       }
 285    }
 286
 287    if (0) {
 288        /*
 289         * Dump the data layout strings.
 290         */
 291
 292        LLVMTargetDataRef target = LLVMGetExecutionEngineTargetData(gallivm->engine);
 293        char *data_layout;
 294        char *engine_data_layout;
 295
 296        data_layout = LLVMCopyStringRepOfTargetData(gallivm->target);
 297        engine_data_layout = LLVMCopyStringRepOfTargetData(target);
 298
 299        if (1) {
 300           debug_printf("module target data = %s\n", data_layout);
 301           debug_printf("engine target data = %s\n", engine_data_layout);
 302        }
 303
 304        free(data_layout);
 305        free(engine_data_layout);
 306    }
 307
 308    return TRUE;
 309
 310 fail:
 311    return FALSE;
 312 }
 313
 314
 315 /**
 316  * Allocate gallivm LLVM objects.
 317  * \return  TRUE for success, FALSE for failure
 318  */
 319 static boolean
 320 init_gallivm_state(struct gallivm_state *gallivm, const char *name,
 321                    LLVMContextRef context, struct lp_cached_code *cache)
 322 {
 323    assert(!gallivm->context);
 324    assert(!gallivm->module);
 325
 326    if (!lp_build_init())
 327       return FALSE;
 328
 329    gallivm->context = context;
 330    gallivm->cache = cache;
 331    if (!gallivm->context)
 332       goto fail;
 333
 334    gallivm->module_name = NULL;
 335    if (name) {
 336       size_t size = strlen(name) + 1;
 337       gallivm->module_name = MALLOC(size);
 338       if (gallivm->module_name) {
 339          memcpy(gallivm->module_name, name, size);
 340       }
 341    }
 342
 343    gallivm->module = LLVMModuleCreateWithNameInContext(name,
 344                                                        gallivm->context);
 345    if (!gallivm->module)
 346       goto fail;
 347
 348    gallivm->builder = LLVMCreateBuilderInContext(gallivm->context);
 349    if (!gallivm->builder)
 350       goto fail;
 351
 352    gallivm->memorymgr = lp_get_default_memory_manager();
 353    if (!gallivm->memorymgr)
 354       goto fail;
 355
 356    /* FIXME: MC-JIT only allows compiling one module at a time, and it must be
 357     * complete when MC-JIT is created. So defer the MC-JIT engine creation for
 358     * now.
 359     */
 360
 361    /*
 362     * MC-JIT engine compiles the module immediately on creation, so we can't
 363     * obtain the target data from it.  Instead we create a target data layout
 364     * from a string.
 365     *
 366     * The produced layout strings are not precisely the same, but should make
 367     * no difference for the kind of optimization passes we run.
 368     *
 369     * For reference this is the layout string on x64:
 370     *
 371     *   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
 372     *
 373     * See also:
 374     * - http://llvm.org/docs/LangRef.html#datalayout
 375     */
 376
 377    {
 378       const unsigned pointer_size = 8 * sizeof(void *);
 379       char layout[512];
 380       snprintf(layout, sizeof layout, "%c-p:%u:%u:%u-i64:64:64-a0:0:%u-s0:%u:%u",
 381 #if UTIL_ARCH_LITTLE_ENDIAN
 382                     'e', // little endian
 383 #else
 384                     'E', // big endian
 385 #endif
 386                     pointer_size, pointer_size, pointer_size, // pointer size, abi alignment, preferred alignment
 387                     pointer_size, // aggregate preferred alignment
 388                     pointer_size, pointer_size); // stack objects abi alignment, preferred alignment
 389
 390       gallivm->target = LLVMCreateTargetData(layout);
 391       if (!gallivm->target) {
 392          return FALSE;
 393       }
 394    }
 395
 396    if (!create_pass_manager(gallivm))
 397       goto fail;
 398
 399    return TRUE;
 400
 401 fail:
 402    gallivm_free_ir(gallivm);
 403    gallivm_free_code(gallivm);
 404    return FALSE;
 405 }
 406
 407
 408 boolean
 409 lp_build_init(void)
 410 {
 411    if (gallivm_initialized)
 412       return TRUE;
 413
 414
 415    /* LLVMLinkIn* are no-ops at runtime.  They just ensure the respective
 416     * component is linked at buildtime, which is sufficient for its static
 417     * constructors to be called at load time.
 418     */
 419    LLVMLinkInMCJIT();
 420
 421 #ifdef DEBUG
 422    gallivm_debug = debug_get_option_gallivm_debug();
 423 #endif
 424
 425    gallivm_perf = debug_get_flags_option("GALLIVM_PERF", lp_bld_perf_flags, 0 );
 426
 427    lp_set_target_options();
 428
 429    util_cpu_detect();
 430
 431    /* For simulating less capable machines */
 432 #ifdef DEBUG
 433    if (debug_get_bool_option("LP_FORCE_SSE2", FALSE)) {
 434       assert(util_cpu_caps.has_sse2);
 435       util_cpu_caps.has_sse3 = 0;
 436       util_cpu_caps.has_ssse3 = 0;
 437       util_cpu_caps.has_sse4_1 = 0;
 438       util_cpu_caps.has_sse4_2 = 0;
 439       util_cpu_caps.has_avx = 0;
 440       util_cpu_caps.has_avx2 = 0;
 441       util_cpu_caps.has_f16c = 0;
 442       util_cpu_caps.has_fma = 0;
 443    }
 444 #endif
 445
 446    if (util_cpu_caps.has_avx2 || util_cpu_caps.has_avx) {
 447       lp_native_vector_width = 256;
 448    } else {
 449       /* Leave it at 128, even when no SIMD extensions are available.
 450        * Really needs to be a multiple of 128 so can fit 4 floats.
 451        */
 452       lp_native_vector_width = 128;
 453    }
 454
 455    lp_native_vector_width = debug_get_num_option("LP_NATIVE_VECTOR_WIDTH",
 456                                                  lp_native_vector_width);
 457
 458 #if LLVM_VERSION_MAJOR < 4
 459    if (lp_native_vector_width <= 128) {
 460       /* Hide AVX support, as often LLVM AVX intrinsics are only guarded by
 461        * "util_cpu_caps.has_avx" predicate, and lack the
 462        * "lp_native_vector_width > 128" predicate. And also to ensure a more
 463        * consistent behavior, allowing one to test SSE2 on AVX machines.
 464        * XXX: should not play games with util_cpu_caps directly as it might
 465        * get used for other things outside llvm too.
 466        */
 467       util_cpu_caps.has_avx = 0;
 468       util_cpu_caps.has_avx2 = 0;
 469       util_cpu_caps.has_f16c = 0;
 470       util_cpu_caps.has_fma = 0;
 471    }
 472 #endif
 473
 474 #ifdef PIPE_ARCH_PPC_64
 475    /* Set the NJ bit in VSCR to 0 so denormalized values are handled as
 476     * specified by IEEE standard (PowerISA 2.06 - Section 6.3). This guarantees
 477     * that some rounding and half-float to float handling does not round
 478     * incorrectly to 0.
 479     * XXX: should eventually follow same logic on all platforms.
 480     * Right now denorms get explicitly disabled (but elsewhere) for x86,
 481     * whereas ppc64 explicitly enables them...
 482     */
 483    if (util_cpu_caps.has_altivec) {
 484       unsigned short mask[] = { 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
 485                                 0xFFFF, 0xFFFF, 0xFFFE, 0xFFFF };
 486       __asm (
 487         "mfvscr %%v1\n"
 488         "vand   %0,%%v1,%0\n"
 489         "mtvscr %0"
 490         :
 491         : "r" (*mask)
 492       );
 493    }
 494 #endif
 495
 496    gallivm_initialized = TRUE;
 497
 498    return TRUE;
 499 }
 500
 501
 502
 503 /**
 504  * Create a new gallivm_state object.
 505  */
 506 struct gallivm_state *
 507 gallivm_create(const char *name, LLVMContextRef context,
 508                struct lp_cached_code *cache)
 509 {
 510    struct gallivm_state *gallivm;
 511
 512    gallivm = CALLOC_STRUCT(gallivm_state);
 513    if (gallivm) {
 514       if (!init_gallivm_state(gallivm, name, context, cache)) {
 515          FREE(gallivm);
 516          gallivm = NULL;
 517       }
 518    }
 519
 520    assert(gallivm != NULL);
 521    return gallivm;
 522 }
 523
 524
 525 /**
 526  * Destroy a gallivm_state object.
 527  */
 528 void
 529 gallivm_destroy(struct gallivm_state *gallivm)
 530 {
 531    gallivm_free_ir(gallivm);
 532    gallivm_free_code(gallivm);
 533    FREE(gallivm);
 534 }
 535
 536
 537 /**
 538  * Validate a function.
 539  * Verification is only done with debug builds.
 540  */
 541 void
 542 gallivm_verify_function(struct gallivm_state *gallivm,
 543                         LLVMValueRef func)
 544 {
 545    /* Verify the LLVM IR.  If invalid, dump and abort */
 546 #ifdef DEBUG
 547    if (LLVMVerifyFunction(func, LLVMPrintMessageAction)) {
 548       lp_debug_dump_value(func);
 549       assert(0);
 550       return;
 551    }
 552 #endif
 553
 554    if (gallivm_debug & GALLIVM_DEBUG_IR) {
 555       /* Print the LLVM IR to stderr */
 556       lp_debug_dump_value(func);
 557       debug_printf("\n");
 558    }
 559 }
 560
 561
 562 /**
 563  * Compile a module.
 564  * This does IR optimization on all functions in the module.
 565  */
 566 void
 567 gallivm_compile_module(struct gallivm_state *gallivm)
 568 {
 569    LLVMValueRef func;
 570    int64_t time_begin = 0;
 571
 572    assert(!gallivm->compiled);
 573
 574    if (gallivm->builder) {
 575       LLVMDisposeBuilder(gallivm->builder);
 576       gallivm->builder = NULL;
 577    }
 578
 579    if (gallivm->cache && gallivm->cache->data_size) {
 580       goto skip_cached;
 581    }
 582
 583    /* Dump bitcode to a file */
 584    if (gallivm_debug & GALLIVM_DEBUG_DUMP_BC) {
 585       char filename[256];
 586       assert(gallivm->module_name);
 587       snprintf(filename, sizeof(filename), "ir_%s.bc", gallivm->module_name);
 588       LLVMWriteBitcodeToFile(gallivm->module, filename);
 589       debug_printf("%s written\n", filename);
 590       debug_printf("Invoke as \"opt %s %s | llc -O%d %s%s\"\n",
 591                    gallivm_debug & GALLIVM_PERF_NO_OPT ? "-mem2reg" :
 592                    "-sroa -early-cse -simplifycfg -reassociate "
 593                    "-mem2reg -constprop -instcombine -gvn",
 594                    filename, gallivm_debug & GALLIVM_PERF_NO_OPT ? 0 : 2,
 595                    "[-mcpu=<-mcpu option>] ",
 596                    "[-mattr=<-mattr option(s)>]");
 597    }
 598
 599    if (gallivm_debug & GALLIVM_DEBUG_PERF)
 600       time_begin = os_time_get();
 601
 602 #if GALLIVM_HAVE_CORO
 603    LLVMRunPassManager(gallivm->cgpassmgr, gallivm->module);
 604 #endif
 605    /* Run optimization passes */
 606    LLVMInitializeFunctionPassManager(gallivm->passmgr);
 607    func = LLVMGetFirstFunction(gallivm->module);
 608    while (func) {
 609       if (0) {
 610          debug_printf("optimizing func %s...\n", LLVMGetValueName(func));
 611       }
 612
 613    /* Disable frame pointer omission on debug/profile builds */
 614    /* XXX: And workaround http://llvm.org/PR21435 */
 615 #if defined(DEBUG) || defined(PROFILE) || defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64)
 616       LLVMAddTargetDependentFunctionAttr(func, "no-frame-pointer-elim", "true");
 617       LLVMAddTargetDependentFunctionAttr(func, "no-frame-pointer-elim-non-leaf", "true");
 618 #endif
 619
 620       LLVMRunFunctionPassManager(gallivm->passmgr, func);
 621       func = LLVMGetNextFunction(func);
 622    }
 623    LLVMFinalizeFunctionPassManager(gallivm->passmgr);
 624
 625    if (gallivm_debug & GALLIVM_DEBUG_PERF) {
 626       int64_t time_end = os_time_get();
 627       int time_msec = (int)((time_end - time_begin) / 1000);
 628       assert(gallivm->module_name);
 629       debug_printf("optimizing module %s took %d msec\n",
 630                    gallivm->module_name, time_msec);
 631    }
 632
 633    /* Setting the module's DataLayout to an empty string will cause the
 634     * ExecutionEngine to copy to the DataLayout string from its target machine
 635     * to the module.  As of LLVM 3.8 the module and the execution engine are
 636     * required to have the same DataLayout.
 637     *
 638     * We must make sure we do this after running the optimization passes,
 639     * because those passes need a correct datalayout string.  For example, if
 640     * those optimization passes see an empty datalayout, they will assume this
 641     * is a little endian target and will do optimizations that break big endian
 642     * machines.
 643     *
 644     * TODO: This is just a temporary work-around.  The correct solution is for
 645     * gallivm_init_state() to create a TargetMachine and pull the DataLayout
 646     * from there.  Currently, the TargetMachine used by llvmpipe is being
 647     * implicitly created by the EngineBuilder in
 648     * lp_build_create_jit_compiler_for_module()
 649     */
 650  skip_cached:
 651    LLVMSetDataLayout(gallivm->module, "");
 652    assert(!gallivm->engine);
 653    if (!init_gallivm_engine(gallivm)) {
 654       assert(0);
 655    }
 656    assert(gallivm->engine);
 657
 658    ++gallivm->compiled;
 659
 660    if (gallivm->debug_printf_hook)
 661       LLVMAddGlobalMapping(gallivm->engine, gallivm->debug_printf_hook, debug_printf);
 662
 663    if (gallivm_debug & GALLIVM_DEBUG_ASM) {
 664       LLVMValueRef llvm_func = LLVMGetFirstFunction(gallivm->module);
 665
 666       while (llvm_func) {
 667          /*
 668           * Need to filter out functions which don't have an implementation,
 669           * such as the intrinsics. May not be sufficient in case of IPO?
 670           * LLVMGetPointerToGlobal() will abort otherwise.
 671           */
 672          if (!LLVMIsDeclaration(llvm_func)) {
 673             void *func_code = LLVMGetPointerToGlobal(gallivm->engine, llvm_func);
 674             lp_disassemble(llvm_func, func_code);
 675          }
 676          llvm_func = LLVMGetNextFunction(llvm_func);
 677       }
 678    }
 679
 680 #if defined(PROFILE)
 681    {
 682       LLVMValueRef llvm_func = LLVMGetFirstFunction(gallivm->module);
 683
 684       while (llvm_func) {
 685          if (!LLVMIsDeclaration(llvm_func)) {
 686             void *func_code = LLVMGetPointerToGlobal(gallivm->engine, llvm_func);
 687             lp_profile(llvm_func, func_code);
 688          }
 689          llvm_func = LLVMGetNextFunction(llvm_func);
 690       }
 691    }
 692 #endif
 693 }
 694
 695
 696
 697 func_pointer
 698 gallivm_jit_function(struct gallivm_state *gallivm,
 699                      LLVMValueRef func)
 700 {
 701    void *code;
 702    func_pointer jit_func;
 703    int64_t time_begin = 0;
 704
 705    assert(gallivm->compiled);
 706    assert(gallivm->engine);
 707
 708    if (gallivm_debug & GALLIVM_DEBUG_PERF)
 709       time_begin = os_time_get();
 710
 711    code = LLVMGetPointerToGlobal(gallivm->engine, func);
 712    assert(code);
 713    jit_func = pointer_to_func(code);
 714
 715    if (gallivm_debug & GALLIVM_DEBUG_PERF) {
 716       int64_t time_end = os_time_get();
 717       int time_msec = (int)(time_end - time_begin) / 1000;
 718       debug_printf("   jitting func %s took %d msec\n",
 719                    LLVMGetValueName(func), time_msec);
 720    }
 721
 722    return jit_func;
 723 }