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       LLVMAddConstantPropagationPass(gallivm->passmgr);
 173       LLVMAddInstructionCombiningPass(gallivm->passmgr);
 174       LLVMAddGVNPass(gallivm->passmgr);
 175 #if GALLIVM_HAVE_CORO
 176       LLVMAddCoroCleanupPass(gallivm->passmgr);
 177 #endif
 178    }
 179    else {
 180       /* We need at least this pass to prevent the backends to fail in
 181        * unexpected ways.
 182        */
 183       LLVMAddPromoteMemoryToRegisterPass(gallivm->passmgr);
 184    }
 185
 186    return TRUE;
 187 }
 188
 189
 190 /**
 191  * Free gallivm object's LLVM allocations, but not any generated code
 192  * nor the gallivm object itself.
 193  */
 194 void
 195 gallivm_free_ir(struct gallivm_state *gallivm)
 196 {
 197    if (gallivm->passmgr) {
 198       LLVMDisposePassManager(gallivm->passmgr);
 199    }
 200
 201 #if GALLIVM_HAVE_CORO
 202    if (gallivm->cgpassmgr) {
 203       LLVMDisposePassManager(gallivm->cgpassmgr);
 204    }
 205 #endif
 206
 207    if (gallivm->engine) {
 208       /* This will already destroy any associated module */
 209       LLVMDisposeExecutionEngine(gallivm->engine);
 210    } else if (gallivm->module) {
 211       LLVMDisposeModule(gallivm->module);
 212    }
 213
 214    FREE(gallivm->module_name);
 215
 216    if (gallivm->target) {
 217       LLVMDisposeTargetData(gallivm->target);
 218    }
 219
 220    if (gallivm->builder)
 221       LLVMDisposeBuilder(gallivm->builder);
 222
 223    /* The LLVMContext should be owned by the parent of gallivm. */
 224
 225    gallivm->engine = NULL;
 226    gallivm->target = NULL;
 227    gallivm->module = NULL;
 228    gallivm->module_name = NULL;
 229    gallivm->cgpassmgr = NULL;
 230    gallivm->passmgr = NULL;
 231    gallivm->context = NULL;
 232    gallivm->builder = NULL;
 233 }
 234
 235
 236 /**
 237  * Free LLVM-generated code.  Should be done AFTER gallivm_free_ir().
 238  */
 239 static void
 240 gallivm_free_code(struct gallivm_state *gallivm)
 241 {
 242    assert(!gallivm->module);
 243    assert(!gallivm->engine);
 244    lp_free_generated_code(gallivm->code);
 245    gallivm->code = NULL;
 246    lp_free_memory_manager(gallivm->memorymgr);
 247    gallivm->memorymgr = NULL;
 248 }
 249
 250
 251 static boolean
 252 init_gallivm_engine(struct gallivm_state *gallivm)
 253 {
 254    if (1) {
 255       enum LLVM_CodeGenOpt_Level optlevel;
 256       char *error = NULL;
 257       int ret;
 258
 259       if (gallivm_perf & GALLIVM_PERF_NO_OPT) {
 260          optlevel = None;
 261       }
 262       else {
 263          optlevel = Default;
 264       }
 265
 266       ret = lp_build_create_jit_compiler_for_module(&gallivm->engine,
 267                                                     &gallivm->code,
 268                                                     gallivm->module,
 269                                                     gallivm->memorymgr,
 270                                                     (unsigned) optlevel,
 271                                                     &error);
 272       if (ret) {
 273          _debug_printf("%s\n", error);
 274          LLVMDisposeMessage(error);
 275          goto fail;
 276       }
 277    }
 278
 279    if (0) {
 280        /*
 281         * Dump the data layout strings.
 282         */
 283
 284        LLVMTargetDataRef target = LLVMGetExecutionEngineTargetData(gallivm->engine);
 285        char *data_layout;
 286        char *engine_data_layout;
 287
 288        data_layout = LLVMCopyStringRepOfTargetData(gallivm->target);
 289        engine_data_layout = LLVMCopyStringRepOfTargetData(target);
 290
 291        if (1) {
 292           debug_printf("module target data = %s\n", data_layout);
 293           debug_printf("engine target data = %s\n", engine_data_layout);
 294        }
 295
 296        free(data_layout);
 297        free(engine_data_layout);
 298    }
 299
 300    return TRUE;
 301
 302 fail:
 303    return FALSE;
 304 }
 305
 306
 307 /**
 308  * Allocate gallivm LLVM objects.
 309  * \return  TRUE for success, FALSE for failure
 310  */
 311 static boolean
 312 init_gallivm_state(struct gallivm_state *gallivm, const char *name,
 313                    LLVMContextRef context)
 314 {
 315    assert(!gallivm->context);
 316    assert(!gallivm->module);
 317
 318    if (!lp_build_init())
 319       return FALSE;
 320
 321    gallivm->context = context;
 322
 323    if (!gallivm->context)
 324       goto fail;
 325
 326    gallivm->module_name = NULL;
 327    if (name) {
 328       size_t size = strlen(name) + 1;
 329       gallivm->module_name = MALLOC(size);
 330       if (gallivm->module_name) {
 331          memcpy(gallivm->module_name, name, size);
 332       }
 333    }
 334
 335    gallivm->module = LLVMModuleCreateWithNameInContext(name,
 336                                                        gallivm->context);
 337    if (!gallivm->module)
 338       goto fail;
 339
 340    gallivm->builder = LLVMCreateBuilderInContext(gallivm->context);
 341    if (!gallivm->builder)
 342       goto fail;
 343
 344    gallivm->memorymgr = lp_get_default_memory_manager();
 345    if (!gallivm->memorymgr)
 346       goto fail;
 347
 348    /* FIXME: MC-JIT only allows compiling one module at a time, and it must be
 349     * complete when MC-JIT is created. So defer the MC-JIT engine creation for
 350     * now.
 351     */
 352
 353    /*
 354     * MC-JIT engine compiles the module immediately on creation, so we can't
 355     * obtain the target data from it.  Instead we create a target data layout
 356     * from a string.
 357     *
 358     * The produced layout strings are not precisely the same, but should make
 359     * no difference for the kind of optimization passes we run.
 360     *
 361     * For reference this is the layout string on x64:
 362     *
 363     *   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
 364     *
 365     * See also:
 366     * - http://llvm.org/docs/LangRef.html#datalayout
 367     */
 368
 369    {
 370       const unsigned pointer_size = 8 * sizeof(void *);
 371       char layout[512];
 372       snprintf(layout, sizeof layout, "%c-p:%u:%u:%u-i64:64:64-a0:0:%u-s0:%u:%u",
 373 #if UTIL_ARCH_LITTLE_ENDIAN
 374                     'e', // little endian
 375 #else
 376                     'E', // big endian
 377 #endif
 378                     pointer_size, pointer_size, pointer_size, // pointer size, abi alignment, preferred alignment
 379                     pointer_size, // aggregate preferred alignment
 380                     pointer_size, pointer_size); // stack objects abi alignment, preferred alignment
 381
 382       gallivm->target = LLVMCreateTargetData(layout);
 383       if (!gallivm->target) {
 384          return FALSE;
 385       }
 386    }
 387
 388    if (!create_pass_manager(gallivm))
 389       goto fail;
 390
 391    return TRUE;
 392
 393 fail:
 394    gallivm_free_ir(gallivm);
 395    gallivm_free_code(gallivm);
 396    return FALSE;
 397 }
 398
 399
 400 boolean
 401 lp_build_init(void)
 402 {
 403    if (gallivm_initialized)
 404       return TRUE;
 405
 406
 407    /* LLVMLinkIn* are no-ops at runtime.  They just ensure the respective
 408     * component is linked at buildtime, which is sufficient for its static
 409     * constructors to be called at load time.
 410     */
 411    LLVMLinkInMCJIT();
 412
 413 #ifdef DEBUG
 414    gallivm_debug = debug_get_option_gallivm_debug();
 415 #endif
 416
 417    gallivm_perf = debug_get_flags_option("GALLIVM_PERF", lp_bld_perf_flags, 0 );
 418
 419    lp_set_target_options();
 420
 421    util_cpu_detect();
 422
 423    /* For simulating less capable machines */
 424 #ifdef DEBUG
 425    if (debug_get_bool_option("LP_FORCE_SSE2", FALSE)) {
 426       assert(util_cpu_caps.has_sse2);
 427       util_cpu_caps.has_sse3 = 0;
 428       util_cpu_caps.has_ssse3 = 0;
 429       util_cpu_caps.has_sse4_1 = 0;
 430       util_cpu_caps.has_sse4_2 = 0;
 431       util_cpu_caps.has_avx = 0;
 432       util_cpu_caps.has_avx2 = 0;
 433       util_cpu_caps.has_f16c = 0;
 434       util_cpu_caps.has_fma = 0;
 435    }
 436 #endif
 437
 438    if (util_cpu_caps.has_avx2 || util_cpu_caps.has_avx) {
 439       lp_native_vector_width = 256;
 440    } else {
 441       /* Leave it at 128, even when no SIMD extensions are available.
 442        * Really needs to be a multiple of 128 so can fit 4 floats.
 443        */
 444       lp_native_vector_width = 128;
 445    }
 446
 447    lp_native_vector_width = debug_get_num_option("LP_NATIVE_VECTOR_WIDTH",
 448                                                  lp_native_vector_width);
 449
 450 #if LLVM_VERSION_MAJOR < 4
 451    if (lp_native_vector_width <= 128) {
 452       /* Hide AVX support, as often LLVM AVX intrinsics are only guarded by
 453        * "util_cpu_caps.has_avx" predicate, and lack the
 454        * "lp_native_vector_width > 128" predicate. And also to ensure a more
 455        * consistent behavior, allowing one to test SSE2 on AVX machines.
 456        * XXX: should not play games with util_cpu_caps directly as it might
 457        * get used for other things outside llvm too.
 458        */
 459       util_cpu_caps.has_avx = 0;
 460       util_cpu_caps.has_avx2 = 0;
 461       util_cpu_caps.has_f16c = 0;
 462       util_cpu_caps.has_fma = 0;
 463    }
 464 #endif
 465
 466 #ifdef PIPE_ARCH_PPC_64
 467    /* Set the NJ bit in VSCR to 0 so denormalized values are handled as
 468     * specified by IEEE standard (PowerISA 2.06 - Section 6.3). This guarantees
 469     * that some rounding and half-float to float handling does not round
 470     * incorrectly to 0.
 471     * XXX: should eventually follow same logic on all platforms.
 472     * Right now denorms get explicitly disabled (but elsewhere) for x86,
 473     * whereas ppc64 explicitly enables them...
 474     */
 475    if (util_cpu_caps.has_altivec) {
 476       unsigned short mask[] = { 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
 477                                 0xFFFF, 0xFFFF, 0xFFFE, 0xFFFF };
 478       __asm (
 479         "mfvscr %%v1\n"
 480         "vand   %0,%%v1,%0\n"
 481         "mtvscr %0"
 482         :
 483         : "r" (*mask)
 484       );
 485    }
 486 #endif
 487
 488    gallivm_initialized = TRUE;
 489
 490    return TRUE;
 491 }
 492
 493
 494
 495 /**
 496  * Create a new gallivm_state object.
 497  */
 498 struct gallivm_state *
 499 gallivm_create(const char *name, LLVMContextRef context)
 500 {
 501    struct gallivm_state *gallivm;
 502
 503    gallivm = CALLOC_STRUCT(gallivm_state);
 504    if (gallivm) {
 505       if (!init_gallivm_state(gallivm, name, context)) {
 506          FREE(gallivm);
 507          gallivm = NULL;
 508       }
 509    }
 510
 511    assert(gallivm != NULL);
 512    return gallivm;
 513 }
 514
 515
 516 /**
 517  * Destroy a gallivm_state object.
 518  */
 519 void
 520 gallivm_destroy(struct gallivm_state *gallivm)
 521 {
 522    gallivm_free_ir(gallivm);
 523    gallivm_free_code(gallivm);
 524    FREE(gallivm);
 525 }
 526
 527
 528 /**
 529  * Validate a function.
 530  * Verification is only done with debug builds.
 531  */
 532 void
 533 gallivm_verify_function(struct gallivm_state *gallivm,
 534                         LLVMValueRef func)
 535 {
 536    /* Verify the LLVM IR.  If invalid, dump and abort */
 537 #ifdef DEBUG
 538    if (LLVMVerifyFunction(func, LLVMPrintMessageAction)) {
 539       lp_debug_dump_value(func);
 540       assert(0);
 541       return;
 542    }
 543 #endif
 544
 545    if (gallivm_debug & GALLIVM_DEBUG_IR) {
 546       /* Print the LLVM IR to stderr */
 547       lp_debug_dump_value(func);
 548       debug_printf("\n");
 549    }
 550 }
 551
 552
 553 /**
 554  * Compile a module.
 555  * This does IR optimization on all functions in the module.
 556  */
 557 void
 558 gallivm_compile_module(struct gallivm_state *gallivm)
 559 {
 560    LLVMValueRef func;
 561    int64_t time_begin = 0;
 562
 563    assert(!gallivm->compiled);
 564
 565    if (gallivm->builder) {
 566       LLVMDisposeBuilder(gallivm->builder);
 567       gallivm->builder = NULL;
 568    }
 569
 570    /* Dump bitcode to a file */
 571    if (gallivm_debug & GALLIVM_DEBUG_DUMP_BC) {
 572       char filename[256];
 573       assert(gallivm->module_name);
 574       snprintf(filename, sizeof(filename), "ir_%s.bc", gallivm->module_name);
 575       LLVMWriteBitcodeToFile(gallivm->module, filename);
 576       debug_printf("%s written\n", filename);
 577       debug_printf("Invoke as \"opt %s %s | llc -O%d %s%s\"\n",
 578                    gallivm_debug & GALLIVM_PERF_NO_OPT ? "-mem2reg" :
 579                    "-sroa -early-cse -simplifycfg -reassociate "
 580                    "-mem2reg -constprop -instcombine -gvn",
 581                    filename, gallivm_debug & GALLIVM_PERF_NO_OPT ? 0 : 2,
 582                    "[-mcpu=<-mcpu option>] ",
 583                    "[-mattr=<-mattr option(s)>]");
 584    }
 585
 586    if (gallivm_debug & GALLIVM_DEBUG_PERF)
 587       time_begin = os_time_get();
 588
 589 #if GALLIVM_HAVE_CORO
 590    LLVMRunPassManager(gallivm->cgpassmgr, gallivm->module);
 591 #endif
 592    /* Run optimization passes */
 593    LLVMInitializeFunctionPassManager(gallivm->passmgr);
 594    func = LLVMGetFirstFunction(gallivm->module);
 595    while (func) {
 596       if (0) {
 597          debug_printf("optimizing func %s...\n", LLVMGetValueName(func));
 598       }
 599
 600    /* Disable frame pointer omission on debug/profile builds */
 601    /* XXX: And workaround http://llvm.org/PR21435 */
 602 #if defined(DEBUG) || defined(PROFILE) || defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64)
 603       LLVMAddTargetDependentFunctionAttr(func, "no-frame-pointer-elim", "true");
 604       LLVMAddTargetDependentFunctionAttr(func, "no-frame-pointer-elim-non-leaf", "true");
 605 #endif
 606
 607       LLVMRunFunctionPassManager(gallivm->passmgr, func);
 608       func = LLVMGetNextFunction(func);
 609    }
 610    LLVMFinalizeFunctionPassManager(gallivm->passmgr);
 611
 612    if (gallivm_debug & GALLIVM_DEBUG_PERF) {
 613       int64_t time_end = os_time_get();
 614       int time_msec = (int)((time_end - time_begin) / 1000);
 615       assert(gallivm->module_name);
 616       debug_printf("optimizing module %s took %d msec\n",
 617                    gallivm->module_name, time_msec);
 618    }
 619
 620    /* Setting the module's DataLayout to an empty string will cause the
 621     * ExecutionEngine to copy to the DataLayout string from its target machine
 622     * to the module.  As of LLVM 3.8 the module and the execution engine are
 623     * required to have the same DataLayout.
 624     *
 625     * We must make sure we do this after running the optimization passes,
 626     * because those passes need a correct datalayout string.  For example, if
 627     * those optimization passes see an empty datalayout, they will assume this
 628     * is a little endian target and will do optimizations that break big endian
 629     * machines.
 630     *
 631     * TODO: This is just a temporary work-around.  The correct solution is for
 632     * gallivm_init_state() to create a TargetMachine and pull the DataLayout
 633     * from there.  Currently, the TargetMachine used by llvmpipe is being
 634     * implicitly created by the EngineBuilder in
 635     * lp_build_create_jit_compiler_for_module()
 636     */
 637    LLVMSetDataLayout(gallivm->module, "");
 638    assert(!gallivm->engine);
 639    if (!init_gallivm_engine(gallivm)) {
 640       assert(0);
 641    }
 642    assert(gallivm->engine);
 643
 644    ++gallivm->compiled;
 645
 646    if (gallivm_debug & GALLIVM_DEBUG_ASM) {
 647       LLVMValueRef llvm_func = LLVMGetFirstFunction(gallivm->module);
 648
 649       while (llvm_func) {
 650          /*
 651           * Need to filter out functions which don't have an implementation,
 652           * such as the intrinsics. May not be sufficient in case of IPO?
 653           * LLVMGetPointerToGlobal() will abort otherwise.
 654           */
 655          if (!LLVMIsDeclaration(llvm_func)) {
 656             void *func_code = LLVMGetPointerToGlobal(gallivm->engine, llvm_func);
 657             lp_disassemble(llvm_func, func_code);
 658          }
 659          llvm_func = LLVMGetNextFunction(llvm_func);
 660       }
 661    }
 662
 663 #if defined(PROFILE)
 664    {
 665       LLVMValueRef llvm_func = LLVMGetFirstFunction(gallivm->module);
 666
 667       while (llvm_func) {
 668          if (!LLVMIsDeclaration(llvm_func)) {
 669             void *func_code = LLVMGetPointerToGlobal(gallivm->engine, llvm_func);
 670             lp_profile(llvm_func, func_code);
 671          }
 672          llvm_func = LLVMGetNextFunction(llvm_func);
 673       }
 674    }
 675 #endif
 676 }
 677
 678
 679
 680 func_pointer
 681 gallivm_jit_function(struct gallivm_state *gallivm,
 682                      LLVMValueRef func)
 683 {
 684    void *code;
 685    func_pointer jit_func;
 686    int64_t time_begin = 0;
 687
 688    assert(gallivm->compiled);
 689    assert(gallivm->engine);
 690
 691    if (gallivm_debug & GALLIVM_DEBUG_PERF)
 692       time_begin = os_time_get();
 693
 694    code = LLVMGetPointerToGlobal(gallivm->engine, func);
 695    assert(code);
 696    jit_func = pointer_to_func(code);
 697
 698    if (gallivm_debug & GALLIVM_DEBUG_PERF) {
 699       int64_t time_end = os_time_get();
 700       int time_msec = (int)(time_end - time_begin) / 1000;
 701       debug_printf("   jitting func %s took %d msec\n",
 702                    LLVMGetValueName(func), time_msec);
 703    }
 704
 705    return jit_func;
 706 }