src/gallium/auxiliary/gallivm/lp_bld_misc.cpp

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  27
  28
  29 #ifndef __STDC_LIMIT_MACROS
  30 #define __STDC_LIMIT_MACROS
  31 #endif
  32
  33 #ifndef __STDC_CONSTANT_MACROS
  34 #define __STDC_CONSTANT_MACROS
  35 #endif
  36
  37 #include <stddef.h>
  38
  39 #include <llvm-c/Core.h>
  40 #include <llvm-c/ExecutionEngine.h>
  41 #include <llvm/Target/TargetOptions.h>
  42 #include <llvm/ExecutionEngine/ExecutionEngine.h>
  43 #include <llvm/ExecutionEngine/JITEventListener.h>
  44 #include <llvm/Support/CommandLine.h>
  45 #include <llvm/Support/PrettyStackTrace.h>
  46
  47 #include "pipe/p_config.h"
  48 #include "util/u_debug.h"
  49
  50
  51 /**
  52  * Register the engine with oprofile.
  53  *
  54  * This allows to see the LLVM IR function names in oprofile output.
  55  *
  56  * To actually work LLVM needs to be built with the --with-oprofile configure
  57  * option.
  58  *
  59  * Also a oprofile:oprofile user:group is necessary. Which is not created by
  60  * default on some distributions.
  61  */
  62 extern "C" void
  63 lp_register_oprofile_jit_event_listener(LLVMExecutionEngineRef EE)
  64 {
  65    llvm::unwrap(EE)->RegisterJITEventListener(llvm::createOProfileJITEventListener());
  66 }
  67
  68
  69 extern "C" void
  70 lp_set_target_options(void)
  71 {
  72 #if HAVE_LLVM <= 0x0300
  73 #if defined(DEBUG)
  74 #if HAVE_LLVM >= 0x0207
  75    llvm::JITEmitDebugInfo = true;
  76 #endif
  77 #endif
  78
  79    /*
  80     * LLVM revision 123367 switched the default stack alignment to 16 bytes on
  81     * Linux (and several other Unices in later revisions), to match recent gcc
  82     * versions.
  83     *
  84     * However our drivers can be loaded by old binary applications, still
  85     * maintaining a 4 bytes stack alignment.  Therefore we must tell LLVM here
  86     * to only assume a 4 bytes alignment for backwards compatibility.
  87     */
  88 #if defined(PIPE_ARCH_X86)
  89 #if HAVE_LLVM >= 0x0300
  90    llvm::StackAlignmentOverride = 4;
  91 #else
  92    llvm::StackAlignment = 4;
  93 #endif
  94 #endif
  95
  96 #if defined(DEBUG) || defined(PROFILE)
  97    llvm::NoFramePointerElim = true;
  98 #endif
  99
 100    llvm::NoExcessFPPrecision = false;
 101
 102    /* XXX: Investigate this */
 103 #if 0
 104    llvm::UnsafeFPMath = true;
 105 #endif
 106 #endif  /* HAVE_LLVM <= 0x0300 */
 107
 108 #if HAVE_LLVM < 0x0209
 109    /*
 110     * LLVM will generate MMX instructions for vectors <= 64 bits, leading to
 111     * innefficient code, and in 32bit systems, to the corruption of the FPU
 112     * stack given that it expects the user to generate the EMMS instructions.
 113     *
 114     * See also:
 115     * - http://llvm.org/bugs/show_bug.cgi?id=3287
 116     * - http://l4.me.uk/post/2009/06/07/llvm-wrinkle-3-configuration-what-configuration/
 117     *
 118     * The -disable-mmx global option can be specified only once  since we
 119     * dynamically link against LLVM it will reside in a separate shared object,
 120     * which may or not be delete when this shared object is, so we use the
 121     * llvm::DisablePrettyStackTrace variable (which we set below and should
 122     * reside in the same shared library) to determine whether the -disable-mmx
 123     * option has been set or not.
 124     *
 125     * Thankfully this ugly hack is not necessary on LLVM 2.9 onwards.
 126     */
 127    if (!llvm::DisablePrettyStackTrace) {
 128       static boolean first = TRUE;
 129       static const char* options[] = {
 130          "prog",
 131          "-disable-mmx"
 132       };
 133       assert(first);
 134       llvm::cl::ParseCommandLineOptions(2, const_cast<char**>(options));
 135       first = FALSE;
 136    }
 137 #endif
 138
 139    /*
 140     * By default LLVM adds a signal handler to output a pretty stack trace.
 141     * This signal handler is never removed, causing problems when unloading the
 142     * shared object where the gallium driver resides.
 143     */
 144    llvm::DisablePrettyStackTrace = true;
 145 }
 146
 147
 148 extern "C" void
 149 lp_func_delete_body(LLVMValueRef FF)
 150 {
 151    llvm::Function *func = llvm::unwrap<llvm::Function>(FF);
 152    func->deleteBody();
 153 }
 154
 155
 156 extern "C"
 157 LLVMValueRef
 158 lp_build_load_volatile(LLVMBuilderRef B, LLVMValueRef PointerVal,
 159                        const char *Name)
 160 {
 161    return llvm::wrap(llvm::unwrap(B)->CreateLoad(llvm::unwrap(PointerVal), true, Name));
 162 }
 163