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