mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-23 01:30:19 +00:00
92ffb676af
widespread glibc bugs. The glibc implementation of exp10 has a very serious precision bug in version 2.15 (and older versions). This is still very widely used (the current Ubuntu LTS for example uses it) and so it isn't reasonable to make transforms that produce these functions. This fixes many miscompiles introduced when we started transforming pow(10.0, ...) into exp10, and it may have fixed other latent miscompiles where exp10 provided sufficient precision but exp10f did not. This is all really horrible. The primary bug has been fixed for over a year and glibc 2.18 works correctly for the test cases I have, but it will be 2017 before the LTS using 2.15 is no longer supported by Ubuntu (and thus reasonable for folks to be relying on). =[ We're either going to need to live without these optimizations, or find a way to switch behavior more dynamically than using simply the fact that the OS is "Linux". To make matters worse, there appears to be significant testing and fixing of numerous other bugs in the exp10 family of functions right now in glibc. While those haven't been causing problems I've seen in the wild, it gives me concerns that we may need to wait until an even later release of glibc before we can reliably transform code into exp10. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198093 91177308-0d34-0410-b5e6-96231b3b80d8
730 lines
20 KiB
C++
730 lines
20 KiB
C++
//===-- TargetLibraryInfo.cpp - Runtime library information ----------------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the TargetLibraryInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetLibraryInfo.h"
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#include "llvm/ADT/Triple.h"
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using namespace llvm;
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// Register the default implementation.
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INITIALIZE_PASS(TargetLibraryInfo, "targetlibinfo",
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"Target Library Information", false, true)
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char TargetLibraryInfo::ID = 0;
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void TargetLibraryInfo::anchor() { }
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const char* TargetLibraryInfo::StandardNames[LibFunc::NumLibFuncs] =
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{
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"_IO_getc",
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"_IO_putc",
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"_ZdaPv",
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"_ZdaPvRKSt9nothrow_t",
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"_ZdlPv",
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"_ZdlPvRKSt9nothrow_t",
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"_Znaj",
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"_ZnajRKSt9nothrow_t",
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"_Znam",
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"_ZnamRKSt9nothrow_t",
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"_Znwj",
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"_ZnwjRKSt9nothrow_t",
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"_Znwm",
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"_ZnwmRKSt9nothrow_t",
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"__cospi",
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"__cospif",
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"__cxa_atexit",
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"__cxa_guard_abort",
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"__cxa_guard_acquire",
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"__cxa_guard_release",
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"__isoc99_scanf",
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"__isoc99_sscanf",
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"__memcpy_chk",
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"__sincospi_stret",
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"__sincospi_stretf",
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"__sinpi",
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"__sinpif",
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"__sqrt_finite",
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"__sqrtf_finite",
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"__sqrtl_finite",
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"__strdup",
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"__strndup",
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"__strtok_r",
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"abs",
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"access",
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"acos",
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"acosf",
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"acosh",
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"acoshf",
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"acoshl",
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"acosl",
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"asin",
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"asinf",
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"asinh",
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"asinhf",
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"asinhl",
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"asinl",
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"atan",
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"atan2",
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"atan2f",
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"atan2l",
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"atanf",
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"atanh",
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"atanhf",
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"atanhl",
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"atanl",
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"atof",
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"atoi",
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"atol",
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"atoll",
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"bcmp",
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"bcopy",
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"bzero",
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"calloc",
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"cbrt",
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"cbrtf",
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"cbrtl",
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"ceil",
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"ceilf",
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"ceill",
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"chmod",
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"chown",
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"clearerr",
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"closedir",
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"copysign",
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"copysignf",
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"copysignl",
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"cos",
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"cosf",
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"cosh",
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"coshf",
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"coshl",
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"cosl",
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"ctermid",
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"exp",
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"exp10",
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"exp10f",
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"exp10l",
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"exp2",
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"exp2f",
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"exp2l",
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"expf",
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"expl",
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"expm1",
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"expm1f",
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"expm1l",
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"fabs",
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"fabsf",
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"fabsl",
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"fclose",
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"fdopen",
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"feof",
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"ferror",
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"fflush",
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"ffs",
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"ffsl",
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"ffsll",
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"fgetc",
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"fgetpos",
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"fgets",
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"fileno",
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"fiprintf",
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"flockfile",
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"floor",
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"floorf",
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"floorl",
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"fmax",
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"fmaxf",
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"fmaxl",
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"fmin",
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"fminf",
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"fminl",
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"fmod",
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"fmodf",
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"fmodl",
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"fopen",
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"fopen64",
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"fprintf",
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"fputc",
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"fputs",
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"fread",
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"free",
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"frexp",
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"frexpf",
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"frexpl",
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"fscanf",
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"fseek",
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"fseeko",
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"fseeko64",
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"fsetpos",
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"fstat",
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"fstat64",
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"fstatvfs",
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"fstatvfs64",
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"ftell",
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"ftello",
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"ftello64",
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"ftrylockfile",
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"funlockfile",
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"fwrite",
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"getc",
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"getc_unlocked",
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"getchar",
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"getenv",
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"getitimer",
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"getlogin_r",
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"getpwnam",
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"gets",
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"gettimeofday",
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"htonl",
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"htons",
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"iprintf",
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"isascii",
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"isdigit",
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"labs",
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"lchown",
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"llabs",
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"log",
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"log10",
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"log10f",
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"log10l",
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"log1p",
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"log1pf",
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"log1pl",
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"log2",
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"log2f",
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"log2l",
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"logb",
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"logbf",
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"logbl",
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"logf",
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"logl",
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"lstat",
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"lstat64",
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"malloc",
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"memalign",
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"memccpy",
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"memchr",
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"memcmp",
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"memcpy",
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"memmove",
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"memrchr",
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"memset",
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"memset_pattern16",
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"mkdir",
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"mktime",
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"modf",
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"modff",
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"modfl",
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"nearbyint",
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"nearbyintf",
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"nearbyintl",
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"ntohl",
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"ntohs",
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"open",
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"open64",
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"opendir",
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"pclose",
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"perror",
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"popen",
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"posix_memalign",
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"pow",
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"powf",
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"powl",
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"pread",
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"printf",
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"putc",
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"putchar",
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"puts",
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"pwrite",
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"qsort",
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"read",
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"readlink",
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"realloc",
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"reallocf",
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"realpath",
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"remove",
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"rename",
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"rewind",
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"rint",
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"rintf",
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"rintl",
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"rmdir",
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"round",
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"roundf",
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"roundl",
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"scanf",
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"setbuf",
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"setitimer",
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"setvbuf",
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"sin",
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"sinf",
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"sinh",
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"sinhf",
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"sinhl",
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"sinl",
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"siprintf",
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"snprintf",
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"sprintf",
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"sqrt",
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"sqrtf",
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"sqrtl",
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"sscanf",
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"stat",
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"stat64",
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"statvfs",
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"statvfs64",
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"stpcpy",
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"stpncpy",
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"strcasecmp",
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"strcat",
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"strchr",
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"strcmp",
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"strcoll",
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"strcpy",
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"strcspn",
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"strdup",
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"strlen",
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"strncasecmp",
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"strncat",
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"strncmp",
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"strncpy",
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"strndup",
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"strnlen",
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"strpbrk",
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"strrchr",
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"strspn",
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"strstr",
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"strtod",
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"strtof",
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"strtok",
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"strtok_r",
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"strtol",
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"strtold",
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"strtoll",
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"strtoul",
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"strtoull",
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"strxfrm",
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"system",
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"tan",
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"tanf",
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"tanh",
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"tanhf",
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"tanhl",
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"tanl",
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"times",
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"tmpfile",
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"tmpfile64",
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"toascii",
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"trunc",
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"truncf",
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"truncl",
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"uname",
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"ungetc",
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"unlink",
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"unsetenv",
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"utime",
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"utimes",
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"valloc",
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"vfprintf",
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"vfscanf",
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"vprintf",
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"vscanf",
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"vsnprintf",
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"vsprintf",
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"vsscanf",
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"write"
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};
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static bool hasSinCosPiStret(const Triple &T) {
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// Only Darwin variants have _stret versions of combined trig functions.
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if (!T.isMacOSX() && T.getOS() != Triple::IOS)
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return false;
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// The ABI is rather complicated on x86, so don't do anything special there.
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if (T.getArch() == Triple::x86)
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return false;
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if (T.isMacOSX() && T.isMacOSXVersionLT(10, 9))
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return false;
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if (T.getOS() == Triple::IOS && T.isOSVersionLT(7, 0))
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return false;
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return true;
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}
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/// initialize - Initialize the set of available library functions based on the
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/// specified target triple. This should be carefully written so that a missing
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/// target triple gets a sane set of defaults.
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static void initialize(TargetLibraryInfo &TLI, const Triple &T,
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const char **StandardNames) {
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initializeTargetLibraryInfoPass(*PassRegistry::getPassRegistry());
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#ifndef NDEBUG
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// Verify that the StandardNames array is in alphabetical order.
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for (unsigned F = 1; F < LibFunc::NumLibFuncs; ++F) {
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if (strcmp(StandardNames[F-1], StandardNames[F]) >= 0)
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llvm_unreachable("TargetLibraryInfo function names must be sorted");
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}
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#endif // !NDEBUG
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// memset_pattern16 is only available on iOS 3.0 and Mac OS/X 10.5 and later.
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if (T.isMacOSX()) {
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if (T.isMacOSXVersionLT(10, 5))
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TLI.setUnavailable(LibFunc::memset_pattern16);
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} else if (T.isiOS()) {
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if (T.isOSVersionLT(3, 0))
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TLI.setUnavailable(LibFunc::memset_pattern16);
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} else {
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TLI.setUnavailable(LibFunc::memset_pattern16);
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}
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if (!hasSinCosPiStret(T)) {
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TLI.setUnavailable(LibFunc::sinpi);
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TLI.setUnavailable(LibFunc::sinpif);
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TLI.setUnavailable(LibFunc::cospi);
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TLI.setUnavailable(LibFunc::cospif);
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TLI.setUnavailable(LibFunc::sincospi_stret);
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TLI.setUnavailable(LibFunc::sincospi_stretf);
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}
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if (T.isMacOSX() && T.getArch() == Triple::x86 &&
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!T.isMacOSXVersionLT(10, 7)) {
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// x86-32 OSX has a scheme where fwrite and fputs (and some other functions
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// we don't care about) have two versions; on recent OSX, the one we want
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// has a $UNIX2003 suffix. The two implementations are identical except
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// for the return value in some edge cases. However, we don't want to
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// generate code that depends on the old symbols.
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TLI.setAvailableWithName(LibFunc::fwrite, "fwrite$UNIX2003");
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TLI.setAvailableWithName(LibFunc::fputs, "fputs$UNIX2003");
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}
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// iprintf and friends are only available on XCore and TCE.
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if (T.getArch() != Triple::xcore && T.getArch() != Triple::tce) {
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TLI.setUnavailable(LibFunc::iprintf);
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TLI.setUnavailable(LibFunc::siprintf);
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TLI.setUnavailable(LibFunc::fiprintf);
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}
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if (T.getOS() == Triple::Win32) {
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// Win32 does not support long double
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TLI.setUnavailable(LibFunc::acosl);
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TLI.setUnavailable(LibFunc::asinl);
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TLI.setUnavailable(LibFunc::atanl);
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TLI.setUnavailable(LibFunc::atan2l);
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TLI.setUnavailable(LibFunc::ceill);
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TLI.setUnavailable(LibFunc::copysignl);
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TLI.setUnavailable(LibFunc::cosl);
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TLI.setUnavailable(LibFunc::coshl);
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TLI.setUnavailable(LibFunc::expl);
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TLI.setUnavailable(LibFunc::fabsf); // Win32 and Win64 both lack fabsf
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TLI.setUnavailable(LibFunc::fabsl);
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TLI.setUnavailable(LibFunc::floorl);
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TLI.setUnavailable(LibFunc::fmaxl);
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TLI.setUnavailable(LibFunc::fminl);
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TLI.setUnavailable(LibFunc::fmodl);
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TLI.setUnavailable(LibFunc::frexpl);
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TLI.setUnavailable(LibFunc::logl);
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TLI.setUnavailable(LibFunc::modfl);
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TLI.setUnavailable(LibFunc::powl);
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TLI.setUnavailable(LibFunc::sinl);
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TLI.setUnavailable(LibFunc::sinhl);
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TLI.setUnavailable(LibFunc::sqrtl);
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TLI.setUnavailable(LibFunc::tanl);
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TLI.setUnavailable(LibFunc::tanhl);
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// Win32 only has C89 math
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TLI.setUnavailable(LibFunc::acosh);
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TLI.setUnavailable(LibFunc::acoshf);
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TLI.setUnavailable(LibFunc::acoshl);
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TLI.setUnavailable(LibFunc::asinh);
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TLI.setUnavailable(LibFunc::asinhf);
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TLI.setUnavailable(LibFunc::asinhl);
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TLI.setUnavailable(LibFunc::atanh);
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TLI.setUnavailable(LibFunc::atanhf);
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TLI.setUnavailable(LibFunc::atanhl);
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TLI.setUnavailable(LibFunc::cbrt);
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TLI.setUnavailable(LibFunc::cbrtf);
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TLI.setUnavailable(LibFunc::cbrtl);
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TLI.setUnavailable(LibFunc::exp2);
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TLI.setUnavailable(LibFunc::exp2f);
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TLI.setUnavailable(LibFunc::exp2l);
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TLI.setUnavailable(LibFunc::expm1);
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TLI.setUnavailable(LibFunc::expm1f);
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TLI.setUnavailable(LibFunc::expm1l);
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TLI.setUnavailable(LibFunc::log2);
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TLI.setUnavailable(LibFunc::log2f);
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TLI.setUnavailable(LibFunc::log2l);
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TLI.setUnavailable(LibFunc::log1p);
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TLI.setUnavailable(LibFunc::log1pf);
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TLI.setUnavailable(LibFunc::log1pl);
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TLI.setUnavailable(LibFunc::logb);
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TLI.setUnavailable(LibFunc::logbf);
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TLI.setUnavailable(LibFunc::logbl);
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TLI.setUnavailable(LibFunc::nearbyint);
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TLI.setUnavailable(LibFunc::nearbyintf);
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TLI.setUnavailable(LibFunc::nearbyintl);
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TLI.setUnavailable(LibFunc::rint);
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TLI.setUnavailable(LibFunc::rintf);
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TLI.setUnavailable(LibFunc::rintl);
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TLI.setUnavailable(LibFunc::round);
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TLI.setUnavailable(LibFunc::roundf);
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TLI.setUnavailable(LibFunc::roundl);
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TLI.setUnavailable(LibFunc::trunc);
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TLI.setUnavailable(LibFunc::truncf);
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TLI.setUnavailable(LibFunc::truncl);
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// Win32 provides some C99 math with mangled names
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TLI.setAvailableWithName(LibFunc::copysign, "_copysign");
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if (T.getArch() == Triple::x86) {
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// Win32 on x86 implements single-precision math functions as macros
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TLI.setUnavailable(LibFunc::acosf);
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TLI.setUnavailable(LibFunc::asinf);
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TLI.setUnavailable(LibFunc::atanf);
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TLI.setUnavailable(LibFunc::atan2f);
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TLI.setUnavailable(LibFunc::ceilf);
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TLI.setUnavailable(LibFunc::copysignf);
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TLI.setUnavailable(LibFunc::cosf);
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TLI.setUnavailable(LibFunc::coshf);
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TLI.setUnavailable(LibFunc::expf);
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TLI.setUnavailable(LibFunc::floorf);
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TLI.setUnavailable(LibFunc::fminf);
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TLI.setUnavailable(LibFunc::fmaxf);
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TLI.setUnavailable(LibFunc::fmodf);
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TLI.setUnavailable(LibFunc::logf);
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TLI.setUnavailable(LibFunc::powf);
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TLI.setUnavailable(LibFunc::sinf);
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TLI.setUnavailable(LibFunc::sinhf);
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TLI.setUnavailable(LibFunc::sqrtf);
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TLI.setUnavailable(LibFunc::tanf);
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TLI.setUnavailable(LibFunc::tanhf);
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}
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// Win32 does *not* provide provide these functions, but they are
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// generally available on POSIX-compliant systems:
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TLI.setUnavailable(LibFunc::access);
|
|
TLI.setUnavailable(LibFunc::bcmp);
|
|
TLI.setUnavailable(LibFunc::bcopy);
|
|
TLI.setUnavailable(LibFunc::bzero);
|
|
TLI.setUnavailable(LibFunc::chmod);
|
|
TLI.setUnavailable(LibFunc::chown);
|
|
TLI.setUnavailable(LibFunc::closedir);
|
|
TLI.setUnavailable(LibFunc::ctermid);
|
|
TLI.setUnavailable(LibFunc::fdopen);
|
|
TLI.setUnavailable(LibFunc::ffs);
|
|
TLI.setUnavailable(LibFunc::fileno);
|
|
TLI.setUnavailable(LibFunc::flockfile);
|
|
TLI.setUnavailable(LibFunc::fseeko);
|
|
TLI.setUnavailable(LibFunc::fstat);
|
|
TLI.setUnavailable(LibFunc::fstatvfs);
|
|
TLI.setUnavailable(LibFunc::ftello);
|
|
TLI.setUnavailable(LibFunc::ftrylockfile);
|
|
TLI.setUnavailable(LibFunc::funlockfile);
|
|
TLI.setUnavailable(LibFunc::getc_unlocked);
|
|
TLI.setUnavailable(LibFunc::getitimer);
|
|
TLI.setUnavailable(LibFunc::getlogin_r);
|
|
TLI.setUnavailable(LibFunc::getpwnam);
|
|
TLI.setUnavailable(LibFunc::gettimeofday);
|
|
TLI.setUnavailable(LibFunc::htonl);
|
|
TLI.setUnavailable(LibFunc::htons);
|
|
TLI.setUnavailable(LibFunc::lchown);
|
|
TLI.setUnavailable(LibFunc::lstat);
|
|
TLI.setUnavailable(LibFunc::memccpy);
|
|
TLI.setUnavailable(LibFunc::mkdir);
|
|
TLI.setUnavailable(LibFunc::ntohl);
|
|
TLI.setUnavailable(LibFunc::ntohs);
|
|
TLI.setUnavailable(LibFunc::open);
|
|
TLI.setUnavailable(LibFunc::opendir);
|
|
TLI.setUnavailable(LibFunc::pclose);
|
|
TLI.setUnavailable(LibFunc::popen);
|
|
TLI.setUnavailable(LibFunc::pread);
|
|
TLI.setUnavailable(LibFunc::pwrite);
|
|
TLI.setUnavailable(LibFunc::read);
|
|
TLI.setUnavailable(LibFunc::readlink);
|
|
TLI.setUnavailable(LibFunc::realpath);
|
|
TLI.setUnavailable(LibFunc::rmdir);
|
|
TLI.setUnavailable(LibFunc::setitimer);
|
|
TLI.setUnavailable(LibFunc::stat);
|
|
TLI.setUnavailable(LibFunc::statvfs);
|
|
TLI.setUnavailable(LibFunc::stpcpy);
|
|
TLI.setUnavailable(LibFunc::stpncpy);
|
|
TLI.setUnavailable(LibFunc::strcasecmp);
|
|
TLI.setUnavailable(LibFunc::strncasecmp);
|
|
TLI.setUnavailable(LibFunc::times);
|
|
TLI.setUnavailable(LibFunc::uname);
|
|
TLI.setUnavailable(LibFunc::unlink);
|
|
TLI.setUnavailable(LibFunc::unsetenv);
|
|
TLI.setUnavailable(LibFunc::utime);
|
|
TLI.setUnavailable(LibFunc::utimes);
|
|
TLI.setUnavailable(LibFunc::write);
|
|
|
|
// Win32 does *not* provide provide these functions, but they are
|
|
// specified by C99:
|
|
TLI.setUnavailable(LibFunc::atoll);
|
|
TLI.setUnavailable(LibFunc::frexpf);
|
|
TLI.setUnavailable(LibFunc::llabs);
|
|
}
|
|
|
|
switch (T.getOS()) {
|
|
case Triple::MacOSX:
|
|
// exp10 and exp10f are not available on OS X until 10.9 and iOS until 7.0
|
|
// and their names are __exp10 and __exp10f. exp10l is not available on
|
|
// OS X or iOS.
|
|
TLI.setUnavailable(LibFunc::exp10l);
|
|
if (T.isMacOSXVersionLT(10, 9)) {
|
|
TLI.setUnavailable(LibFunc::exp10);
|
|
TLI.setUnavailable(LibFunc::exp10f);
|
|
} else {
|
|
TLI.setAvailableWithName(LibFunc::exp10, "__exp10");
|
|
TLI.setAvailableWithName(LibFunc::exp10f, "__exp10f");
|
|
}
|
|
break;
|
|
case Triple::IOS:
|
|
TLI.setUnavailable(LibFunc::exp10l);
|
|
if (T.isOSVersionLT(7, 0)) {
|
|
TLI.setUnavailable(LibFunc::exp10);
|
|
TLI.setUnavailable(LibFunc::exp10f);
|
|
} else {
|
|
TLI.setAvailableWithName(LibFunc::exp10, "__exp10");
|
|
TLI.setAvailableWithName(LibFunc::exp10f, "__exp10f");
|
|
}
|
|
break;
|
|
case Triple::Linux:
|
|
// exp10, exp10f, exp10l is available on Linux (GLIBC) but are extremely
|
|
// buggy prior to glibc version 2.18. Until this version is widely deployed
|
|
// or we have a reasonable detection strategy, we cannot use exp10 reliably
|
|
// on Linux.
|
|
//
|
|
// Fall through to disable all of them.
|
|
default:
|
|
TLI.setUnavailable(LibFunc::exp10);
|
|
TLI.setUnavailable(LibFunc::exp10f);
|
|
TLI.setUnavailable(LibFunc::exp10l);
|
|
}
|
|
|
|
// ffsl is available on at least Darwin, Mac OS X, iOS, FreeBSD, and
|
|
// Linux (GLIBC):
|
|
// http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/ffsl.3.html
|
|
// http://svn.freebsd.org/base/user/eri/pf45/head/lib/libc/string/ffsl.c
|
|
// http://www.gnu.org/software/gnulib/manual/html_node/ffsl.html
|
|
switch (T.getOS()) {
|
|
case Triple::Darwin:
|
|
case Triple::MacOSX:
|
|
case Triple::IOS:
|
|
case Triple::FreeBSD:
|
|
case Triple::Linux:
|
|
break;
|
|
default:
|
|
TLI.setUnavailable(LibFunc::ffsl);
|
|
}
|
|
|
|
// ffsll is available on at least FreeBSD and Linux (GLIBC):
|
|
// http://svn.freebsd.org/base/user/eri/pf45/head/lib/libc/string/ffsll.c
|
|
// http://www.gnu.org/software/gnulib/manual/html_node/ffsll.html
|
|
switch (T.getOS()) {
|
|
case Triple::FreeBSD:
|
|
case Triple::Linux:
|
|
break;
|
|
default:
|
|
TLI.setUnavailable(LibFunc::ffsll);
|
|
}
|
|
|
|
// The following functions are available on at least Linux:
|
|
if (!T.isOSLinux()) {
|
|
TLI.setUnavailable(LibFunc::dunder_strdup);
|
|
TLI.setUnavailable(LibFunc::dunder_strtok_r);
|
|
TLI.setUnavailable(LibFunc::dunder_isoc99_scanf);
|
|
TLI.setUnavailable(LibFunc::dunder_isoc99_sscanf);
|
|
TLI.setUnavailable(LibFunc::under_IO_getc);
|
|
TLI.setUnavailable(LibFunc::under_IO_putc);
|
|
TLI.setUnavailable(LibFunc::memalign);
|
|
TLI.setUnavailable(LibFunc::fopen64);
|
|
TLI.setUnavailable(LibFunc::fseeko64);
|
|
TLI.setUnavailable(LibFunc::fstat64);
|
|
TLI.setUnavailable(LibFunc::fstatvfs64);
|
|
TLI.setUnavailable(LibFunc::ftello64);
|
|
TLI.setUnavailable(LibFunc::lstat64);
|
|
TLI.setUnavailable(LibFunc::open64);
|
|
TLI.setUnavailable(LibFunc::stat64);
|
|
TLI.setUnavailable(LibFunc::statvfs64);
|
|
TLI.setUnavailable(LibFunc::tmpfile64);
|
|
}
|
|
}
|
|
|
|
|
|
TargetLibraryInfo::TargetLibraryInfo() : ImmutablePass(ID) {
|
|
// Default to everything being available.
|
|
memset(AvailableArray, -1, sizeof(AvailableArray));
|
|
|
|
initialize(*this, Triple(), StandardNames);
|
|
}
|
|
|
|
TargetLibraryInfo::TargetLibraryInfo(const Triple &T) : ImmutablePass(ID) {
|
|
// Default to everything being available.
|
|
memset(AvailableArray, -1, sizeof(AvailableArray));
|
|
|
|
initialize(*this, T, StandardNames);
|
|
}
|
|
|
|
TargetLibraryInfo::TargetLibraryInfo(const TargetLibraryInfo &TLI)
|
|
: ImmutablePass(ID) {
|
|
memcpy(AvailableArray, TLI.AvailableArray, sizeof(AvailableArray));
|
|
CustomNames = TLI.CustomNames;
|
|
}
|
|
|
|
namespace {
|
|
struct StringComparator {
|
|
/// Compare two strings and return true if LHS is lexicographically less than
|
|
/// RHS. Requires that RHS doesn't contain any zero bytes.
|
|
bool operator()(const char *LHS, StringRef RHS) const {
|
|
// Compare prefixes with strncmp. If prefixes match we know that LHS is
|
|
// greater or equal to RHS as RHS can't contain any '\0'.
|
|
return std::strncmp(LHS, RHS.data(), RHS.size()) < 0;
|
|
}
|
|
|
|
// Provided for compatibility with MSVC's debug mode.
|
|
bool operator()(StringRef LHS, const char *RHS) const { return LHS < RHS; }
|
|
bool operator()(StringRef LHS, StringRef RHS) const { return LHS < RHS; }
|
|
bool operator()(const char *LHS, const char *RHS) const {
|
|
return std::strcmp(LHS, RHS) < 0;
|
|
}
|
|
};
|
|
}
|
|
|
|
bool TargetLibraryInfo::getLibFunc(StringRef funcName,
|
|
LibFunc::Func &F) const {
|
|
const char **Start = &StandardNames[0];
|
|
const char **End = &StandardNames[LibFunc::NumLibFuncs];
|
|
|
|
// Filter out empty names and names containing null bytes, those can't be in
|
|
// our table.
|
|
if (funcName.empty() || funcName.find('\0') != StringRef::npos)
|
|
return false;
|
|
|
|
// Check for \01 prefix that is used to mangle __asm declarations and
|
|
// strip it if present.
|
|
if (funcName.front() == '\01')
|
|
funcName = funcName.substr(1);
|
|
const char **I = std::lower_bound(Start, End, funcName, StringComparator());
|
|
if (I != End && *I == funcName) {
|
|
F = (LibFunc::Func)(I - Start);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// disableAllFunctions - This disables all builtins, which is used for options
|
|
/// like -fno-builtin.
|
|
void TargetLibraryInfo::disableAllFunctions() {
|
|
memset(AvailableArray, 0, sizeof(AvailableArray));
|
|
}
|