[TLI] Add declarations for various math header file routines from math-finite.h that create '__<func>_finite as functions

[chrischr]

Summary

This is the first of a set of patches to followup on the thread in http://lists.llvm.org/pipermail/llvm-dev/2017-March/111323.html

When -ffast-math is enabled, various math function names get redirected by the FE to alternate versions. This happens because the -ffast-math option causes the math.h header file to be preprocessed with the macro FINITE_MATH_ONLY set to 1, which causes some asm statements to be processed that rename certain math functions.

For example, 'exp' gets put into the IR as '__exp_finite'

The alternate versions are currently not recognized by the optimizer, which results in some missed optimizations opportunities that would have been handled without the -ffast-math flag.

This change adds important functions to the target library info table. Subsequent patches will make use of this change to add some of these function for cases of constant folding or vectorization.

[andrew.w.kaylor]

Can you add tests for these changes? I think the attribute.ll and no-proto.ll tests in test/Transforms/InferFunctionAttrs would be the right place to add these. I'm not sure if the existing tests check all of the LibFunc calls or just a representative sample.

include/llvm/Analysis/TargetLibraryInfo.def

165

Is there a reason for these being inserted where they are? It looks rather arbitrary.

[chrischr]

include/llvm/Analysis/TargetLibraryInfo.def

165

The list needs to be created in sorted order based on the value of the string definition.

static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
                       ArrayRef<StringRef> StandardNames) {
  // Verify that the StandardNames array is in alphabetical order.
  assert(std::is_sorted(StandardNames.begin(), StandardNames.end(),
                        [](StringRef LHS, StringRef RHS) {
                          return LHS < RHS;
                        }) &&
         "TargetLibraryInfoImpl function names must be sorted");

[andrew.w.kaylor]

include/llvm/Analysis/TargetLibraryInfo.def

165

OK. That makes sense now.

What about a test?

[ab]

This looks fine; the TLI unittest is the best place for testing this. (for instance, no-proto.ll wouldn't help, because the pass doesn't know about these libfuncs and can't modify them anyway, regardless of the prototype)

Beyond that, I'm curious: should these be added as names only, and treated as "aliases" of the non-finite functions (only when -ffinite-math-only) ? Or, put another way: is it ever desirable to distinguish between them?

[chrischr]

New version uploaded which adds changes to the unit test files in test/Transformas/InferFnctionAttrs to include the newly added TLI function prototypes.

[chrischr]

@ Andrew: New files uploaded for additional testing for function prototype matching. Although for the TargetLibraryInfo.def, test coverage should be coming about from the unittests/Analysis/TargetLibraryInfoTest.cpp test case, since this verifies that every function listed in the .def file gets matched against the definition in this test case.

@ ab: I looked back at the TargetLibraryInfo code, but don't see any support for indicating function aliases there. However, I don't think it would be desirable to map them to be the same as the non-finite version, because while during some of the optimization phases they need to be treated similarly, when it comes to the code generation phase they need to be treated uniquely to call either the regular version or the finite version to get the optimized library version.

include/llvm/Analysis/TargetLibraryInfo.def

165

BTW, the test. unittests/Analysis/TargetLibraryInfoTest.cpp. checks that every function in the TLI table can be looked up.

[andrew.w.kaylor]

Looks good to me.

[andrew.w.kaylor]

lib/Analysis/TargetLibraryInfo.cpp

243

Am I reading this correctly as saying these will only be marked as unavailable for 32-bit Windows targets? The comment implies they should be unavailable for all Windows targets, right?

[chrischr]

lib/Analysis/TargetLibraryInfo.cpp

243

Good point, you are correct. These should be moved outside of this 'if' condition. I'll fix and upload a new revision.

[chrischr]

Fixed calls to SetUnavailable to be for Windows, not just Windows x86.

[andrew.w.kaylor]

Still approved.

Do you need someone to commit this for you?

[chrischr]

Still approved.
Do you need someone to commit this for you?

Yes, please. Thanks in advance!

include/llvm/Analysis/TargetLibraryInfo.def

 TLI_DEFINE_ENUM_INTERNAL(ZnwjRKSt9nothrow_t)
 TLI_DEFINE_STRING_INTERNAL("_ZnwjRKSt9nothrow_t")
 /// void *new(unsigned long);
 TLI_DEFINE_ENUM_INTERNAL(Znwm)
 TLI_DEFINE_STRING_INTERNAL("_Znwm")
 /// void *new(unsigned long, nothrow);
 TLI_DEFINE_ENUM_INTERNAL(ZnwmRKSt9nothrow_t)
 TLI_DEFINE_STRING_INTERNAL("_ZnwmRKSt9nothrow_t")
+/// double __acos_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(acos_finite)
+TLI_DEFINE_STRING_INTERNAL("__acos_finite")
+/// float __acosf_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(acosf_finite)
+TLI_DEFINE_STRING_INTERNAL("__acosf_finite")
+/// double __acosh_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(acosh_finite)
+TLI_DEFINE_STRING_INTERNAL("__acosh_finite")
+/// float __acoshf_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(acoshf_finite)
+TLI_DEFINE_STRING_INTERNAL("__acoshf_finite")
+/// long double __acoshl_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(acoshl_finite)
+TLI_DEFINE_STRING_INTERNAL("__acoshl_finite")
+/// long double __acosl_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(acosl_finite)
+TLI_DEFINE_STRING_INTERNAL("__acosl_finite")
+/// double __asin_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(asin_finite)
+TLI_DEFINE_STRING_INTERNAL("__asin_finite")
+/// float __asinf_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(asinf_finite)
+TLI_DEFINE_STRING_INTERNAL("__asinf_finite")
+/// long double __asinl_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(asinl_finite)
+TLI_DEFINE_STRING_INTERNAL("__asinl_finite")
+/// double atan2_finite(double y, double x);
+TLI_DEFINE_ENUM_INTERNAL(atan2_finite)
+TLI_DEFINE_STRING_INTERNAL("__atan2_finite")
+/// float atan2f_finite(float y, float x);
+TLI_DEFINE_ENUM_INTERNAL(atan2f_finite)
+TLI_DEFINE_STRING_INTERNAL("__atan2f_finite")
+/// long double atan2l_finite(long double y, long double x);
+TLI_DEFINE_ENUM_INTERNAL(atan2l_finite)
+TLI_DEFINE_STRING_INTERNAL("__atan2l_finite")
+/// double __atanh_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(atanh_finite)
+TLI_DEFINE_STRING_INTERNAL("__atanh_finite")
+/// float __atanhf_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(atanhf_finite)
+TLI_DEFINE_STRING_INTERNAL("__atanhf_finite")
+/// long double __atanhl_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(atanhl_finite)
+TLI_DEFINE_STRING_INTERNAL("__atanhl_finite")
+/// double __cosh_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(cosh_finite)
+TLI_DEFINE_STRING_INTERNAL("__cosh_finite")
+/// float __coshf_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(coshf_finite)
+TLI_DEFINE_STRING_INTERNAL("__coshf_finite")
+/// long double __coshl_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(coshl_finite)
+TLI_DEFINE_STRING_INTERNAL("__coshl_finite")
 /// double __cospi(double x);
 TLI_DEFINE_ENUM_INTERNAL(cospi)
 TLI_DEFINE_STRING_INTERNAL("__cospi")
 /// float __cospif(float x);
 TLI_DEFINE_ENUM_INTERNAL(cospif)
 TLI_DEFINE_STRING_INTERNAL("__cospif")
 /// int __cxa_atexit(void (*f)(void *), void *p, void *d);
 TLI_DEFINE_ENUM_INTERNAL(cxa_atexit)
 TLI_DEFINE_STRING_INTERNAL("__cxa_atexit")
 /// void __cxa_guard_abort(guard_t *guard);
 /// guard_t is int64_t in Itanium ABI or int32_t on ARM eabi.
 TLI_DEFINE_ENUM_INTERNAL(cxa_guard_abort)
 TLI_DEFINE_STRING_INTERNAL("__cxa_guard_abort")
 /// int __cxa_guard_acquire(guard_t *guard);
 TLI_DEFINE_ENUM_INTERNAL(cxa_guard_acquire)
 TLI_DEFINE_STRING_INTERNAL("__cxa_guard_acquire")
 /// void __cxa_guard_release(guard_t *guard);
 TLI_DEFINE_ENUM_INTERNAL(cxa_guard_release)
 TLI_DEFINE_STRING_INTERNAL("__cxa_guard_release")
+/// double __exp10_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(exp10_finite)
+TLI_DEFINE_STRING_INTERNAL("__exp10_finite")
+/// float __exp10f_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(exp10f_finite)
+TLI_DEFINE_STRING_INTERNAL("__exp10f_finite")
+/// long double __exp10l_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(exp10l_finite)
+TLI_DEFINE_STRING_INTERNAL("__exp10l_finite")
+/// double __exp2_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(exp2_finite)
+TLI_DEFINE_STRING_INTERNAL("__exp2_finite")
+/// float __exp2f_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(exp2f_finite)
+TLI_DEFINE_STRING_INTERNAL("__exp2f_finite")
+/// long double __exp2l_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(exp2l_finite)
+TLI_DEFINE_STRING_INTERNAL("__exp2l_finite")
+/// double __exp_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(exp_finite)
+TLI_DEFINE_STRING_INTERNAL("__exp_finite")
+/// float __expf_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(expf_finite)
+TLI_DEFINE_STRING_INTERNAL("__expf_finite")
+/// long double __expl_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(expl_finite)
+TLI_DEFINE_STRING_INTERNAL("__expl_finite")
 /// int __isoc99_scanf (const char *format, ...)
 TLI_DEFINE_ENUM_INTERNAL(dunder_isoc99_scanf)
 TLI_DEFINE_STRING_INTERNAL("__isoc99_scanf")
 /// int __isoc99_sscanf(const char *s, const char *format, ...)
 TLI_DEFINE_ENUM_INTERNAL(dunder_isoc99_sscanf)
 TLI_DEFINE_STRING_INTERNAL("__isoc99_sscanf")
+/// double __log10_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(log10_finite)
+TLI_DEFINE_STRING_INTERNAL("__log10_finite")
+/// float __log10f_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(log10f_finite)
+TLI_DEFINE_STRING_INTERNAL("__log10f_finite")
+/// long double __log10l_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(log10l_finite)
+TLI_DEFINE_STRING_INTERNAL("__log10l_finite")
+/// double __log2_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(log2_finite)
+TLI_DEFINE_STRING_INTERNAL("__log2_finite")
+/// float __log2f_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(log2f_finite)
+TLI_DEFINE_STRING_INTERNAL("__log2f_finite")
+/// long double __log2l_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(log2l_finite)
+TLI_DEFINE_STRING_INTERNAL("__log2l_finite")
+/// double __log_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(log_finite)
+TLI_DEFINE_STRING_INTERNAL("__log_finite")
+/// float __logf_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(logf_finite)
+TLI_DEFINE_STRING_INTERNAL("__logf_finite")
+/// long double __logl_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(logl_finite)
+TLI_DEFINE_STRING_INTERNAL("__logl_finite")
 /// void *__memcpy_chk(void *s1, const void *s2, size_t n, size_t s1size);
 TLI_DEFINE_ENUM_INTERNAL(memcpy_chk)
 TLI_DEFINE_STRING_INTERNAL("__memcpy_chk")
 /// void *__memmove_chk(void *s1, const void *s2, size_t n, size_t s1size);
 TLI_DEFINE_ENUM_INTERNAL(memmove_chk)
 TLI_DEFINE_STRING_INTERNAL("__memmove_chk")
 /// void *__memset_chk(void *s, char v, size_t n, size_t s1size);
 TLI_DEFINE_ENUM_INTERNAL(memset_chk)
 TLI_DEFINE_STRING_INTERNAL("__memset_chk")
 
 // int __nvvm_reflect(const char *)
 TLI_DEFINE_ENUM_INTERNAL(nvvm_reflect)
 TLI_DEFINE_STRING_INTERNAL("__nvvm_reflect")
-
+/// double __pow_finite(double x, double y);
+TLI_DEFINE_ENUM_INTERNAL(pow_finite)
+TLI_DEFINE_STRING_INTERNAL("__pow_finite")
+/// float _powf_finite(float x, float y);
+TLI_DEFINE_ENUM_INTERNAL(powf_finite)
+TLI_DEFINE_STRING_INTERNAL("__powf_finite")
+/// long double __powl_finite(long double x, long double y);
+TLI_DEFINE_ENUM_INTERNAL(powl_finite)
+TLI_DEFINE_STRING_INTERNAL("__powl_finite")
 /// double __sincospi_stret(double x);
 TLI_DEFINE_ENUM_INTERNAL(sincospi_stret)
 TLI_DEFINE_STRING_INTERNAL("__sincospi_stret")
 /// float __sincospif_stret(float x);
 TLI_DEFINE_ENUM_INTERNAL(sincospif_stret)
 TLI_DEFINE_STRING_INTERNAL("__sincospif_stret")
+/// double __sinh_finite(double x);
+TLI_DEFINE_ENUM_INTERNAL(sinh_finite)
+TLI_DEFINE_STRING_INTERNAL("__sinh_finite")
+/// float _sinhf_finite(float x);
+TLI_DEFINE_ENUM_INTERNAL(sinhf_finite)
+TLI_DEFINE_STRING_INTERNAL("__sinhf_finite")
+/// long double __sinhl_finite(long double x);
+TLI_DEFINE_ENUM_INTERNAL(sinhl_finite)
+TLI_DEFINE_STRING_INTERNAL("__sinhl_finite")
 /// double __sinpi(double x);
 TLI_DEFINE_ENUM_INTERNAL(sinpi)
 TLI_DEFINE_STRING_INTERNAL("__sinpi")
 /// float __sinpif(float x);
 TLI_DEFINE_ENUM_INTERNAL(sinpif)
 TLI_DEFINE_STRING_INTERNAL("__sinpif")
 /// double __sqrt_finite(double x);
 TLI_DEFINE_ENUM_INTERNAL(sqrt_finite)

lib/Analysis/TargetLibraryInfo.cpp

if (T.getArch() == Triple::x86) {
       TLI.setUnavailable(LibFunc_log10f);
       TLI.setUnavailable(LibFunc_modff);
       TLI.setUnavailable(LibFunc_powf);
       TLI.setUnavailable(LibFunc_sinf);
       TLI.setUnavailable(LibFunc_sinhf);
       TLI.setUnavailable(LibFunc_sqrtf);
       TLI.setUnavailable(LibFunc_tanf);
       TLI.setUnavailable(LibFunc_tanhf);
+
+      // These definitions are due to math-finite.h header on Linux
+      TLI.setUnavailable(LibFunc_acos_finite);
+      TLI.setUnavailable(LibFunc_acosf_finite);
+      TLI.setUnavailable(LibFunc_acosl_finite);
+      TLI.setUnavailable(LibFunc_acosh_finite);
+      TLI.setUnavailable(LibFunc_acoshf_finite);
+      TLI.setUnavailable(LibFunc_acoshl_finite);
+      TLI.setUnavailable(LibFunc_asin_finite);
+      TLI.setUnavailable(LibFunc_asinf_finite);
+      TLI.setUnavailable(LibFunc_asinl_finite);
+      TLI.setUnavailable(LibFunc_atan2_finite);
+      TLI.setUnavailable(LibFunc_atan2f_finite);
+      TLI.setUnavailable(LibFunc_atan2l_finite);
+      TLI.setUnavailable(LibFunc_atanh_finite);
+      TLI.setUnavailable(LibFunc_atanhf_finite);
+      TLI.setUnavailable(LibFunc_atanhl_finite);
+      TLI.setUnavailable(LibFunc_cosh_finite);
+      TLI.setUnavailable(LibFunc_coshf_finite);
+      TLI.setUnavailable(LibFunc_coshl_finite);
+      TLI.setUnavailable(LibFunc_exp10_finite);
+      TLI.setUnavailable(LibFunc_exp10f_finite);
+      TLI.setUnavailable(LibFunc_exp10l_finite);
+      TLI.setUnavailable(LibFunc_exp2_finite);
+      TLI.setUnavailable(LibFunc_exp2f_finite);
+      TLI.setUnavailable(LibFunc_exp2l_finite);
+      TLI.setUnavailable(LibFunc_exp_finite);
+      TLI.setUnavailable(LibFunc_expf_finite);
+      TLI.setUnavailable(LibFunc_expl_finite);
+      TLI.setUnavailable(LibFunc_log10_finite);
+      TLI.setUnavailable(LibFunc_log10f_finite);
+      TLI.setUnavailable(LibFunc_log10l_finite);
+      TLI.setUnavailable(LibFunc_log2_finite);
+      TLI.setUnavailable(LibFunc_log2f_finite);
+      TLI.setUnavailable(LibFunc_log2l_finite);
+      TLI.setUnavailable(LibFunc_log_finite);
+      TLI.setUnavailable(LibFunc_logf_finite);
+      TLI.setUnavailable(LibFunc_logl_finite);
+      TLI.setUnavailable(LibFunc_pow_finite);
+      TLI.setUnavailable(LibFunc_powf_finite);
+      TLI.setUnavailable(LibFunc_powl_finite);
+      TLI.setUnavailable(LibFunc_sinh_finite);
+      TLI.setUnavailable(LibFunc_sinhf_finite);
+      TLI.setUnavailable(LibFunc_sinhl_finite);
     }
 
     // Win32 does *not* provide provide these functions, but they are
     // generally available on POSIX-compliant systems:
     TLI.setUnavailable(LibFunc_access);
     TLI.setUnavailable(LibFunc_bcmp);
     TLI.setUnavailable(LibFunc_bcopy);
     TLI.setUnavailable(LibFunc_bzero);
bool TargetLibraryInfoImpl::isValidProtoForLibFunc(const FunctionType &FTy,
   case LibFunc_nvvm_reflect:
     return (NumParams == 1 && FTy.getParamType(0)->isPointerTy());
 
   case LibFunc_sincospi_stret:
   case LibFunc_sincospif_stret:
     return (NumParams == 1 && FTy.getParamType(0)->isFloatingPointTy());
 
   case LibFunc_acos:
+  case LibFunc_acos_finite:
   case LibFunc_acosf:
+  case LibFunc_acosf_finite:
   case LibFunc_acosh:
+  case LibFunc_acosh_finite:
   case LibFunc_acoshf:
+  case LibFunc_acoshf_finite:
   case LibFunc_acoshl:
+  case LibFunc_acoshl_finite:
   case LibFunc_acosl:
+  case LibFunc_acosl_finite:
   case LibFunc_asin:
+  case LibFunc_asin_finite:
   case LibFunc_asinf:
+  case LibFunc_asinf_finite:
   case LibFunc_asinh:
   case LibFunc_asinhf:
   case LibFunc_asinhl:
   case LibFunc_asinl:
+  case LibFunc_asinl_finite:
   case LibFunc_atan:
   case LibFunc_atanf:
   case LibFunc_atanh:
+  case LibFunc_atanh_finite:
   case LibFunc_atanhf:
+  case LibFunc_atanhf_finite:
   case LibFunc_atanhl:
+  case LibFunc_atanhl_finite:
   case LibFunc_atanl:
   case LibFunc_cbrt:
   case LibFunc_cbrtf:
   case LibFunc_cbrtl:
   case LibFunc_ceil:
   case LibFunc_ceilf:
   case LibFunc_ceill:
   case LibFunc_cos:
   case LibFunc_cosf:
   case LibFunc_cosh:
+  case LibFunc_cosh_finite:
   case LibFunc_coshf:
+  case LibFunc_coshf_finite:
   case LibFunc_coshl:
+  case LibFunc_coshl_finite:
   case LibFunc_cosl:
   case LibFunc_exp10:
+  case LibFunc_exp10_finite:
   case LibFunc_exp10f:
+  case LibFunc_exp10f_finite:
   case LibFunc_exp10l:
+  case LibFunc_exp10l_finite:
   case LibFunc_exp2:
+  case LibFunc_exp2_finite:
   case LibFunc_exp2f:
+  case LibFunc_exp2f_finite:
   case LibFunc_exp2l:
+  case LibFunc_exp2l_finite:
   case LibFunc_exp:
+  case LibFunc_exp_finite:
   case LibFunc_expf:
+  case LibFunc_expf_finite:
   case LibFunc_expl:
+  case LibFunc_expl_finite:
   case LibFunc_expm1:
   case LibFunc_expm1f:
   case LibFunc_expm1l:
   case LibFunc_fabs:
   case LibFunc_fabsf:
   case LibFunc_fabsl:
   case LibFunc_floor:
   case LibFunc_floorf:
   case LibFunc_floorl:
   case LibFunc_log10:
+  case LibFunc_log10_finite:
   case LibFunc_log10f:
+  case LibFunc_log10f_finite:
   case LibFunc_log10l:
+  case LibFunc_log10l_finite:
   case LibFunc_log1p:
   case LibFunc_log1pf:
   case LibFunc_log1pl:
   case LibFunc_log2:
+  case LibFunc_log2_finite:
   case LibFunc_log2f:
+  case LibFunc_log2f_finite:
   case LibFunc_log2l:
+  case LibFunc_log2l_finite:
   case LibFunc_log:
+  case LibFunc_log_finite:
   case LibFunc_logb:
   case LibFunc_logbf:
   case LibFunc_logbl:
   case LibFunc_logf:
+  case LibFunc_logf_finite:
   case LibFunc_logl:
+  case LibFunc_logl_finite:
   case LibFunc_nearbyint:
   case LibFunc_nearbyintf:
   case LibFunc_nearbyintl:
   case LibFunc_rint:
   case LibFunc_rintf:
   case LibFunc_rintl:
   case LibFunc_round:
   case LibFunc_roundf:
   case LibFunc_roundl:
   case LibFunc_sin:
   case LibFunc_sinf:
   case LibFunc_sinh:
+  case LibFunc_sinh_finite:
   case LibFunc_sinhf:
+  case LibFunc_sinhf_finite:
   case LibFunc_sinhl:
+  case LibFunc_sinhl_finite:
   case LibFunc_sinl:
   case LibFunc_sqrt:
   case LibFunc_sqrt_finite:
   case LibFunc_sqrtf:
   case LibFunc_sqrtf_finite:
   case LibFunc_sqrtl:
   case LibFunc_sqrtl_finite:
   case LibFunc_tan:
   case LibFunc_tanf:
   case LibFunc_tanh:
   case LibFunc_tanhf:
   case LibFunc_tanhl:
   case LibFunc_tanl:
   case LibFunc_trunc:
   case LibFunc_truncf:
   case LibFunc_truncl:
     return (NumParams == 1 && FTy.getReturnType()->isFloatingPointTy() &&
             FTy.getReturnType() == FTy.getParamType(0));
 
   case LibFunc_atan2:
+  case LibFunc_atan2_finite:
   case LibFunc_atan2f:
+  case LibFunc_atan2f_finite:
   case LibFunc_atan2l:
+  case LibFunc_atan2l_finite:
   case LibFunc_fmin:
   case LibFunc_fminf:
   case LibFunc_fminl:
   case LibFunc_fmax:
   case LibFunc_fmaxf:
   case LibFunc_fmaxl:
   case LibFunc_fmod:
   case LibFunc_fmodf:
   case LibFunc_fmodl:
   case LibFunc_copysign:
   case LibFunc_copysignf:
   case LibFunc_copysignl:
   case LibFunc_pow:
+  case LibFunc_pow_finite:
   case LibFunc_powf:
+  case LibFunc_powf_finite:
   case LibFunc_powl:
+  case LibFunc_powl_finite:
     return (NumParams == 2 && FTy.getReturnType()->isFloatingPointTy() &&
             FTy.getReturnType() == FTy.getParamType(0) &&
             FTy.getReturnType() == FTy.getParamType(1));
 
   case LibFunc_ldexp:
   case LibFunc_ldexpf:
   case LibFunc_ldexpl:
     return (NumParams == 2 && FTy.getReturnType()->isFloatingPointTy() &&

unittests/Analysis/TargetLibraryInfoTest.cpp

parseAssembly(
     "declare i32 @htonl(i32)\n"
     "declare i16 @htons(i16)\n"
     "declare i32 @ntohl(i32)\n"
     "declare i16 @ntohs(i16)\n"
 
     "declare i32 @isascii(i32)\n"
     "declare i32 @isdigit(i32)\n"
     "declare i32 @toascii(i32)\n"
+
+    // These functions were extracted from math-finite.h which provides
+    // functions similar to those in math.h, but optimized for handling
+    // finite values only.
+    "declare double @__acos_finite(double)\n"
+    "declare float @__acosf_finite(float)\n"
+    "declare x86_fp80 @__acosl_finite(x86_fp80)\n"
+    "declare double @__acosh_finite(double)\n"
+    "declare float @__acoshf_finite(float)\n"
+    "declare x86_fp80 @__acoshl_finite(x86_fp80)\n"
+    "declare double @__asin_finite(double)\n"
+    "declare float @__asinf_finite(float)\n"
+    "declare x86_fp80 @__asinl_finite(x86_fp80)\n"
+    "declare double @__atan2_finite(double, double)\n"
+    "declare float @__atan2f_finite(float, float)\n"
+    "declare x86_fp80 @__atan2l_finite(x86_fp80, x86_fp80)\n"
+    "declare double @__atanh_finite(double)\n"
+    "declare float @__atanhf_finite(float)\n"
+    "declare x86_fp80 @__atanhl_finite(x86_fp80)\n"
+    "declare double @__cosh_finite(double)\n"
+    "declare float @__coshf_finite(float)\n"
+    "declare x86_fp80 @__coshl_finite(x86_fp80)\n"
+    "declare double @__exp10_finite(double)\n"
+    "declare float @__exp10f_finite(float)\n"
+    "declare x86_fp80 @__exp10l_finite(x86_fp80)\n"
+    "declare double @__exp2_finite(double)\n"
+    "declare float @__exp2f_finite(float)\n"
+    "declare x86_fp80 @__exp2l_finite(x86_fp80)\n"
+    "declare double @__exp_finite(double)\n"
+    "declare float @__expf_finite(float)\n"
+    "declare x86_fp80 @__expl_finite(x86_fp80)\n"     
+    "declare double @__log10_finite(double)\n"
+    "declare float @__log10f_finite(float)\n"
+    "declare x86_fp80 @__log10l_finite(x86_fp80)\n"
+    "declare double @__log2_finite(double)\n"
+    "declare float @__log2f_finite(float)\n"
+    "declare x86_fp80 @__log2l_finite(x86_fp80)\n"
+    "declare double @__log_finite(double)\n"
+    "declare float @__logf_finite(float)\n"
+    "declare x86_fp80 @__logl_finite(x86_fp80)\n"
+    "declare double @__pow_finite(double, double)\n"
+    "declare float @__powf_finite(float, float)\n"
+    "declare x86_fp80 @__powl_finite(x86_fp80, x86_fp80)\n"
+    "declare double @__sinh_finite(double)\n"
+    "declare float @__sinhf_finite(float)\n"
+    "declare x86_fp80 @__sinhl_finite(x86_fp80)\n"
     );
 
   for (unsigned FI = 0; FI != LibFunc::NumLibFuncs; ++FI) {
     LibFunc LF = (LibFunc)FI;
     // Make sure everything is available; we're not testing target defaults.
     TLII.setAvailable(LF);
     Function *F = M->getFunction(TLI.getName(LF));
     EXPECT_TRUE(isLibFunc(F, LF));
   }
 }