bring back to sm_75 considering intel#5642

Author: pgorlani

clang/include/clang/Basic/BuiltinsNVPTX.def

@@ -220,7 +220,7 @@ BUILTIN(__nvvm_cos_approx_f, "ff", "")
 
 // Tanh
 
-TARGET_BUILTIN(__nvvm_tanh_approx_f, "ff", "", AND(SM_80,PTX70))
+TARGET_BUILTIN(__nvvm_tanh_approx_f, "ff", "", AND(SM_75,PTX70))
 TARGET_BUILTIN(__nvvm_tanh_approx_f16, "hh", "", AND(SM_75, PTX70))
 TARGET_BUILTIN(__nvvm_tanh_approx_f16x2, "V2hV2h", "", AND(SM_75, PTX70))
 

clang/include/clang/Driver/Options.td

@@ -4728,7 +4728,7 @@ def fno_sycl_device_lib_EQ : CommaJoined<["-"], "fno-sycl-device-lib=">, Group<s
   "are libc, libm-fp32, libm-fp64, all">;
 defm nvvm_cuda_approx_tanh : BoolFOption<"sycl-cuda-approx-tanh",
   TargetOpts<"NVVMCudaApproxTanhf">, DefaultFalse,
-  PosFlag<SetTrue, [CC1Option], "Use the built-in fast approximation of tanh function. Device needs to have a compute capability >= 8.0">,
+  PosFlag<SetTrue, [CC1Option], "Use the built-in fast approximation of tanh function for devices having c.c.>=7.5">,
   NegFlag<SetFalse>>;
 //===----------------------------------------------------------------------===//
 // FLangOption + CoreOption + NoXarchOption