[CUDA] Don't define functions that the CUDA headers themselves define on Windows.

[tra]

clang/lib/Headers/__clang_cuda_cmath.h

76

inscrutable?

[jlebar]

clang/lib/Headers/__clang_cuda_cmath.h

76

Thanks. :)

clang/lib/Headers/__clang_cuda_cmath.h

 }
 __DEVICE__ int fpclassify(double __x) {
   return __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL, FP_SUBNORMAL,
                               FP_ZERO, __x);
 }
 __DEVICE__ float frexp(float __arg, int *__exp) {
   return ::frexpf(__arg, __exp);
 }
+
+// For inscrutible reasons, the CUDA headers define these functions for us on
+// Windows.
+#ifndef _MSC_VER
 __DEVICE__ bool isinf(float __x) { return ::__isinff(__x); }
 __DEVICE__ bool isinf(double __x) { return ::__isinf(__x); }
 __DEVICE__ bool isfinite(float __x) { return ::__finitef(__x); }
 // For inscrutable reasons, __finite(), the double-precision version of
 // __finitef, does not exist when compiling for MacOS.  __isfinited is available
 // everywhere and is just as good.
 __DEVICE__ bool isfinite(double __x) { return ::__isfinited(__x); }
+__DEVICE__ bool isnan(float __x) { return ::__isnanf(__x); }
+__DEVICE__ bool isnan(double __x) { return ::__isnan(__x); }
+#endif
+
 __DEVICE__ bool isgreater(float __x, float __y) {
   return __builtin_isgreater(__x, __y);
 }
 __DEVICE__ bool isgreater(double __x, double __y) {
   return __builtin_isgreater(__x, __y);
 }
 __DEVICE__ bool isgreaterequal(float __x, float __y) {
   return __builtin_isgreaterequal(__x, __y);
__DEVICE__ bool islessequal(double __x, double __y) {
   return __builtin_islessequal(__x, __y);
 }
 __DEVICE__ bool islessgreater(float __x, float __y) {
   return __builtin_islessgreater(__x, __y);
 }
 __DEVICE__ bool islessgreater(double __x, double __y) {
   return __builtin_islessgreater(__x, __y);
 }
-__DEVICE__ bool isnan(float __x) { return ::__isnanf(__x); }
-__DEVICE__ bool isnan(double __x) { return ::__isnan(__x); }
 __DEVICE__ bool isnormal(float __x) { return __builtin_isnormal(__x); }
 __DEVICE__ bool isnormal(double __x) { return __builtin_isnormal(__x); }
 __DEVICE__ bool isunordered(float __x, float __y) {
   return __builtin_isunordered(__x, __y);
 }
 __DEVICE__ bool isunordered(double __x, double __y) {
   return __builtin_isunordered(__x, __y);
 }