[PATCH] D50815: Establish the <bit> header

[Craig Topper via Phabricator via cfe-commits]

craig.topper added inline comments.


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Comment at: include/bit:145
+  static_assert(sizeof(unsigned) == 4, "");
+  return __popcnt(__x);
+#endif
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How does this work on pre-Haswell X86 CPUs? Doesn't MSVC just blindly emit the popcnt instruction when it sees this?


https://reviews.llvm.org/D50815