craig.topper added inline comments.

================
Comment at: clang/include/clang/Basic/BuiltinsX86.def:1904
+// BITSCAN
+TARGET_BUILTIN(_BitScanForward, "UcUNi*UNi", "n", "")
+TARGET_BUILTIN(_BitScanReverse, "UcUNi*UNi", "n", "")
----------------
The N specifier here is sort of MSVC mode specific. I need to think about this.

This also makes this available without including a header file which isn't good 
if it doesn't start with __builtin.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D75723/new/

https://reviews.llvm.org/D75723



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