[PATCH] D141798: Drop the ZeroBehavior parameter from countLeadingZeros and the like (NFC)

[Sergei Barannikov via Phabricator via cfe-commits]

barannikov88 accepted this revision.
barannikov88 added a comment.
This revision is now accepted and ready to land.

LGTM



================
Comment at: llvm/include/llvm/Support/MathExtras.h:212
 /// Only unsigned integral types are allowed.
-///
-/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
-///   valid arguments.
-template <typename T> T findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) {
-  if (ZB == ZB_Max && Val == 0)
+template <typename T> T findFirstSet(T Val) {
+  if (Val == 0)
----------------
kazu wrote:
> craig.topper wrote:
> > Note, x86 does not have an efficient instruction for find first set with zero returning -1. It will require a cmov to handle zero.
> The new iteration of the patch leaves findFirstSet and findLastSet untouched.
(optional) ZB could be made a template argument and constexpr-ifed.



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  https://reviews.llvm.org/D141798/new/

https://reviews.llvm.org/D141798