[PATCH] D14590: [SimplifyLibCalls] Constant folding for fls, flsl, flsll

[Eli Friedman via Phabricator via llvm-commits]

efriedma added inline comments.


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Comment at: lib/Transforms/Utils/SimplifyLibCalls.cpp:1558
+    return B.getInt32(CI->getType()->getBitWidth() -
+                      CI->getValue().countLeadingZeros());
+  }
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Maybe we should just unconditionally lower fls() to llvm.ctlz()?


https://reviews.llvm.org/D14590