================
@@ -831,6 +832,14 @@ of different sizes and signs is forbidden in binary and
ternary builtins.
semantics, see `LangRef
<http://llvm.org/docs/LangRef.html#llvm-min-intrinsics-comparation>`_
for the comparison.
+ T __builtin_elementwise_clz(T x[, T y]) return the number of leading 0
bits in the first argument. If integer types
+ the first argument is 0 and an
optional second argument is provided,
+ the second argument is
returned. If the first argument is 0 but only
+ one argument is provided, the
behaviour is undefined.
+ T __builtin_elementwise_ctz(T x[, T y]) return the number of trailing
0 bits in the first argument. If integer types
+ the first argument is 0 and an
optional second argument is provided,
+ the second argument is
returned. If the first argument is 0 but only
+ one argument is provided, the
behaviour is undefined.
----------------
frasercrmck wrote:
> Could do an RFC I suppose. I always found the target selection of behavior
> absurd with the gcc builtins
I've started an RFC:
https://discourse.llvm.org/t/rfc-introducing-elementwise-clz-ctz-builtins/85862.
https://github.com/llvm/llvm-project/pull/131995
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