On April 13, 2018 9:33:31 PM GMT+02:00, Eric Botcazou <ebotca...@adacore.com> 
wrote:
>> 2018-04-13  Jakub Jelinek  <ja...@redhat.com>
>> 
>>      PR rtl-optimization/85376
>>      * simplify-rtx.c (simplify_const_unary_operation): For CLZ and CTZ
>and
>>      zero op0, if C?Z_DEFINED_VALUE_AT_ZERO is false, return NULL_RTX
>>      instead of a specific value.
>> 
>>      * gcc.dg/pr85376.c: New test.
>
>My preference would be for this one.

Likewise. 

Richard. 

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