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[Bug middle-end/66588] combine should try transforming if_then_else of zero_extends into zero_extend of if_then_else


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66588

--- Comment #1 from UroÅ Bizjak <ubizjak at gmail dot com> ---
BTW: x86_64 is missing any form of zero-extended cmove.

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