[Bug target/101796] Miss optimization to optimized (vashl op0, (op1: const_duplicate_vector)) to (ashl op0 op1_inner)

crazylht at gmail dot com gcc-bugzilla@gcc.gnu.org
Fri Aug 6 03:23:21 GMT 2021


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101796

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
There's 2 issues.

1. simplify_rtx should be able to simplify it.
2. x86 backend use ix86_gen_scratch_sse_rtx (mode) which prevent simplication.


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