[llvm-bugs] [Bug 50918] [LSR] Assertion `!BaseRegs.empty() && "1*reg => reg, should not be needed."' failed.

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Jul 15 22:15:04 PDT 2021


Max Kazantsev <max.kazantsev at azul.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Max Kazantsev <max.kazantsev at azul.com> ---
commit f98ed74f6910f8b09e77497aeb30c860c433610d (HEAD -> main, origin/main)
Author: Max Kazantsev <mkazantsev at azul.com>
Date:   Fri Jul 16 11:31:15 2021 +0700

    [LSR] Handle case 1*reg => reg. PR50918

    This patch addresses assertion failure in case when the only found formula
for LSR
    is `1*reg => reg` which was supposed to be an impossible situation, however
    is a test that shows it is possible.

    In this case, we can use scale register with scale of 1 as the missing base

    Reviewed By: huihuiz, reames
    Differential Revision: https://reviews.llvm.org/D105009

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