[llvm-bugs] [Bug 43040] riscv - error in backend: Cannot select: 0x55d7f7ff1300: f32 = fcopysign 0x55d7f7ff1c58, 0x55d7f7fe9fb8

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43040

Luís Marques <luis at luismarques.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
                 CC|                            |luis at luismarques.eu

--- Comment #2 from Luís Marques <luis at luismarques.eu> ---
Thanks for the bug report Khem Raj. This problem was caused by the
implementation of the IEEE 754 copySign operation for RISC-V. The RISC-V
backend only natively supports doing sign copies where the magnitude and sign
operands have the same type. An optimization would remove the conversion of the
sign operand to the correct type, thus triggering the problem. A patch has been
posted for review that solves this problem: <https://reviews.llvm.org/D66725>.
Thanks again!

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