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When I added copysign support for LoongArch (r13-3702), we did not have a copysign RTL insn, so I had to use UNSPEC to represent the copysign instruction. Now the copysign RTX code has been added in r14-1586, so this patch removes those UNSPECs, and it uses the native RTL copysign insn. Inspired by rs6000 patch "Cleanup: Replace UNSPEC_COPYSIGN with copysign RTL" [1] from Michael Meissner. [1]: https://gcc.gnu.org/pipermail/gcc-patches/2023-September/631701.html gcc/ChangeLog: * config/loongarch/loongarch.md (UNSPEC_FCOPYSIGN): Delete. (copysign<mode>3): Use copysign RTL instead of UNSPEC.
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