Paul Kirth a4fec164bf Reapply "[llvm][RISCV] Enable trailing fences for seq-cst stores by default (#87376)" (#90267) ...

With the tag merging in place, we can safely change the default for
+seq-cst-trailing-fence to the default, according to the recommendation
in
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-atomic.adoc

This patch changes the default for the feature flag, and moves to more
consistent naming with respect to existing features.

This was reverted with https://github.com/llvm/llvm-project/pull/84597,
because ld.bfd would segfault with unknown riscv attributes. Now that
attributes emission is guarded with a backend flag,
`--riscv-abi-attributes`, this should be safe to reland, since it won't 
introduce abi tags unless the user opts into them.

2024-07-08 13:35:36 -07:00

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