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[RISCV] Support RISCV Atomics ABI attributes (#84597)
This patch adds support for the `atomic_abi` attribute, specifid in https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc#tag_riscv_atomic_abi-14-uleb128version. The atomics_abi tag merging is conducted as follows: - UNKNOWN is safe to merge with all other values. - A6C is compatible with A6S, and results in the A6C ABI. - A6C is incompatible with A7, and results in an error. - A6S and A7 are compatible, and merging results in the A7 ABI. Note: the A7 is not yet supported in either LLVM or in any current hardware, and is therefore ommited from attribute generation in RISCVTargetStreamer.
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Original file line number | Diff line number | Diff line change |
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@@ -24,3 +24,6 @@ | |
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.attribute priv_spec_revision, 0 | ||
# CHECK: attribute 12, 0 | ||
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.attribute atomic_abi, 0 | ||
# CHECK: attribute 14, 0 |
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