m68k: Support swap/CAS #28
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jieyouxu
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…kingjubilee Add m68k_target_feature This adds the following unstable target features (tracking issue: rust-lang#134328): - isa-68000 - isa-68010 - isa-68020 - isa-68030 - isa-68040 - isa-68060 - isa-68881 - isa-68882 The feature names and implied features are match with [definitions in LLVM](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/M68k/M68k.td#L21-L57). isa-68881 and isa-68882 are FPU ISA features. isa-68881 is needed to support input/output in floating-point regs in inline assembly. isa-68020 is needed to implement taiki-e/atomic-maybe-uninit#28 more robustly. cc `@glaubitz` `@ricky26` (designated developers of [m68k-unknown-linux-gnu](https://doc.rust-lang.org/nightly/rustc/platform-support/m68k-unknown-linux-gnu.html#designated-developers)) r? workingjubilee `@rustbot` label +O-motorola68k +A-target-feature
rust-timer
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Dec 15, 2024
Rollup merge of rust-lang#134329 - taiki-e:m68k-target-feature, r=workingjubilee Add m68k_target_feature This adds the following unstable target features (tracking issue: rust-lang#134328): - isa-68000 - isa-68010 - isa-68020 - isa-68030 - isa-68040 - isa-68060 - isa-68881 - isa-68882 The feature names and implied features are match with [definitions in LLVM](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/M68k/M68k.td#L21-L57). isa-68881 and isa-68882 are FPU ISA features. isa-68881 is needed to support input/output in floating-point regs in inline assembly. isa-68020 is needed to implement taiki-e/atomic-maybe-uninit#28 more robustly. cc `@glaubitz` `@ricky26` (designated developers of [m68k-unknown-linux-gnu](https://doc.rust-lang.org/nightly/rustc/platform-support/m68k-unknown-linux-gnu.html#designated-developers)) r? workingjubilee `@rustbot` label +O-motorola68k +A-target-feature
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Follow-up to #27.
Tested in the same way as #27.
64-bit atomics cannot be supported yet due LLVM 19 doesn't seem to support cas2 instruction.