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53efb3d4f3
Relax r29 inline asm restriction on PowerPC64 targets LLVM uses r29 to hold a base pointer for some PowerPC target configurations. It is usable on all 64 bit targets as a callee save register. r? `@Amanieu`
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.