Document ppc inline asm support #2056
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Mark status and sticky bits of vscr, fpscr and spefscr as being preserved when using the `preserves_flags` option. These are not enforced by codegen today, but might be in future LLVM releases.
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| r[asm.rules.stack-above-sp] | ||
| - Unless the `nostack` option is set, assembly code is allowed to modify the caller's stack frame in specific cases. | ||
| - The target ABI requires storing certain values in the caller's frame (e.g saving the `lr` on PowerPC64) |
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Is this meaning to say:
When the
nostackoption is not set, assembly code is allowed to modify the caller's stack frame if and only if the target ABI requires storing values in the caller's frame (e.g., saving thelron PowerPC64).
?
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This PR is a sub-part of rust-lang/rust#147996.
r? @Amanieu