[PATCH] D155986: [clang][AMDGPU]: Don't use byval for struct arguments in function ABI

[Jon Chesterfield via Phabricator via llvm-commits]

JonChesterfield added a comment.

We do not have a defined ABI. We do not have machine code linking. Calling functions from assembly requires considerable care already. We change things like which registers are live per-function.

The time will come where we are sufficiently constrained to be stuck with inefficiency in calling convention but we are not there yet. Other languages that want to link against IR emitted by clang can still do so, though they'll also need to change to the more efficient convention to do so.


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https://reviews.llvm.org/D155986