[PATCH] D153742: [RISCV] Add Zce extension.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a subscriber: Nelson1225.
craig.topper added a comment.

In D153742#4449614 <https://reviews.llvm.org/D153742#4449614>, @asb wrote:

> Looking at the PDF, the behaviour I feel is slightly unclear is for RV64 with F and with Zce. You've chosing in this patch to allow it but to just not include zcf, though by my first reading of the spec I probably would have errored on the basis that "Specifying Zce with F includes Zca, Zcb, Zcmp, Zcmt and Zcf" and Zcf on RV64 is of course illegal. I think we have some leeway in how we handle this, but do you happen to know if GCC does something similar?

I don't know what gcc does. I tried godbolt with "compile to binary" enabled. binutils rejected all of the Zc* extensions.

@Nelson1225 can you provide any information about what binutils does or will do?


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