| commit | a538b59fd2428ba4d13f296d7483febf2fc05f97 | [log] [tgz] |
|---|---|---|
| author | Austin Clements <austin@google.com> | Tue Sep 01 11:21:50 2020 -0400 |
| committer | Austin Clements <austin@google.com> | Thu Sep 03 12:55:47 2020 +0000 |
| tree | 5f1e5c14701765ae64173551edda7b94dc91532c | |
| parent | 2b8b06ebbf0198d3c7a9b4d839bc05d9b13ecbe7 [diff] |
cmd/go: define an asm macro for GOEXPERIMENT=regabi This defines a macro for the regabi GOEXPERIMENT when assembling runtime assembly code. In general, assembly code will be shielded from the calling convention change, but there is a small amount of runtime assembly that is going to have to change. By defining a macro, we can easily make the small necessary changes. The other option is to use build tags, but that would require duplicating nontrivial amounts of unaffected code, leading to potential divergence issues. (And unlike Go code, assembly code can't depend on the compiler optimizing away branches on a feature constant.) We consider the macro preferable, especially since this is expected to be temporary as we transition to the new calling convention. Updates #40724. Change-Id: I73984065123968337ec10b47bb12c4a1cbc07dc5 Reviewed-on: https://go-review.googlesource.com/c/go/+/252258 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
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