| commit | 18d0e6a14f0de7fe1a32799f3d0982c274b3c091 | [log] [tgz] |
|---|---|---|
| author | David Chase <drchase@google.com> | Tue Apr 02 11:12:44 2024 -0400 |
| committer | David Chase <drchase@google.com> | Wed May 15 15:44:14 2024 +0000 |
| tree | ef0772e1c1cb0d1ebfad1d05c2c9ce9da5d710a1 | |
| parent | 31c81500828993d99af3392742abde64194da858 [diff] |
cmd/compile, cmd/internal: fine-grained fiddling with loop alignment This appears to be useful only on amd64, and was specifically benchmarked on Apple Silicon and did not produce any benefit there. This CL adds the assembly instruction `PCALIGNMAX align,amount` which aligns to `align` if that can be achieved with `amount` or fewer bytes of padding. (0 means never, but will align the enclosing function.) Specifically, if low-order-address-bits + amount are greater than or equal to align; thus, `PCALIGNMAX 64,63` is the same as `PCALIGN 64` and `PCALIGNMAX 64,0` will never emit any alignment, but will still cause the function itself to be aligned to (at least) 64 bytes. Change-Id: Id51a056f1672f8095e8f755e01f72836c9686aa3 Reviewed-on: https://go-review.googlesource.com/c/go/+/577935 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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