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doc: document PCALIGN directive 

Fixes #64283

Change-Id: Ie0167410fc5557143f0b2e17af56ad9fe34605cf
GitHub-Last-Rev: 77144c76d38ca261b6728ba12ff128d22553efa5
GitHub-Pull-Request: golang/go#64296
Reviewed-on: https://go-review.googlesource.com/c/go/+/544115
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
changes/15/544115/8
Mauri de Souza Meneguzzo 2023-11-28 18:50:01 +00:00 committed by Gopher Robot
parent 7ccddf040a
commit 5df4a6376f
1 changed files with 17 additions and 0 deletions
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doc/asm.html
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@ -464,6 +464,23 @@ Function is the outermost frame of the call stack. Traceback should stop at this
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</ul>
<h3 id="special-instructions">Special instructions</h3>
<p>
The <code>PCALIGN</code> pseudo-instruction is used to indicate that the next instruction should be aligned
to a specified boundary by padding with no-op instructions.
</p>
<p>
It is currently supported on arm64, amd64, ppc64, loong64 and riscv64.
For example, the start of the <code>MOVD</code> instruction below is aligned to 32 bytes:
<pre>
PCALIGN $32
MOVD $2, R0
</pre>
</p>
<h3 id="data-offsets">Interacting with Go types and constants</h3>
<p>