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doc/asm: add BP is callee-save paragraph

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Change-Id: Id38e639c66a42acf0b1c4488cdfd0b7b6cf71c78
Reviewed-on: https://go-review.googlesource.com/c/go/+/250397
Reviewed-by: Keith Randall <khr@golang.org>
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Egon Elbre 2020-08-25 10:38:50 +03:00 committed by Keith Randall
parent 4d89b3231d
commit d7a6a44deb
1 changed files with 7 additions and 0 deletions
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doc/asm.html
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@ -687,6 +687,13 @@ MOVQ g(CX), AX // Move g into AX.
MOVQ g_m(AX), BX // Move g.m into BX.
</pre>
<p>
Register <code>BP</code> is callee-save.
The assembler automatically inserts <code>BP</code> save/restore when frame size is larger than zero.
Using <code>BP</code> as a general purpose register is allowed,
however it can interfere with sampling-based profiling.
</p>
<h3 id="arm">ARM</h3>
<p>