| From: | Andreas Seltenreich <seltenreich(at)gmx(dot)de> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | [PATCH] Improve spinlock inline assembly for x86. |
| Date: | 2016-01-17 11:38:26 |
| Message-ID: | 87oack5tcd.fsf@credativ.de |
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| Lists: | pgsql-hackers |
Hi,
I'm currently experimenting with just-in-time compilation using libfirm.
While discussing issues with its developers, it was pointed out to me
that our spinlock inline assembly is less than optimal. Attached is a
patch that addresses this.
,----
| Remove the LOCK prefix from the XCHG instruction. Locking is implicit
| with XCHG and the prefix wastes a byte. Also remove the "cc" register
| from the clobber list as the XCHG instruction does not modify any flags.
|
| Reported by Christoph Mallon.
`----
regards,
Andreas
| Attachment | Content-Type | Size |
|---|---|---|
| 0001-Improve-spinlock-inline-assembly-for-x86.patch | text/x-diff | 1.1 KB |
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