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Message-Id: <670761BD-D04A-4F3E-84F9-9AA6F66FB9FD@gmail.com>
Date: Tue, 12 Jan 2016 17:49:03 -0500
From: Mark Mossberg <mark.mossberg@...il.com>
To: musl@...ts.openwall.com
Subject: Possible redundant `mov` in i386/x86_64 longjmp()?

Hi all,

I was recently perusing musl’s implementation of longjmp() for i386 and I saw that esp was restored via:

	mov 16(%edx),%ecx
	mov     %ecx,%esp

To me, it seems like the intermediary mov to %ecx is unnecessary. Could the code instead be the following?

	mov 16(%edx), %esp

Thanks,
Mark

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