Bug 253436

Summary:	vex amd64->IR: unhandled instruction bytes: 0xF2 0xA6 (repne cmps)
Product:	[Developer tools] valgrind	Reporter:	Vince Weaver <vince>
Component:	vex	Assignee:	Julian Seward <jseward>
Status:	REPORTED ---
Severity:	normal	CC:	jacobly.alt, pjfloyd
Priority:	NOR
Version:	3.6 SVN
Target Milestone:	---
Platform:	Unlisted Binaries
OS:	Linux
Latest Commit:		Version Fixed In:
Bug Depends on:
Bug Blocks:	253451
Attachments:	Added missing cmps variants to VEX amd64.

Description Vince Weaver 2010-10-06 23:26:23 UTC

Version:           3.6 SVN
OS:                Linux

The "repne cmps" string instruction is not supported on amd64

Reproducible: Didn't try

Comment 1 jacobly.alt 2020-01-10 17:53:37 UTC

Created attachment 125021 [details]
Added missing cmps variants to VEX amd64.

I was trying to run valgrind on some assembly code and it also chokes on a plain old cmps.  I implemented both in the attached patch.

Comment 2 Paul Floyd 2021-11-22 11:12:12 UTC

Do you have a testcase for this?