Bug 318773 - unhandled instruction bytes: 0xF3 0x48 0x0F 0xBC 0xC2 0xC3 0x66 0x0F
Summary: unhandled instruction bytes: 0xF3 0x48 0x0F 0xBC 0xC2 0xC3 0x66 0x0F
Status: RESOLVED DUPLICATE of bug 295808
Alias: None
Product: valgrind
Classification: Developer tools
Component: vex (show other bugs)
Version: 3.8.0
Platform: FreeBSD Ports FreeBSD
: NOR normal
Target Milestone: ---
Assignee: Julian Seward
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-04-23 17:19 UTC by Yuri
Modified: 2013-04-25 07:05 UTC (History)
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Description Yuri 2013-04-23 17:19:18 UTC 
I got this error while running code compiled with gcc-4.8.0 under helgrind:
------
vex amd64->IR: unhandled instruction bytes: 0xF3 0x48 0xF 0xBC 0xC2 0xC3 0x66 0xF
vex amd64->IR:   REX=1 REX.W=1 REX.R=0 REX.X=0 REX.B=0
vex amd64->IR:   VEX=0 VEX.L=0 VEX.nVVVV=0x0 ESC=0F
vex amd64->IR:   PFX.66=0 PFX.F2=0 PFX.F3=1
------

Disassembling the same place yields thes instructions:
  c055b4:       f3 48 0f bc c2          repz bsf %rdx,%rax
  c055b9:       c3                      retq   
  c055ba:       66 0f 1f 44 00 00       nopw   0x0(%rax,%rax,1)

So  "f3 48 0f bc c2          repz bsf %rdx,%rax" is unhandled.


Reproducible: Always
Comment 1 Yuri 2013-04-24 03:31:38 UTC 
Same instruction is also mentioned in this Bug: https://bugs.kde.org/show_bug.cgi?id=295808
Comment 2 Yuri 2013-04-25 07:05:53 UTC 

*** This bug has been marked as a duplicate of bug 295808 ***