Bug 424248 - Doesn't support CLFLUSHOPT instruction
Summary: Doesn't support CLFLUSHOPT instruction
Status: REPORTED
Alias: None
Product: valgrind
Classification: Developer tools
Component: vex (other bugs)
Version First Reported In: unspecified
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Julian Seward
URL:
Keywords:
: 456948 (view as bug list)
Depends on:
Blocks:
 
Reported: 2020-07-15 18:27 UTC by d.c.ddcc
Modified: 2022-07-20 18:48 UTC (History)
2 users (show)

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Description d.c.ddcc 2020-07-15 18:27:11 UTC 
Tested with Valgrind 3.16.1

STEPS TO REPRODUCE
1. Execute a program that uses the CLFLUSHOPT instruction

OBSERVED RESULT
vex amd64->IR: unhandled instruction bytes: 0x66 0xF 0xAE 0x3C 0x25 0xE0 0x1 0x0 0x70 0xC3
vex amd64->IR:   REX=0 REX.W=0 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=1 PFX.F2=0 PFX.F3=0
Comment 1 d.c.ddcc 2020-07-15 18:28:24 UTC 
For reference, this is the corresponding disassembly:

   1531c:       66 0f ae 3c 25 e0 01    clflushopt 0x700001e0
   15323:       00 70
Comment 2 Mark Wielaard 2021-02-20 22:20:52 UTC 
Note that you should check first with the cpuid feature flag CLFLUSHOPT whether the instruction is supported or not (valgrind doesn't set it).
Comment 3 Mark Wielaard 2022-07-20 18:48:26 UTC 
*** Bug 456948 has been marked as a duplicate of this bug. ***