https://bugs.kde.org/show_bug.cgi?id=386851
Bug ID: 386851
Summary: Please add support for CPUID override
Product: valgrind
Version: 3.13.0
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: bugzi...@poradnik-webmastera.com
Target Milestone: ---
Please allow to override CPUID values. This would be helpful to test apps which
has few versions of code, and selects one of them at runtime after checking
data returned by CPUID. Second use case is to simulate code with instructions
which are not supported natively by CPU, e.g. to test code which uses AVX512 on
some non-AVX512 CPU.
Simulation of CPUs with less features should be pretty straightforward to
implement. Adding new features may be more complex, if VG internally delegates
instruction execution to real CPU - it would have to simulate them in software.
To make this feature easy to use, VG should provide predefined CPUID profiles
for various CPUs, e.g. like Intel SDE does (link below). You can also add
separate option(s) to fine-tune CPUID data, some users may find this useful
too.
https://software.intel.com/en-us/articles/intel-software-development-emulator#BASIC
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