Re: [Valgrind-users] Valgrind and glibc's CPU detection

[Julian S. <js...@ac...>]

You need to say what CPU this is on.  For x86_64 I think this is
impossible, because all x86_64 processors support at least SSE2.

For x86 (32 bit) this might just be possible.  In VEX/priv/guest_x86_toIR.c,
find the code that handles CPUID

      case 0xA2: { /* CPUID */

and change it so that it uses this case

         if (archinfo->hwcaps == 0/*no SSE*/) {
            fName = "x86g_dirtyhelper_CPUID_sse0";
            fAddr = &x86g_dirtyhelper_CPUID_sse0;
         } else

J


On 09/23/2014 11:44 AM, Konstantin Tokarev wrote:
> Hi all,
> 
> I'd like to prevent glibc from using any SIMD-optimized functions when running 
> application under Valgrind on Linux. Is it possible to do now?
> AFAIU, glibc uses runtime CPU detection, and Valgrind runs code on emulated CPU.
>