[Bug target/59952] -march=core-avx2 should not enable RTM

[thiago at kde dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59952

--- Comment #8 from Thiago Macieira <thiago at kde dot org> ---
(In reply to Thiago Macieira from comment #7)
> (In reply to Jakub Jelinek from comment #6)
> > Prerelease samples shouldn't count, people using those just can avoid using
> > -march=haswell and use -march=ivybridge -mavx2 or similar instead.  Can
> > anyone from Intel verify if all released Haswell CPUs have BMI2 (and if
> > there aren't plans to ship Haswell CPUs without BMI2)?
> 
> Trying to get that confirmed internally.

First info is that the i3-4000 series has BMI2:

 Family: Core i3
 Version: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz
 flags    :  .... fsgsbase bmi1 avx2 smep bmi2 erms invpcid

The other information that I can give you is that compiling code with ICC 14
with -march=core-avx2 does generate SHRX, SARX, SHLX instructions. It has no
#define for either BMI1 or 2, though.