[LLVMdev] [PATCH] Detect Haswell subarchitecture (i.e. using -march=native)

Adam Strzelecki ono at java.pl
Thu Sep 12 08:17:18 PDT 2013


This is my first patch on this list, however I've already submitted several trough bug tracking system. Since it probably needs some review and it's not a bug I am submitting it here.

The main intent of this patch is to detect "core-avx2" platform on Haswell i7 CPUs when running -march=native. Currently it detects it as generic x86_64.

* Haswell is detected for CPUID Family 6 Model 60
* Similar to Ivy and Sandy Bridge we check for AVX2 since some Haswell Pentiums are SSE4.x only
* I have marked HasAVX2 as "volatile", since otherwise it gets magically zeroed (by optimizer?) when compiling clang with latest clang build from trunk

* Also enabling X86::FeatureFastUAMem for Haswell

Adam Strzelecki | nanoant.com | twitter.com/nanoant
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