Only require SSE2

Author: synesthesiam

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 3.2.0
+
+- Only require SSE2 on x86_64
+
 ## 3.1.0
 
 - Require SSE4.1 on x86_64

setup.py

@@ -121,10 +121,9 @@ def new_compile(obj, src, ext, cc_args, extra_postargs, pp_opts):
     libraries = []
 
     if arch == "x86":
-        # Assume SSE4.2 baseline
+        # Assume SSE2 baseline
         extra_compile_args += [
-            "-msse4.2",  # enables SSE2/SSE3/SSSE3/SSE4.1 as well
-            "-mpopcnt",  # part of the de-facto x86-64-v2 baseline
+            "-msse2",
             "-mtune=generic",  # good across Intel/AMD
         ]