Any chance to see AVX build sometime ?
Same answer, except I lost that configuration so it would help if you open about:buildconfig and post the optimization I used. IIRC, it was -march=sandybridge.
Build platform
target
i386-pc-os2-emx
Build tools
Compiler Version Compiler flags
gcc.exe 5.5.0 -Wall -Wempty-body -Wpointer-to-int-cast -Wsign-compare -Wtype-limits -Wno-unused -Wcast-align -Zomf -std=gnu99 -fgnu89-inline -fno-strict-aliasing -Zomf -fno-math-errno -pthread
c++ 5.5.0 -idirafter g:/OS2TK45/h -Wall -Wempty-body -Woverloaded-virtual -Wsign-compare -Wwrite-strings -Wno-invalid-offsetof -Wcast-align -fno-exceptions -fno-strict-aliasing -Zomf -fno-rtti -fno-exceptions -fno-math-errno -std=gnu++0x -pthread -DNDEBUG -DTRIMMED -g -march=sandybridge -O2 -fomit-frame-pointer
Configure arguments
--enable-application=browser '--enable-optimize=-march=sandybridge -O2' --disable-debug --enable-debug-symbols --disable-tests --enable-os2-high-mem --without-x --enable-system-cairo --enable-system-pixman --with-intl-api --with-system-icu --with-system-zlib --with-system-nss --with-system-nspr --with-system-libvpx --disable-startupcache