diff options
Diffstat (limited to 'py')
| -rw-r--r-- | py/py.mk | 8 |
1 files changed, 8 insertions, 0 deletions
@@ -162,3 +162,11 @@ $(PY_BUILD)/gc.o: CFLAGS += $(CSUPEROPT) # optimising vm for speed, adds only a small amount to code size but makes a huge difference to speed (20% faster) $(PY_BUILD)/vm.o: CFLAGS += $(CSUPEROPT) +# Optimizing vm.o for modern deeply pipelined CPUs with branch predictors +# may require disabling tail jump optimization. This will make sure that +# each opcode has its own dispatching jump which will improve branch +# branch predictor efficiency. +# http://article.gmane.org/gmane.comp.lang.lua.general/75426 +# http://hg.python.org/cpython/file/b127046831e2/Python/ceval.c#l828 +# http://www.emulators.com/docs/nx25_nostradamus.htm +#-fno-crossjumping |