derrickturk · March 21, 2014 22:06
diff --git a/gistfile1.txt b/gistfile1.txt
 Public service announcement: use extreme caution when compiling under g++ with -msseX and returning a std::pair<double, double>, or the structural equivalent, by value. It will optimize to a movapd, which works wonderfully as long as you're returning into a 16-bit aligned address. But you'll mysteriously explode in a shower of body parts if calling into, say, a DLL from external code (say, Excel VBA) with a less-strictly aligned stack.

 No, I didn't just spend 5 hours tracking that one down...
	Public service announcement: use extreme caution when compiling under g++ with -msseX and returning a std::pair<double, double>, or the structural equivalent, by value. It will optimize to a movapd, which works wonderfully as long as you're returning into a 16-bit aligned address. But you'll mysteriously explode in a shower of body parts if calling into, say, a DLL from external code (say, Excel VBA) with a less-strictly aligned stack.

	No, I didn't just spend 5 hours tracking that one down...