GCC miscompiles Fp2 with --opt:size flag about constantine HOT 1 CLOSED

Following further investigation in #230, I believe that the compiler finds out that M is a constant by constant folding through compilation units with LTO and generating new procedures with only the variable input
As the inline assembly directly use the pointer as an input register, it's likely that its value has been hardcoded. This wouldn't be a problem if the address of the constant didn't change but who knows what the linker does (and there is relocatable code and Address Space Layout Randomization as well)

from constantine.