Hello all, This program has a strange behaviour, probably due to FP optimizations using the -O1 or -O2 or -O3 (I can resolve it with the GCC compilation flag -ffloat-store). It should produce the same output twice (because it prints the same variable in 2 consecutive lines), but it does not; there are some errors on the last digits. Someone can explain me what happen? Source: http://old.nabble.com/file/p33858981/bug.c bug.c Compile: gcc -O3 -o bug bug.c Output: 132.316432 132.316437 108.085940 108.085938 134.695360 134.695358 123.992232 123.992233 I tested it with the following systems: Intel i5, Ubuntu Linaro, kernel 3.0.0-19-generic, GCC 4.6.1-9ubuntu3 Intel i7, Ubuntu Linaro, kernel 2.6.38-15-generic, GCC 4.5.2-8ubuntu4 -- View this message in context: http://old.nabble.com/Unexpected-behaviour-printing-twice-the-same-variable-tp33858981p33858981.html Sent from the gcc - Help mailing list archive at Nabble.com.
