Optimiser bug in GCC 4.0.4

By: on June 16, 2006

Q: When is (i != 0) equivalent to

((i >= 0) && ((i >= -1073741824) && (i < 1073741824))) ? A: When GCC 4.0.4’s -O, -O1, -O2 or -O3 is used on it.

See GCC bug 28042. Particularly interesting is that removing the redundant set of parentheses around the second && avoids the optimiser bug.

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