Grant> If so, then gcc or the code gen backend should generate a
Grant> warning about overflowing the encoding. This sounds like a
Grant> toolchain bug.
gcc does generate a warning for constant shifts that are too big, as in:
bit = 1ull << 64;
No diagnostic is generated when the shift is a variable, as in
bit = 1ull << shift;
If at runtime, shift is bigger than the width of the unsigned long
long type, then this expression is undefined according to the C spec.
So the gcc behavior is perfectly correct.
- R.
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