Job Noorman <jobnoorman@xxxxxxxxx> writes: >> ... it's just happenstance of how the compiler is written." > > No offense but I think that's a non-argument. You could use that to reject > any bug report. No, I can't. Here is the rule: when optimizing, you can use "i" if the expression is known to reduce to a constant. When not optimizing, the behaviour is unspecified: it will either work correctly or fail noisily. In other words, it just depends on how the compiler is written, and it may change in different releases. >> It's not a bug, because the compiler only promises to reduce an address to >> match the "i" constraint when optimizing. > > Where does it promise that? While asm constraints are under-documented, it's generally true that "r" always works for a value that fits in a register, and for anything else it depends. Ian
