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[jte]

It seems to be due to excessive compiler "optimization". This can easily be an issue when relying on precise floating-point semantics. (Compiler writers have a hard time avoiding the temptation to generate machine code that doesn't precisely match up with IEEE 754 + C++ semantics.) It is a better-recognized problem now than it used to be (in the past, getting some compilers to actually produce correct floating-point code could require substantial gymnastics with the source code), so hopefully it won't be too hard to get the compiler to produce object code that better matches up with the source code.