Could it be related to something like this perhaps?

Just for curiosity I tried

objdump -d C:\mingw64-w32\libexec\gcc\i686-w64-mingw32\4.6.3\cc1.exe > \Tmp\cc1-exe-objdump.txt

... and I found a lot of CMOVxx instructions that are likely to be missing in old processors (see here).

A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]

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