The implementation of the functions __absv?i2(), __addv?i3() etc. for trapping integer overflow provided in libgcc2.c is rather bad. Same for __cmp?i2() and __ucmp?i2()
GCC creates awful to horrible code for them (at least for AMD64 and i386 processors): see <https://skanthak.homepage.t-online.de/gcc.html> for some examples. The attached diff/patch provides better implementations. Stefan
libgcc2.diff
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