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This is intended for 68060: - GCC does not emit __muldi3() for 68020-40, that have 32 * 32 --> 64 mulul - mulsl (and moveml), used in this code, are not implemented for 68010 In comparison with that from compiler_rt, this version saves: - 12% of processing time - 12 bytes of stack - 50 bytes of code size Also, slightly faster, memory saving, and smaller than libgcc version. By examining with evcnt(9), __muldi3() is invoked more than 1000 times per sec by kernel, which should justify to introduce assembler version of this function. |
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