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checksumming. These bugs could possibly cause bad code to be generated at elevated optimization levels. First, eliminate the use of preprocessor magic to form the address fields of asm instructions. It hid the actual addresses being referenced from the compiler. Without knowledge of all the data dependencies, the compiler might possibly use optimizations which would result in incorrect code. Use "__asm __volatile" rather than "__asm" for instruction sequences that pass information through the condition codes (the carry bit, in this case). Without __volatile, the compiler might add unrelated code between consecutive __asm instructions, modifying the condition codes. I have seen GCC insert stack pointer adjustments in this way, for example. Unfortunately, GCC doesn't provide a way to specify dependencies on the condition codes. You can specify that they are clobbered, but not that you are going to use them as input. Finally, simplify the LOAD macro. This macro is used as a poor man's prefetch. The simpler version gives the compiler more leeway about just how it performs the prefetch. MFC after: 1 week
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