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This feature was controlled by the compilation flag `OPDISP` which would enable some bits of assembler on the x86 (ISC or DOS) or some other specialized code on SPARC. On SPARC hardware, there was a special compilation process that would preprocess the code and generate dispatch tables. We do this now when this feature is enabled using gcc's computed gotos feature. This is available in clang and some other compilers. Notably, it isn't present in Visual Studio. This doesn't decrease our portability at all as this feature is optional and it replaces specialized assembler code with C using compiler extensions (making it cross-platform). In doing this, we've removed a bunch of related code, however, it is likely that other pieces yet remain and will be removed in subsequent commits as we clean things up and refine them. This feature remains disabled by default for now.
FILES USED IN THIS DIRECTORY config.guess config.sub taken from GNU project's "config" directory, on prep.ai.mit.edu/pub/gnu/config. Update 'em as needed.