[issue4753] Faster opcode dispatch on gcc

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Benchmarking pitrou_dispatch_2.7.patch applied to trunk r68522 on a 32-
bit Efficeon (x86) using gcc 4.2.4-1ubuntu3 yields a 10% pybench 
speedup.

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