squeezed another percent or so out of the interpreter (I need to test this...

squeezed another percent or so out of the interpreter (I need to test this stuff on an athlon processor!)

Rev: src/code/README.txt:1.6
Rev: src/code/ia32.c:1.9
Rev: src/code/ia32.h:1.7
Rev: src/docode.c:1.126
Rev: src/docode.h:1.13
Rev: src/las.c:1.260
Rev: src/peep.c:1.64