[PATCH] [NoTTI] reject negative scale in addressing mode

[Andrew Trick]

Please add comments explaining the behavior that you discovered and rationale. Are you just trying to avoid considering reg - reg to be free, or can scale be < -1?

You should be able to test LSR now with opt -loop-reduce and specifying TTI. I'm not sure off the top of my head the best way to specify TTI, but -mtriple probably works.

Otherwise looks good. Thanks for the fix.


http://reviews.llvm.org/D9536

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