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On Mon, Oct 12, 2009 at 6:15 PM, Villmow, Micah <Micah.Villmow at amd.com> wrote: > I have a test case(attached as fc_long.ll) that when run through the > optimizer produces 65bit integer math(fc_long-opt.ll). > > > > Now I understand that llvm can have any length integer, but I consider > turning a 64bit mul into multiple 65 bit instructions to be a ‘bad’ >

I have a test case(attached as fc_long.ll) that when run through the optimizer produces 65bit integer math(fc_long-opt.ll). Now I understand that llvm can have any length integer, but I consider turning a 64bit mul into multiple 65 bit instructions to be a 'bad' optimization. This eventually expands to a 128bit multiply call(__multi3) which I have absolutely no interest in supporting.

...ndvars, or in SCEV, or is this just a natural limitation of SCEV? -------------- next part -------------- A non-text attachment was scrubbed... Name: fc_long.ll Type: application/octet-stream Size: 1593 bytes Desc: not available URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20091012/932523ab/attachment.obj>