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64703c36
2012 Apr 17
0
[LLVMdev] InstCombine adds bit masks, confuses self, others
...ith the fix, demanded bits might need adjusting
to cope with the pattern.
But this is all theorizing. =] The actually regressions will likely tell
more.
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2012 Apr 17
2
[LLVMdev] InstCombine adds bit masks, confuses self, others
On Apr 16, 2012, at 3:30 PM, Chandler Carruth <chandlerc at google.com> wrote:
> Does sinking these into the DAGCombine layer help? How much does it break?
I tried disabling just the InstCombine transforms that hide shl instructions behind bitmasks. Even though DAGCombine has the same transforms, it causes some pretty bad regressions:
External/SPEC/CINT95/147_vortex/147_vortex