Displaying 2 results from an estimated 2 matches for "b1d03c47".
2012 Apr 17
0
[LLVMdev] InstCombine adds bit masks, confuses self, others
On Wed, Apr 18, 2012 at 12:22 AM, Jakob Stoklund Olesen <stoklund at 2pi.dk>wrote:
> 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:
>
I wonder about your idea of still combining most of the shifts, but leaving
the last bits uncombined...
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