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4 Commits

Author SHA1 Message Date
Amaury Sechet 77cfb4a85f [DAGCombine] (addcarry 0, 0, X) -> (ext/trunc X) 
Summary:
While this makes some case better and some case worse - so it's unclear if it is a worthy combine just by itself - this is a useful canonicalisation.

As per discussion in D32756 .

Reviewers: jyknight, nemanjai, mkuper, spatel, RKSimon, zvi, bkramer

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32916

llvm-svn: 303441
 2017-05-19 18:20:44 +00:00
Amaury Sechet 71f511fd1e [DAGCombiner] mulhi + 1 never overflow. 
Summary:
This can be used to optimize large multiplications after legalization.

Depends on D29565

Reviewers: mkuper, spatel, RKSimon, zvi, bkramer, aaboud, craig.topper

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29587

llvm-svn: 296711
 2017-03-01 23:44:17 +00:00
Amaury Sechet 683f5743f6 Improve mulhi overflow test. NFC 
llvm-svn: 296709
 2017-03-01 23:31:19 +00:00
Amaury Sechet 250b4a7491 Add test case for mulhi's overflow. NFC 
llvm-svn: 296696
 2017-03-01 22:27:21 +00:00