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Author SHA1 Message Date
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