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7 Commits

Author SHA1 Message Date
Simon Pilgrim 7fc6882374 [DAGCombiner] Add add/sub saturation undef handling 
Match ConstantFolding.cpp:
(add_sat x, undef) -> -1
(sub_sat x, undef) -> 0

llvm-svn: 351070
 2019-01-14 14:16:24 +00:00
Simon Pilgrim a367285f64 [X86] Add add/sub saturation undef tests. 
llvm-svn: 351066
 2019-01-14 13:47:07 +00:00
Simon Pilgrim cfa5f06dde [DAGCombiner] Enable add saturation constant folding 
llvm-svn: 351060
 2019-01-14 12:34:31 +00:00
Simon Pilgrim 67610926fc [DAGCombiner] Add add saturation constant folding tests. 
Exposes an issue with sadd_sat for computeOverflowKind, so I've disabled it for now.

llvm-svn: 351057
 2019-01-14 12:12:42 +00:00
Simon Pilgrim 56ba1db933 [DAGCombiner] If add_sat(x,y) can't overflow -> add(x,y) 
NOTE: We need more powerful signed overflow detection in computeOverflowKind
llvm-svn: 351026
 2019-01-13 22:08:26 +00:00
Simon Pilgrim 897d4c6fe9 [DAGCombiner] Some very basic add/sub saturation combines. 
Handle combines with zero and constant canonicalization for adds.

llvm-svn: 351024
 2019-01-13 21:50:24 +00:00
Simon Pilgrim 9961c55e28 [X86] Add some basic add/sub saturation combine tests. 
The actual combines will be added in a future commit.

llvm-svn: 351023
 2019-01-13 21:21:46 +00:00