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11 Commits

Author SHA1 Message Date
Amaury Sechet 8ac81f3924 Do not legalize large add with addc/adde, introduce addcarry and do it with uaddo/addcarry 
Summary: As per discution on how to get better codegen an large int legalization, it became clear that using a glue for the carry was preventing several desirable optimizations. Passing the carry down as a value allow for more flexibility.

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

Subscribers: igorb, llvm-commits

Differential Revision: https://reviews.llvm.org/D29872

llvm-svn: 301775
 2017-04-30 19:24:09 +00:00
Amaury Sechet 62e0759d56 [SelectionDAG] Make SelectionDAG aware of the known bits in USUBO and SSUBO and SUBC. 
Summary:
Depends on D30379

This improves the state of things for the sub class of operation.

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

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D30436

llvm-svn: 297482
 2017-03-10 17:26:44 +00:00
Amaury Sechet 69fa16c810 [SelectionDAG] Make SelectionDAG aware of the known bits in UADDO and SADDO. 
Summary: As per title. This is extracted from D29872 and I threw SADDO in.

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

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D30379

llvm-svn: 297479
 2017-03-10 17:06:52 +00:00
Amaury Sechet 5a605fc6c6 Add test case for computing known bits of substraction operations. NFC 
llvm-svn: 296417
 2017-02-28 00:15:13 +00:00
Amaury Sechet 7bda8cdef2 Add test for known bits in uaddo and saddo. 
llvm-svn: 296255
 2017-02-25 15:58:34 +00:00
Amaury Sechet 4b946916ac [DAGCombiner] Push truncate through adde when the carry isn't used. 
Summary: As per title.

Reviewers: mkuper, spatel, bkramer, RKSimon, zvi

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29528

llvm-svn: 294394
 2017-02-08 00:32:36 +00:00
Amaury Sechet e674f5c758 Add ADDC to SelectionDAG::computeKnownBits and ComputeNumSignBits. 
Summary: As per title.

Reviewers: bkramer, sunfish, lattner, RKSimon

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29521

llvm-svn: 294188
 2017-02-06 14:59:06 +00:00
Simon Pilgrim b070ce8270 [X86] Add add/addc known-bits tests (D29521) 
llvm-svn: 294184
 2017-02-06 14:06:57 +00:00
Simon Pilgrim 1e4d870999 [X86][SSE] Add support for combining AND bitmasks to shuffles. 
llvm-svn: 288365
 2016-12-01 15:41:40 +00:00
Simon Pilgrim daf82f5f33 [X86][SSE] Regenerated known-bits test with srem->urem fix 
llvm-svn: 285124
 2016-10-25 21:24:33 +00:00
Simon Pilgrim 153b408433 [SelectionDAG] Ensure DAG::getZeroExtendInReg is called with a scalar type 
Fixes issue with rL280927 identified by Mikael Holmén

llvm-svn: 281042
 2016-09-09 13:31:52 +00:00