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Author SHA1 Message Date
Stanislav Mekhanoshin 22ee191c3e DAG combine "and|or (select c, -1, 0), x" -> "select c, x, 0|-1" 
Allowed folding for "and/or" binops with non-constant operand if
arguments of select are 0/-1 values.

Normally this code with "and" opcode does not get to a DAG combiner
and simplified yet in the InstCombine. However AMDGPU produces it
during lowering and InstCombine has no chance to optimize it out.

In turn the same pattern with "or" opcode can reach DAG.

Differential Revision: https://reviews.llvm.org/D48301

llvm-svn: 335250
 2018-06-21 16:02:05 +00:00
Stanislav Mekhanoshin 20279dc025 Allow binop C1, (select cc, CF, CT) -> select folding 
Previously this folding was done only if select is a first operand.
However, for non-commutative operations constant may go before
select.

Differential Revision: https://reviews.llvm.org/D48223

llvm-svn: 335167
 2018-06-20 20:24:20 +00:00
Stanislav Mekhanoshin 9347c7b939 Tests for dag combine select (binop) -> select. NFC. 
Tests will be updated with https://reviews.llvm.org/D48223

llvm-svn: 334987
 2018-06-18 21:49:07 +00:00