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Author SHA1 Message Date
Jonas Paulsson 4645711a8d [SystemZ] Improve handling and cost estimates of vector integer div/rem 
Enable the DAG optimization that converts vector div/rem with constants into
multiply+shifts sequences by expanding them early. This is needed since
ISD::SMUL_LOHI is 'Custom' lowered on SystemZ, and will therefore not be
available to BuildSDIV after legalization.

Better cost values for these instructions based on how they will be
implemented (a constant divisor is cheaper).

Review: Ulrich Weigand
https://reviews.llvm.org/D53196

llvm-svn: 345321
 2018-10-25 21:47:22 +00:00
Jonas Paulsson bf66f38705 [SystemZ] Temporarily disable high VFs with integer div/rem. 
Until mischeduler is clever enough to avoid spilling in a vectorized loop
with many (scalar) DLRs it is better to avoid high vectorization factors (8
and above).

llvm-svn: 344129
 2018-10-10 09:30:29 +00:00
Jonas Paulsson fccc7d66c3 [SystemZ] TargetTransformInfo cost functions implemented. 
getArithmeticInstrCost(), getShuffleCost(), getCastInstrCost(),
getCmpSelInstrCost(), getVectorInstrCost(), getMemoryOpCost(),
getInterleavedMemoryOpCost() implemented.

Interleaved access vectorization enabled.

BasicTTIImpl::getCastInstrCost() improved to check for legal extending loads,
in which case the cost of the z/sext instruction becomes 0.

Review: Ulrich Weigand, Renato Golin.
https://reviews.llvm.org/D29631

llvm-svn: 300052
 2017-04-12 11:49:08 +00:00