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# 82099457 29-Apr-2019 Bjorn Pettersson <[email protected]>

[DAG] Refactor DAGCombiner::ReassociateOps

Summary:
Extract the logic for doing reassociations
from DAGCombiner::reassociateOps into a helper
function DAGCombiner::reassociateOpsCommutative,
and use

[DAG] Refactor DAGCombiner::ReassociateOps

Summary:
Extract the logic for doing reassociations
from DAGCombiner::reassociateOps into a helper
function DAGCombiner::reassociateOpsCommutative,
and use that helper to trigger reassociation
on the original operand order, or the commuted
operand order.

Codegen is not identical since the operand order will
be different when doing the reassociations for the
commuted case. That causes some unfortunate churn in
some test cases. Apart from that this should be NFC.

Reviewers: spatel, craig.topper, tstellar

Reviewed By: spatel

Subscribers: dmgreen, dschuff, jvesely, nhaehnle, javed.absar, sbc100, jgravelle-google, hiraditya, aheejin, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61199

llvm-svn: 359476

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# f9ab4f5f 18-Mar-2019 Simon Pilgrim <[email protected]>

[SystemZ] Remove icmp undef from reduced tests

Pre-commit for D59363 (Add icmp UNDEF handling to SelectionDAG::FoldSetCC)

Approved by @uweigand (Ulrich Weigand)

llvm-svn: 356368


Revision tags: llvmorg-8.0.0
# 5bcd59bc 14-Mar-2019 Simon Pilgrim <[email protected]>

[SystemZ] Regenerate tests to make complete codegen more obvious

llvm-svn: 356137


Revision tags: llvmorg-8.0.0-rc5, llvmorg-8.0.0-rc4, llvmorg-8.0.0-rc3, llvmorg-7.1.0, llvmorg-7.1.0-rc1, llvmorg-8.0.0-rc2
# 8cda83a5 06-Feb-2019 Jonas Paulsson <[email protected]>

[SystemZ] Wait with VGBM selection until after DAGCombine2.

Don't lower BUILD_VECTORs to BYTE_MASK, but instead expose the BUILD_VECTORs
to the DAGCombiner and select them to VGBM in Select(). This

[SystemZ] Wait with VGBM selection until after DAGCombine2.

Don't lower BUILD_VECTORs to BYTE_MASK, but instead expose the BUILD_VECTORs
to the DAGCombiner and select them to VGBM in Select(). This allows the
DAGCombiner to understand the constant vector values.

For floating point, only all-zeros vectors are now generated with VGBM, as it
turned out to be somewhat complicated to handle any arbitrary constants,
while in practice this is very rare and hardly needed.

The SystemZ ISD opcodes z_byte_mask, z_vzero and z_vones have been removed.

Review: Ulrich Weigand
https://reviews.llvm.org/D57152

llvm-svn: 353325

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