Generate more efficient code for zero or sign extensions where
the source is a subvector generated via SHUFFLE_VECTOR.

Specifically, recognize patterns corresponding to (series of)
VECTOR UNPACK instructions, or the VECTOR SIGN EXTEND TO
DOUBLEWORD instruction.

As a special case, also handle zero or sign extensions of a
vector element to i128.

Fixes: https://github.com/llvm/llvm-project/issues/129576
Fixes: https://github.com/llvm/llvm-project/issues/129899

Since z13, the max group size will be 2 if any μop has more than 3 register
sources.

This has been ignored sofar in the SystemZHazardRecognizer, but is now
handled by recognizing those instructions and adjusting the tracking of
decoding and the cost heuristic for grouping.

Review: Ulrich Weigand
https://reviews.llvm.org/D49847

llvm-svn: 338368

As a consequence of recent discussions
(http://lists.llvm.org/pipermail/llvm-dev/2018-May/123164.html), this patch
changes the SystemZ SchedModels so that the IssueWidth is 6, which is the
decoder capacity, and NumMicroOps become the number of decoder slots needed
per instruction.

In addition, the SchedWrite latencies now match the MachineInstructions
def-operand indexes, and ReadAdvances have been added on instructions with
one register operand and one memory operand.

Review: Ulrich Weigand
https://reviews.llvm.org/D47008

llvm-svn: 337538

As part of the unification of the debug format and the MIR format, print
MBB references as '%bb.5'.

The MIR printer prints the IR name of a MBB only for block definitions.

* find . \( -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#" << ([a-zA-Z0-9_]+)->getNumber\(\)/" << printMBBReference(*\1)/g'
* find . \( -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#" << ([a-zA-Z0-9_]+)\.getNumber\(\)/" << printMBBReference(\1)/g'
* find . \( -name "*.txt" -o -name "*.s" -o -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#([0-9]+)/%bb.\1/g'
* grep -nr 'BB#' and fix

Differential Revision: https://reviews.llvm.org/D40422

llvm-svn: 319665

The machine scheduler (before register allocation) is enabled by default for
SystemZ.

The SelectionDAG scheduling preference now becomes source order scheduling
(was regpressure).

Review: Ulrich Weigand
https://reviews.llvm.org/D37977

llvm-svn: 315063

New SystemZ tests for the improved codegen of vector compare and select,
including cases with a logical combination of two compares.

Review: Ulrich Weigand.
https://reviews.llvm.org/D29489

llvm-svn: 298049