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| author | Ulrich Weigand <ulrich.weigand@de.ibm.com> | 2018-01-19 20:56:04 +0000 |
|---|---|---|
| committer | Ulrich Weigand <ulrich.weigand@de.ibm.com> | 2018-01-19 20:56:04 +0000 |
| commit | 426f6bef44c3ad0ff4bc26713979fe0c2dbb682d (patch) | |
| tree | f72f89408937a68f95bf6dea3f377f2f86fe7dc3 /llvm/lib/Target | |
| parent | 31112895d966ccd5a3098866f0826a789d36f3b7 (diff) | |
| download | bcm5719-llvm-426f6bef44c3ad0ff4bc26713979fe0c2dbb682d.tar.gz bcm5719-llvm-426f6bef44c3ad0ff4bc26713979fe0c2dbb682d.zip | |
[SystemZ] Prefer LOCHI over generating IPM sequences
On current machines we have load-on-condition instructions that can be
used to directly implement the SETCC semantics. If we have those, it is
always preferable to use them instead of generating the IPM sequence.
llvm-svn: 322989
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp index f12147cf3ea..81175013ed2 100644 --- a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp +++ b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp @@ -1583,6 +1583,11 @@ SDValue SystemZDAGToDAGISel::expandSelectBoolean(SDNode *Node) { } void SystemZDAGToDAGISel::PreprocessISelDAG() { + // If we have conditional immediate loads, we always prefer + // using those over an IPM sequence. + if (Subtarget->hasLoadStoreOnCond2()) + return; + bool MadeChange = false; for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(), |
