Remove check for single use in ShrinkDemandedConstant
This removes check for single use from general ShrinkDemandedConstant
to the BE because of the AArch64 regression after D56289/rL350475.
After several hours of experiments I did not come up with a testcase
failing on any other targets if check is not performed.
Moreover, direct call to ShrinkDemandedConstant is not really needed
and superceed by SimplifyDemandedBits.
Differential Revision: https://reviews.llvm.org/D56406
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350684 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 2851dbb..ca0db5c 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -350,9 +350,6 @@
SDLoc DL(Op);
unsigned Opcode = Op.getOpcode();
- if (!Op.hasOneUse())
- return false;
-
// Do target-specific constant optimization.
if (targetShrinkDemandedConstant(Op, Demanded, TLO))
return TLO.New.getNode();
diff --git a/lib/Target/AMDGPU/SIISelLowering.cpp b/lib/Target/AMDGPU/SIISelLowering.cpp
index 894806b..0e2e3b0 100644
--- a/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -8586,8 +8586,7 @@
TargetLowering::TargetLoweringOpt TLO(DAG, !DCI.isBeforeLegalize(),
!DCI.isBeforeLegalizeOps());
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
- if (TLI.ShrinkDemandedConstant(Src, Demanded, TLO) ||
- TLI.SimplifyDemandedBits(Src, Demanded, Known, TLO)) {
+ if (TLI.SimplifyDemandedBits(Src, Demanded, Known, TLO)) {
DCI.CommitTargetLoweringOpt(TLO);
}
