[DAGCombine] Fix for PR35765

Remove the acceptance of ANY_EXTEND nodes while trying to move and
nodes back to loads.

Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=35765

Differential Revision: https://reviews.llvm.org/D41625

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321641 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 3218dce8f575270328b5616e22aa01e59d709659..5843f86a842119f14483ccd6b431f3ab745341ba 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3850,7 +3850,6 @@ bool DAGCombiner::SearchForAndLoads(SDNode *N,
       return false;
     }
     case ISD::ZERO_EXTEND:
-    case ISD::ANY_EXTEND:
     case ISD::AssertZext: {
       unsigned ActiveBits = Mask->getAPIntValue().countTrailingOnes();
       EVT ExtVT = EVT::getIntegerVT(*DAG.getContext(), ActiveBits);

diff --git a/test/CodeGen/X86/pr35765.ll b/test/CodeGen/X86/pr35765.ll
index 1b78a4cd392603d9635cf56a329b35ec09097697..4d097459e33acc365b5039c974d6dbd2892438d8 100644 (file)
--- a/test/CodeGen/X86/pr35765.ll
+++ b/test/CodeGen/X86/pr35765.ll
@@ -17,8 +17,9 @@ define void @PR35765() {
 ; CHECK-NEXT:    movzwl {{.*}}(%rip), %ecx
 ; CHECK-NEXT:    movzwl {{.*}}(%rip), %edx
 ; CHECK-NEXT:    notl %edx
+; CHECK-NEXT:    orl $63488, %edx # imm = 0xF800
+; CHECK-NEXT:    movzwl %dx, %edx
 ; CHECK-NEXT:    orl %ecx, %edx
-; CHECK-NEXT:    orl $-2048, %edx # imm = 0xF800
 ; CHECK-NEXT:    xorl %eax, %edx
 ; CHECK-NEXT:    movslq %edx, %rax
 ; CHECK-NEXT:    movq %rax, {{.*}}(%rip)