GlobalISel: Add G_FENCE

The pattern importer is for some reason emitting checks for G_CONSTANT
for the immediate operands.

llvm-svn: 364926

2 files changed, 15 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 443ca730d55..96efcf7a373 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -2029,6 +2029,14 @@ bool IRTranslator::translateAtomicRMW(const User &U,
   return true;
 }
 
+bool IRTranslator::translateFence(const User &U,
+                                  MachineIRBuilder &MIRBuilder) {
+  const FenceInst &Fence = cast<FenceInst>(U);
+  MIRBuilder.buildFence(static_cast<unsigned>(Fence.getOrdering()),
+                        Fence.getSyncScopeID());
+  return true;
+}
+
 void IRTranslator::finishPendingPhis() {
 #ifndef NDEBUG
   DILocationVerifier Verifier;
diff --git a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
index 00dce14fe07..4d6026ade86 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
@@ -851,6 +851,13 @@ MachineIRBuilder::buildAtomicRMWUmin(Register OldValRes, Register Addr,
 }
 
 MachineInstrBuilder
+MachineIRBuilder::buildFence(unsigned Ordering, unsigned Scope) {
+  return buildInstr(TargetOpcode::G_FENCE)
+    .addImm(Ordering)
+    .addImm(Scope);
+}
+
+MachineInstrBuilder
 MachineIRBuilder::buildBlockAddress(Register Res, const BlockAddress *BA) {
 #ifndef NDEBUG
   assert(getMRI()->getType(Res).isPointer() && "invalid res type");