Don't fast-isel for atomic load/store; some cases require extra handling missing from fast-isel.

llvm-svn: 139044

2 files changed, 16 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMFastISel.cpp b/llvm/lib/Target/ARM/ARMFastISel.cpp
index 390cd92cd6f..79c13913e9a 100644
--- a/llvm/lib/Target/ARM/ARMFastISel.cpp
+++ b/llvm/lib/Target/ARM/ARMFastISel.cpp
@@ -946,6 +946,10 @@ bool ARMFastISel::ARMEmitLoad(EVT VT, unsigned &ResultReg, Address &Addr) {
 }
 
 bool ARMFastISel::SelectLoad(const Instruction *I) {
+  // Atomic loads need special handling.
+  if (cast<LoadInst>(I)->isAtomic())
+    return false;
+
   // Verify we have a legal type before going any further.
   MVT VT;
   if (!isLoadTypeLegal(I->getType(), VT))
@@ -1008,6 +1012,10 @@ bool ARMFastISel::SelectStore(const Instruction *I) {
   Value *Op0 = I->getOperand(0);
   unsigned SrcReg = 0;
 
+  // Atomic stores need special handling.
+  if (cast<StoreInst>(I)->isAtomic())
+    return false;
+
   // Verify we have a legal type before going any further.
   MVT VT;
   if (!isLoadTypeLegal(I->getOperand(0)->getType(), VT))
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index f5db6d28a24..452b215071f 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -658,6 +658,10 @@ bool X86FastISel::X86SelectCallAddress(const Value *V, X86AddressMode &AM) {
 
 /// X86SelectStore - Select and emit code to implement store instructions.
 bool X86FastISel::X86SelectStore(const Instruction *I) {
+  // Atomic stores need special handling.
+  if (cast<StoreInst>(I)->isAtomic())
+    return false;
+
   MVT VT;
   if (!isTypeLegal(I->getOperand(0)->getType(), VT, /*AllowI1=*/true))
     return false;
@@ -780,6 +784,10 @@ bool X86FastISel::X86SelectRet(const Instruction *I) {
 /// X86SelectLoad - Select and emit code to implement load instructions.
 ///
 bool X86FastISel::X86SelectLoad(const Instruction *I)  {
+  // Atomic loads need special handling.
+  if (cast<LoadInst>(I)->isAtomic())
+    return false;
+
   MVT VT;
   if (!isTypeLegal(I->getType(), VT, /*AllowI1=*/true))
     return false;