AArch64: make FastISel memcpy emission more robust.

We were hitting an assert if FastISel couldn't create the load or store we
requested. Currently this happens for large frame-local addresses, though
CodeGen could be improved there.

rdar://problem/17187463

llvm-svn: 210519

1 files changed, 5 insertions, 3 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64FastISel.cpp b/llvm/lib/Target/AArch64/AArch64FastISel.cpp
index c84889e1f9d..f3beef4ecb6 100644
--- a/llvm/lib/Target/AArch64/AArch64FastISel.cpp
+++ b/llvm/lib/Target/AArch64/AArch64FastISel.cpp
@@ -1460,10 +1460,12 @@ bool AArch64FastISel::TryEmitSmallMemCpy(Address Dest, Address Src,
     bool RV;
     unsigned ResultReg;
     RV = EmitLoad(VT, ResultReg, Src);
-    assert(RV == true && "Should be able to handle this load.");
+    if (!RV)
+      return false;
+
     RV = EmitStore(VT, ResultReg, Dest);
-    assert(RV == true && "Should be able to handle this store.");
-    (void)RV;
+    if (!RV)
+      return false;
 
     int64_t Size = VT.getSizeInBits() / 8;
     Len -= Size;