[SystemZ] Add hasSideEffects flag on Serialize instruction.

Serialize will perform a hardware serialization operation, and is
acting as a memory barrier. Therefore it must have the hasSideEffects
flag set so it will be treated as a global memory object.

Reviewed by Ulrich Weigand

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257036 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/SystemZ/SystemZInstrInfo.td b/lib/Target/SystemZ/SystemZInstrInfo.td
index b9f2eb5514a5c541df42aacb8e810e9797617187..d5dabc2cd6ab03728ad071ec6205282ecf1c6ab4 100644 (file)
--- a/lib/Target/SystemZ/SystemZInstrInfo.td
+++ b/lib/Target/SystemZ/SystemZInstrInfo.td
@@ -1219,6 +1219,9 @@ def PFDRL : PrefetchRILPC<"pfdrl", 0xC62, z_prefetch>;
 // Atomic operations
 //===----------------------------------------------------------------------===//
 
+// A serialization instruction that acts as a barrier for all memory
+// accesses, which expands to "bcr 14, 0".
+let hasSideEffects = 1 in
 def Serialize : Alias<2, (outs), (ins), [(z_serialize)]>;
 
 let Predicates = [FeatureInterlockedAccess1], Defs = [CC] in {