Reapply r143206, with fixes. Disallow physical register lifetimes

across calls, and only check for nested dependences on the special
call-sequence-resource register.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143660 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/Target/XCore/XCoreISelLowering.cpp b/lib/Target/XCore/XCoreISelLowering.cpp
index 2afe0e35af..4b74f96047 100644
--- a/lib/Target/XCore/XCoreISelLowering.cpp
+++ b/lib/Target/XCore/XCoreISelLowering.cpp
@@ -386,6 +386,15 @@ IsWordAlignedBasePlusConstantOffset(SDValue Addr, SDValue &AlignedBase,
     Offset = off;
     return true;
   }
+  // Check for an aligned global variable.
+  if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(*Root)) {
+    const GlobalValue *GV = GA->getGlobal();
+    if (GA->getOffset() == 0 && GV->getAlignment() >= 4) {
+      AlignedBase = Base;
+      Offset = off;
+      return true;
+    }
+  }
   return false;
 }