[SystemZ] Improve handling of PC-relative addresses

The backend previously folded offsets into PC-relative addresses
whereever possible.  That's the right thing to do when the address
can be used directly in a PC-relative memory reference (using things
like LRL).  But if we have a register-based memory reference and need
to load the PC-relative address separately, it's better to use an anchor
point that could be shared with other accesses to the same area of the
variable.

Fixes a FIXME.

llvm-svn: 191524

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZOperands.td b/llvm/lib/Target/SystemZ/SystemZOperands.td
index f1db1fdb4c5..3ad146c57d9 100644
--- a/llvm/lib/Target/SystemZ/SystemZOperands.td
+++ b/llvm/lib/Target/SystemZ/SystemZOperands.td
@@ -46,7 +46,8 @@ class PCRelOperand<ValueType vt, AsmOperandClass asmop> : Operand<vt> {
 // address with address size VT.  SELF is the name of the operand and
 // ASMOP is the associated asm operand.
 class PCRelAddress<ValueType vt, string self, AsmOperandClass asmop>
-  : ComplexPattern<vt, 1, "selectPCRelAddress", [z_pcrel_wrapper]>,
+  : ComplexPattern<vt, 1, "selectPCRelAddress",
+                   [z_pcrel_wrapper, z_pcrel_offset]>,
     PCRelOperand<vt, asmop> {
   let MIOperandInfo = (ops !cast<Operand>(self));
 }