Replace FIXME with explanatory comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148427 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 8cc0cdbb25116c6fec387aab4f2e3f5868504f67..da58146ec274317e5d5fc54f04632f1c6f754ac7 100644 (file)
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -940,7 +940,8 @@ multiclass T2I_ld<bit signed, bits<2> opcod, string opc,
     let DecoderMethod = "DecodeT2LoadShift";
   }
 
-  // FIXME: Is the pci variant actually needed?
+  // pci variant is very similar to i12, but supports negative offsets
+  // from the PC.
   def pci : T2Ipc <(outs target:$Rt), (ins t2ldrlabel:$addr), iii,
                    opc, ".w\t$Rt, $addr",
                    [(set target:$Rt, (opnode (ARMWrapper tconstpool:$addr)))]> {