[SystemZ] Commenting (NFC)

Some minor commenting in scheduler files.

Review: Ulrich Weigand
llvm-svn: 332599

2 files changed, 10 insertions, 6 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZScheduleZ13.td b/llvm/lib/Target/SystemZ/SystemZScheduleZ13.td
index 051b1a36ff0..d460285824a 100644
--- a/llvm/lib/Target/SystemZ/SystemZScheduleZ13.td
+++ b/llvm/lib/Target/SystemZ/SystemZScheduleZ13.td
@@ -10,6 +10,8 @@
 // This file defines the machine model for Z13 to support instruction
 // scheduling and other instruction cost heuristics.
 //
+// Pseudos expanded right after isel do not need to be modelled here.
+//
 //===----------------------------------------------------------------------===//
 
 def Z13Model : SchedMachineModel {
@@ -28,9 +30,9 @@ def Z13Model : SchedMachineModel {
 
 let SchedModel = Z13Model in  {
 
-// These definitions could be put in a subtarget common include file,
-// but it seems the include system in Tablegen currently rejects
-// multiple includes of same file.
+// These definitions need the SchedModel value. They could be put in a
+// subtarget common include file, but it seems the include system in Tablegen
+// currently (2016) rejects multiple includes of same file.
 def : WriteRes<GroupAlone, []> {
   let NumMicroOps = 0;
   let BeginGroup  = 1;
diff --git a/llvm/lib/Target/SystemZ/SystemZScheduleZ14.td b/llvm/lib/Target/SystemZ/SystemZScheduleZ14.td
index 4a91c49ef54..fff8eae08f2 100644
--- a/llvm/lib/Target/SystemZ/SystemZScheduleZ14.td
+++ b/llvm/lib/Target/SystemZ/SystemZScheduleZ14.td
@@ -10,6 +10,8 @@
 // This file defines the machine model for Z14 to support instruction
 // scheduling and other instruction cost heuristics.
 //
+// Pseudos expanded right after isel do not need to be modelled here.
+//
 //===----------------------------------------------------------------------===//
 
 def Z14Model : SchedMachineModel {
@@ -28,9 +30,9 @@ def Z14Model : SchedMachineModel {
 
 let SchedModel = Z14Model in  {
 
-// These definitions could be put in a subtarget common include file,
-// but it seems the include system in Tablegen currently rejects
-// multiple includes of same file.
+// These definitions need the SchedModel value. They could be put in a
+// subtarget common include file, but it seems the include system in Tablegen
+// currently (2016) rejects multiple includes of same file.
 def : WriteRes<GroupAlone, []> {
   let NumMicroOps = 0;
   let BeginGroup  = 1;