[PATCH] D63536: [MachinePipeliner] Fix risky iterator usage R++, --R

[Jinsong Ji via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL364353: [MachinePipeliner] Fix risky iterator usage R++, --R (authored by jsji, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D63536?vs=205502&id=206533#toc

Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D63536/new/

https://reviews.llvm.org/D63536

Files:
  llvm/trunk/lib/CodeGen/MachinePipeliner.cpp
  llvm/trunk/test/CodeGen/PowerPC/sms-iterator.ll


Index: llvm/trunk/test/CodeGen/PowerPC/sms-iterator.ll
===================================================================
--- llvm/trunk/test/CodeGen/PowerPC/sms-iterator.ll
+++ llvm/trunk/test/CodeGen/PowerPC/sms-iterator.ll
@@ -5,7 +5,7 @@
 
 %0 = type { i32, [16 x double] }
 
-; CHECK: MII = 7 MAX_II = 17
+; CHECK: MII = 8 MAX_II = 18
 
 define dso_local fastcc void @_ZN3povL9polysolveEiPdS0_() unnamed_addr #0 {
   br label %1
Index: llvm/trunk/lib/CodeGen/MachinePipeliner.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/MachinePipeliner.cpp
+++ llvm/trunk/lib/CodeGen/MachinePipeliner.cpp
@@ -1012,17 +1012,13 @@
     });
     for (unsigned C = 0; C < NumCycles; ++C)
       while (RI != RE) {
-        if ((*RI++)->canReserveResources(*MI)) {
+        if ((*RI)->canReserveResources(*MI)) {
+          (*RI)->reserveResources(*MI);
           ++ReservedCycles;
           break;
         }
+        RI++;
       }
-    // Start reserving resources using existing DFAs.
-    for (unsigned C = 0; C < ReservedCycles; ++C) {
-      --RI;
-      (*RI)->reserveResources(*MI);
-    }
-
     LLVM_DEBUG(dbgs() << "ReservedCycles:" << ReservedCycles
                       << ", NumCycles:" << NumCycles << "\n");
     // Add new DFAs, if needed, to reserve resources.


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