From: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Date: Thu, 15 Nov 2012 19:33:30 +0000 (+0000)
Subject: Use std::stable_sort instead of std::sort when sorting stack slots
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=f38aa4272c2fcebae4ad10b21ea29874d0edef80;p=oota-llvm.git

Use std::stable_sort instead of std::sort when sorting stack slots
to guarantee deterministic code generation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168074 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/StackColoring.cpp b/lib/CodeGen/StackColoring.cpp
index 1cbee843a12..e306a2f2c20 100644
--- a/lib/CodeGen/StackColoring.cpp
+++ b/lib/CodeGen/StackColoring.cpp
@@ -720,7 +720,9 @@ bool StackColoring::runOnMachineFunction(MachineFunction &Func) {
   // and continue.
 
   // Sort the slots according to their size. Place unused slots at the end.
-  std::sort(SortedSlots.begin(), SortedSlots.end(), SlotSizeSorter(MFI));
+  // Use stable sort to guarantee deterministic code generation.
+  std::stable_sort(SortedSlots.begin(), SortedSlots.end(),
+                   SlotSizeSorter(MFI));
 
   bool Chanded = true;
   while (Chanded) {