From 423d6744123e4886f9f79f6273fa345b9cce51a8 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 2 Apr 2013 18:26:45 +0000
Subject: [PATCH] Don't attempt MTM heuristics without a scheduling model
 present.

This should fix the PPC buildbots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178558 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/EarlyIfConversion.cpp     | 4 ++++
 test/CodeGen/X86/early-ifcvt-crash.ll | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/lib/CodeGen/EarlyIfConversion.cpp b/lib/CodeGen/EarlyIfConversion.cpp
index 5447df09cbb..fc767362be7 100644
--- a/lib/CodeGen/EarlyIfConversion.cpp
+++ b/lib/CodeGen/EarlyIfConversion.cpp
@@ -677,6 +677,10 @@ bool EarlyIfConverter::shouldConvertIf() {
   if (Stress)
     return true;
 
+  // Without a scheduling model, we can't make decisions.
+  if (!SchedModel->hasInstrSchedModel())
+    return false;
+
   if (!MinInstr)
     MinInstr = Traces->getEnsemble(MachineTraceMetrics::TS_MinInstrCount);
 
diff --git a/test/CodeGen/X86/early-ifcvt-crash.ll b/test/CodeGen/X86/early-ifcvt-crash.ll
index c8280269689..d9580503e91 100644
--- a/test/CodeGen/X86/early-ifcvt-crash.ll
+++ b/test/CodeGen/X86/early-ifcvt-crash.ll
@@ -1,5 +1,7 @@
 ; RUN: llc < %s -x86-early-ifcvt -verify-machineinstrs
 ; RUN: llc < %s -x86-early-ifcvt -stress-early-ifcvt -verify-machineinstrs
+; CPU without a scheduling model:
+; RUN: llc < %s -x86-early-ifcvt -mcpu=pentium3 -verify-machineinstrs
 ;
 ; Run these tests with and without -stress-early-ifcvt to exercise heuristics.
 ;