From ffd628ec0a64e5f4c8bdfa49f87abc61a91b6035 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Mon, 28 Jun 2010 19:39:57 +0000
Subject: [PATCH] After physreg coalescing, physical registers might not have
 live ranges where you would expect.

Don't assert on that case, just give up.

This fixes PR7513.

llvm-svn: 107046
---
 llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
index b068f316b664..5f4ef5b3b1ca 100644
--- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -122,7 +122,8 @@ bool SimpleRegisterCoalescing::AdjustCopiesBackFrom(const CoalescerPair &CP,
   // AValNo is the value number in A that defines the copy, A3 in the example.
   SlotIndex CopyUseIdx = CopyIdx.getUseIndex();
   LiveInterval::iterator ALR = IntA.FindLiveRangeContaining(CopyUseIdx);
-  assert(ALR != IntA.end() && "Live range not found!");
+  // The live range might not exist after fun with physreg coalescing.
+  if (ALR == IntA.end()) return false;
   VNInfo *AValNo = ALR->valno;
   // If it's re-defined by an early clobber somewhere in the live range, then
   // it's not safe to eliminate the copy. FIXME: This is a temporary workaround.