From 3192b2fceabc4d0d9fb91fcef59cde41749b66a0 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Fri, 28 Jun 2013 21:51:18 +0000
Subject: Fix a bad overflow check pointed out by Ben.

llvm-svn: 185226
---
 llvm/unittests/Support/BlockFrequencyTest.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'llvm/unittests/Support/BlockFrequencyTest.cpp')

diff --git a/llvm/unittests/Support/BlockFrequencyTest.cpp b/llvm/unittests/Support/BlockFrequencyTest.cpp
index 4bcddfebd9a..ca420fccaa5 100644
--- a/llvm/unittests/Support/BlockFrequencyTest.cpp
+++ b/llvm/unittests/Support/BlockFrequencyTest.cpp
@@ -68,6 +68,11 @@ TEST(BlockFrequencyTest, Saturate) {
   Freq = 0x1000000000000000ULL;
   Freq /= BranchProbability(10000, 160000);
   EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
+
+  // Try to cheat the multiplication overflow check.
+  Freq = 0x00000001f0000001ull;
+  Freq /= BranchProbability(1000, 0xf000000f);
+  EXPECT_EQ(33506781356485509ULL, Freq.getFrequency());
 }
 
 TEST(BlockFrequencyTest, ProbabilityCompare) {
-- 
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