From 5d3257e37ced7dd75023bb9c4619f297374f61d6 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Fri, 28 Jun 2013 21:51:18 +0000 Subject: Fix a bad overflow check pointed out by Ben. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185226 91177308-0d34-0410-b5e6-96231b3b80d8 --- unittests/Support/BlockFrequencyTest.cpp | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'unittests') diff --git a/unittests/Support/BlockFrequencyTest.cpp b/unittests/Support/BlockFrequencyTest.cpp index 4bcddfebd9..ca420fccaa 100644 --- a/unittests/Support/BlockFrequencyTest.cpp +++ b/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) { -- cgit v1.2.3