From 14b2112e2423ecd346895203b72b23888dd469de Mon Sep 17 00:00:00 2001 From: Alexey Samsonov Date: Sat, 6 Sep 2014 00:41:19 +0000 Subject: [PATCH] Fix right shift by 64 bits detected on CXX/lex/lex.literal/lex.ext/p4.cpp test case on UBSan bootstrap bot. This fixes the last failure of "check-clang" in UBSan bootstrap bot. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217294 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Support/APFloat.cpp | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp index 7989e30afae..097986d3e7c 100644 --- a/lib/Support/APFloat.cpp +++ b/lib/Support/APFloat.cpp @@ -3377,7 +3377,9 @@ void APFloat::makeLargest(bool Negative) { // internal consistency. const unsigned NumUnusedHighBits = PartCount*integerPartWidth - semantics->precision; - significand[PartCount - 1] = ~integerPart(0) >> NumUnusedHighBits; + significand[PartCount - 1] = (NumUnusedHighBits < integerPartWidth) + ? (~integerPart(0) >> NumUnusedHighBits) + : 0; } /// Make this number the smallest magnitude denormal number in the given -- 2.34.1