From 8aba95d64cf315d45b5d2faf2c809b7bd7f4e8e7 Mon Sep 17 00:00:00 2001 From: Alex Bradbury Date: Thu, 18 Jul 2019 04:02:58 +0000 Subject: [RISCV] Avoid signed integer overflow UB in RISCVMatInt::generateInstSeq Found by UBSan. llvm-svn: 366398 --- llvm/lib/Target/RISCV/Utils/RISCVMatInt.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'llvm/lib/Target/RISCV/Utils/RISCVMatInt.cpp') diff --git a/llvm/lib/Target/RISCV/Utils/RISCVMatInt.cpp b/llvm/lib/Target/RISCV/Utils/RISCVMatInt.cpp index 2504df5ef9b..f390ddb89e3 100644 --- a/llvm/lib/Target/RISCV/Utils/RISCVMatInt.cpp +++ b/llvm/lib/Target/RISCV/Utils/RISCVMatInt.cpp @@ -64,7 +64,7 @@ void generateInstSeq(int64_t Val, bool IsRV64, InstSeq &Res) { // performed when the recursion returns. int64_t Lo12 = SignExtend64<12>(Val); - int64_t Hi52 = (Val + 0x800) >> 12; + int64_t Hi52 = ((uint64_t)Val + 0x800ull) >> 12; int ShiftAmount = 12 + findFirstSet((uint64_t)Hi52); Hi52 = SignExtend64(Hi52 >> (ShiftAmount - 12), 64 - ShiftAmount); -- cgit v1.2.3