From 0bb2ad2cf7f8032492401d82e0cb6be6b98406a0 Mon Sep 17 00:00:00 2001
From: Frits van Bommel <fvbommel@gmail.com>
Date: Sun, 27 Mar 2011 14:26:13 +0000
Subject: Constant folding support for calls to umul.with.overflow(), basically
 identical to the smul.with.overflow() code.

llvm-svn: 128379
---
 llvm/lib/Support/APInt.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'llvm/lib/Support/APInt.cpp')

diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
index f4aae72..5789721 100644
--- a/llvm/lib/Support/APInt.cpp
+++ b/llvm/lib/Support/APInt.cpp
@@ -2078,6 +2078,16 @@ APInt APInt::smul_ov(const APInt &RHS, bool &Overflow) const {
   return Res;
 }
 
+APInt APInt::umul_ov(const APInt &RHS, bool &Overflow) const {
+  APInt Res = *this * RHS;
+
+  if (*this != 0 && RHS != 0)
+    Overflow = Res.udiv(RHS) != *this || Res.udiv(*this) != RHS;
+  else
+    Overflow = false;
+  return Res;
+}
+
 APInt APInt::sshl_ov(unsigned ShAmt, bool &Overflow) const {
   Overflow = ShAmt >= getBitWidth();
   if (Overflow)
-- 
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