From 1bfc89baacea6f67beb0c13a8795f752577e1cc2 Mon Sep 17 00:00:00 2001
From: Stephen Canon <scanon@apple.com>
Date: Mon, 16 Nov 2015 21:52:48 +0000
Subject: Add isInteger() to APFloat.

Useful utility function; this wasn't too hard to do before, but also wasn't
obviously discoverable.  Make it explicit.  Reviewed offline by Michael
Gottesman.

llvm-svn: 253254
---
 llvm/lib/Support/APFloat.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

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

diff --git a/llvm/lib/Support/APFloat.cpp b/llvm/lib/Support/APFloat.cpp
index 91b3db59d0e..19b8221b60c 100644
--- a/llvm/lib/Support/APFloat.cpp
+++ b/llvm/lib/Support/APFloat.cpp
@@ -767,6 +767,15 @@ APFloat::isLargest() const {
     && isSignificandAllOnes();
 }
 
+bool
+APFloat::isInteger() const {
+  // This could be made more efficient; I'm going for obviously correct.
+  if (!isFinite()) return false;
+  APFloat truncated = *this;
+  truncated.roundToIntegral(rmTowardZero);
+  return compare(truncated) == cmpEqual;
+}
+
 bool
 APFloat::bitwiseIsEqual(const APFloat &rhs) const {
   if (this == &rhs)
-- 
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