From 1dd444ea71d30cc3a1eab7af0ba3f6a0357ae93c Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Wed, 18 Nov 2015 11:37:58 -0800
Subject: Avoid using the version of TensorIntDiv optimized for 32-bit integers
 when the divisor can be equal to one since it isn't supported.

---
 unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h')

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h b/unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h
index fd2441894..058fb2c42 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h
@@ -116,7 +116,7 @@ namespace {
 }
 
 
-template <typename T>
+template <typename T, bool div_gt_one = false>
 struct TensorIntDivisor {
  public:
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TensorIntDivisor() {
@@ -166,8 +166,9 @@ struct TensorIntDivisor {
 
 // Optimized version for signed 32 bit integers.
 // Derived from Hacker's Delight.
+// Only works for divisors strictly greater than one
 template <>
-class TensorIntDivisor<int32_t> {
+class TensorIntDivisor<int32_t, true> {
  public:
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TensorIntDivisor() {
     magic = 0;
@@ -226,8 +227,8 @@ private:
 };
 
 
-template <typename T>
-static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE T operator / (const T& numerator, const TensorIntDivisor<T>& divisor) {
+template <typename T, bool div_gt_one>
+static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE T operator / (const T& numerator, const TensorIntDivisor<T, div_gt_one>& divisor) {
   return divisor.divide(numerator);
 }
 
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