GitHub-Proxy/eigen
1
0
Fork 0
mirror of https://gitlab.com/libeigen/eigen.git synced 2025-06-04 18:54:00 +08:00
Code Issues Packages Projects Releases Wiki Activity

Avoid using the version of TensorIntDiv optimized for 32-bit integers when the divisor can be equal to one since it isn't supported.

Browse Source
This commit is contained in:
Benoit Steiner 2015-11-18 11:37:58 -08:00
parent 4926251f13
commit 1dd444ea71
2 changed files with 29 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h
View File

@ -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);
}

27
unsupported/test/cxx11_tensor_intdiv.cpp
View File

@ -14,8 +14,29 @@
void test_signed_32bit()
{
// Divide by one
const Eigen::internal::TensorIntDivisor<int32_t, false> div(1);
for (int32_t j = 0; j < 25000; ++j) {
const int32_t fast_div = j / div;
const int32_t slow_div = j / 1;
VERIFY_IS_EQUAL(fast_div, slow_div);
}
// Standard divide by 2 or more
for (int32_t i = 2; i < 25000; ++i) {
const Eigen::internal::TensorIntDivisor<int32_t> div(i);
const Eigen::internal::TensorIntDivisor<int32_t, false> div(i);
for (int32_t j = 0; j < 25000; ++j) {
const int32_t fast_div = j / div;
const int32_t slow_div = j / i;
VERIFY_IS_EQUAL(fast_div, slow_div);
}
}
// Optimized divide by 2 or more
for (int32_t i = 2; i < 25000; ++i) {
const Eigen::internal::TensorIntDivisor<int32_t, true> div(i);
for (int32_t j = 0; j < 25000; ++j) {
const int32_t fast_div = j / div;
@ -42,7 +63,7 @@ void test_unsigned_32bit()
void test_signed_64bit()
{
for (int64_t i = 2; i < 25000; ++i) {
for (int64_t i = 1; i < 25000; ++i) {
const Eigen::internal::TensorIntDivisor<int64_t> div(i);
for (int64_t j = 0; j < 25000; ++j) {
@ -56,7 +77,7 @@ void test_signed_64bit()
void test_unsigned_64bit()
{
for (uint64_t i = 2; i < 25000; ++i) {
for (uint64_t i = 1; i < 25000; ++i) {
const Eigen::internal::TensorIntDivisor<uint64_t> div(i);
for (uint64_t j = 0; j < 25000; ++j) {