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Add a generic packet ops corresponding to {std}::fmin and {std}::fmax. The non-sensical NaN-propagation rules for std::min std::max implemented by pmin and pmax in Eigen is a longstanding source og confusion and bug report. This change is a first step towards addressing it, as discussing in issue #564.

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This commit is contained in:
Rasmus Munk Larsen
2020-10-01 16:54:31 +00:00
parent 44b9d4e412
commit 3b445d9bf2
2 changed files with 41 additions and 2 deletions
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20
test/packetmath.cpp
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@@ -783,6 +783,15 @@ void packetmath_notcomplex() {
CHECK_CWISE2_IF(PacketTraits::HasMin, (std::min), internal::pmin);
CHECK_CWISE2_IF(PacketTraits::HasMax, (std::max), internal::pmax);
#if EIGEN_HAS_CXX11_MATH
using std::fmin;
using std::fmax;
#else
using ::fmin;
using ::fmax;
#endif
CHECK_CWISE2_IF(PacketTraits::HasMin, fmin, internal::pfmin);
CHECK_CWISE2_IF(PacketTraits::HasMax, fmax, internal::pfmax);
CHECK_CWISE1(numext::abs, internal::pabs);
CHECK_CWISE2_IF(PacketTraits::HasAbsDiff, REF_ABS_DIFF, internal::pabsdiff);
@@ -815,6 +824,17 @@ void packetmath_notcomplex() {
for (unsigned int i = 0; i < sizeof(Scalar); ++i) data1_bits[k * sizeof(Scalar) + i] = 0x00;
}
}
for (int i = 0; i < PacketSize; ++i) {
data1[i] = internal::random<bool>() ? std::numeric_limits<Scalar>::quiet_NaN() : Scalar(0);
data1[i + PacketSize] = internal::random<bool>() ? std::numeric_limits<Scalar>::quiet_NaN() : Scalar(0);
}
// Test NaN propagation for pmin and pmax. It should be equivalent to std::min.
CHECK_CWISE2_IF(PacketTraits::HasMin, (std::min), internal::pmin);
CHECK_CWISE2_IF(PacketTraits::HasMax, (std::max), internal::pmax);
// Test NaN propagation for pfmin and pfmax. It should be equivalent to std::fmin.
CHECK_CWISE2_IF(PacketTraits::HasMin, fmin, internal::pfmin);
CHECK_CWISE2_IF(PacketTraits::HasMax, fmax, internal::pfmax);
}
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