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ECAL - Make EcalConstants constexpr arrays compatible with CUDA code #37161

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Mar 13, 2022
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ECAL - Make EcalConstants constexpr arrays compatible with CUDA code #37161

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38 changes: 26 additions & 12 deletions DataFormats/EcalDigi/interface/EcalConstants.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2,11 +2,26 @@
#ifndef DataFormats_EcalDigi_EcalConstants_h
#define DataFormats_EcalDigi_EcalConstants_h

#include "FWCore/Utilities/interface/HostDeviceConstant.h"

// The HOST_DEVICE_CONSTANTs can not reside in the classes directly, which is
// why they are defined in a namespace and constant pointers to them are used in the classes
namespace ecalph2 {
constexpr unsigned int NGAINS = 2; // Number of CATIA gains
HOST_DEVICE_CONSTANT float gains[NGAINS] = {10., 1.}; // CATIA gain values
} // namespace ecalph2

namespace ecalph1 {
constexpr unsigned int NGAINS = 4; // Number of MGPA gains including a zero gain that
// could be encoded in the gain id mask
HOST_DEVICE_CONSTANT float gains[NGAINS] = {0., 12., 6., 1.}; // MGPA gain values including a zero gain
} // namespace ecalph1

class ecalPh2 {
public:
static constexpr double Samp_Period = 6.25; // ADC sampling period in ns
static constexpr unsigned int NGAINS = 2; // Number of CATIA gains
static constexpr float gains[NGAINS] = {10., 1.}; // CATIA gain values
static constexpr unsigned int NGAINS = ecalph2::NGAINS; // Number of CATIA gains
static constexpr const float *gains = ecalph2::gains; // CATIA gain values
static constexpr unsigned int gainId1 = 1; // Position of gain 1 in gains array
static constexpr unsigned int gainId10 = 0; // Position of gain 10 in gains array
static constexpr unsigned int sampleSize = 16; // Number of samples per event
Expand All @@ -23,15 +38,14 @@ class ecalPh2 {

class ecalPh1 {
public:
static constexpr double Samp_Period = 25.; // ADC sampling period in ns
static constexpr unsigned int NGAINS = 4; // Number of MGPA gains including a zero gain that
// could be encoded in the gain id mask
static constexpr float gains[NGAINS] = {0., 12., 6., 1.}; // MGPA gain values including a zero gain
static constexpr unsigned int sampleSize = 10; // Number of samples per event
static constexpr unsigned int NBITS = 12; // Number of available bits
static constexpr unsigned int kNOffsets = 2000; // Number of time offsets generated for APD pulse shape
// simulation and reused for every kNOffsets^th channel
static constexpr unsigned int kAdcMask = 0xFFF; // ADC sample mask for unpacking
static constexpr unsigned int kGainIdMask = 0x3; // Gain id mask for unpacking
static constexpr double Samp_Period = 25.; // ADC sampling period in ns
static constexpr unsigned int NGAINS = ecalph1::NGAINS; // Number of MGPA gains including a zero gain
static constexpr const float *gains = ecalph1::gains; // MGPA gain values including a zero gain
static constexpr unsigned int sampleSize = 10; // Number of samples per event
static constexpr unsigned int NBITS = 12; // Number of available bits
static constexpr unsigned int kNOffsets = 2000; // Number of time offsets generated for APD pulse shape
// simulation and reused for every kNOffsets^th channel
static constexpr unsigned int kAdcMask = 0xFFF; // ADC sample mask for unpacking
static constexpr unsigned int kGainIdMask = 0x3; // Gain id mask for unpacking
};
#endif