GPU TPC: Compute alternate dEdx only if alternate flag mask different compared to normal flag mask

[davidrohr]

No description provided.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
async-2022-pp-apass7
async-2024-pp-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1
async-2024-PbPb-apass2
async-2023-PbPb-apass5

[alibuild]

Error while checking build/O2/fullCI_slc9 for d834323 at 2025-05-12 15:00:

## sw/BUILD/O2-RTC-test-latest/log
/tmp/o2cagpu_rtc_131_740876268_9.hip:17265:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_9.hip:17270:37: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_9.hip:17383:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_9.hip:17407:39: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_9.hip:17440:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_77.hip:17265:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_77.hip:17270:37: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_77.hip:17383:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_77.hip:17407:39: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_77.hip:17440:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_77.hip:26447:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_77.hip:26450:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_49.hip:17265:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_49.hip:17270:37: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_49.hip:17383:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_49.hip:17407:39: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_49.hip:17440:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_9.hip:26447:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_9.hip:26450:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_55.hip:17265:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_55.hip:17270:37: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_55.hip:17383:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_55.hip:17407:39: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_55.hip:17440:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_1.hip:17265:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_1.hip:17270:37: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_1.hip:17383:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_1.hip:17407:39: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_1.hip:17440:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_57.hip:17265:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_57.hip:17270:37: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_57.hip:17383:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_57.hip:17407:39: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_57.hip:17440:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_55.hip:26447:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_55.hip:26450:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_49.hip:26447:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_49.hip:26450:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_87.hip:17265:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_71.hip:17265:33: error: constexpr if condition is not a constant expression
       |                                ^/tmp/o2cagpu_rtc_131_740876268_71.hip:17270:37: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_87.hip:17270:37: error: constexpr if condition is not a constant expression
 17270 |             if/tmp/o2cagpu_rtc_131_740876268_71.hip:17383:33: error: constexpr if condition is not a constant expression
 GPUCA_RTC_/tmp/o2cagpu_rtc_131_740876268_71.hip:17407:39: error: constexpr if condition is not a constant expression
CONSTEXPR /tmp/o2cagpu_rtc_131_740876268_71.hip:17440:29: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_87.hip:17383:33: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_87.hip:17407:39: error: constexpr if condition is not a constant expression
/tmp/o2cagpu_rtc_131_740876268_87.hip:17440:29: error: constexpr if condition is not a constant expression
[0 more errors; see full log]

Full log here.

[alibuild]

Error while checking build/O2/fullCI_slc9 for 1f80afa at 2025-05-12 22:47:

No log files found

Full log here.

[shahor02]

@davidrohr, if I understood correctly, the TrackTPC.mdEdxAlt will not be filled at all if dEdxClusterRejectionFlagMask == dEdxClusterRejectionFlagMaskAlt? Then the TrackQC will not be filled correctly at

AliceO2/Detectors/AOD/src/AODProducerWorkflowSpec.cxx

Line 2562 in 240812f

const auto& dEdx = tpcOrig.getdEdx().dEdxTotTPC > 0 ? tpcOrig.getdEdx() : tpcOrig.getdEdxAlt();

.
One should either assign the TrackTPC.mdEdxAlt from the regular dedx or at least use the latter in the AODProducer to fill the table.

[davidrohr]

@davidrohr, if I understood correctly, the TrackTPC.mdEdxAlt will not be filled at all if dEdxClusterRejectionFlagMask == dEdxClusterRejectionFlagMaskAlt? Then the TrackQC will not be filled correctly at

AliceO2/Detectors/AOD/src/AODProducerWorkflowSpec.cxx

Line 2562 in 240812f

const auto& dEdx = tpcOrig.getdEdx().dEdxTotTPC > 0 ? tpcOrig.getdEdx() : tpcOrig.getdEdxAlt();

.
One should either assign the TrackTPC.mdEdxAlt from the regular dedx or at least use the latter in the AODProducer to fill the table.

I changed it such that it fills the TrackTPC.mdEdxAlt with the same data as TrackTPC.mdEdx.

[davidrohr]

I did not manage to find a better workaround for GPU: Workaround for Clang Frontend issue

My current attempt is here, but doesn't work: https://godbolt.org/z/MnEd5G38Y

Will retrry in the future, or we have to wait for ROCm to bump to Clang20 and switch to -std=c++23.

Merging as is.