Report AD checkpoint contexts (#5058)

* Transferring source locations when creating phi instructions

* Tracking for simple variables

* Deriving source locations for loop counters

* Printing checkpoint structure breakdown

* More readable output format

* Special behavior for loop counters

* Writing report to file

* Add slangc option to enable checkpoint reports

* Display types of checkpointed fields

* Message in case there are no checkpointing contexts

* Catch source locations for function calls

* Source cleanup

* Fix compilation warnings

* Remove stray dump()

* Provide the report through diagnostic notes

* Add missing path for sourceLoc during unzip pass

* Add tests for reporting intermediates

* Include more transfer cases for source locations

* Fix ordering in address elimination

* Fill in more holes with source location transfer

* Remove debugging line

* Reverting changes to diagnostic sink

* Simplify address elimination using source location RAII contexts

* Eliminating manual source loc transfers in forward transcription

* Fix local var adaptation to use RAII location setter

* Simplify primal hoisting logic for source location transfer

* Simplify unzipping with RAII location scopes

* Simplify transpose logic

* Cleaning up for rev.cpp

* Reverting spacing changes

* Fix mistake with source loc RAII instantiation

* Fix formatting issues

1 files changed, 2 insertions, 0 deletions

diff --git a/source/slang/slang-ir.cpp b/source/slang/slang-ir.cpp
index 9305d1783..6c7691d13 100644
--- a/source/slang/slang-ir.cpp
+++ b/source/slang/slang-ir.cpp
@@ -3512,6 +3512,7 @@ namespace Slang
         auto inst = createInstWithTrailingArgs<IRMakeDifferentialPair>(
             this, kIROp_MakeDifferentialPair, type, 2, args);
         addInst(inst);
+        inst->sourceLoc = primal->sourceLoc;
         return inst;
     }
 
@@ -3524,6 +3525,7 @@ namespace Slang
         auto inst = createInstWithTrailingArgs<IRMakeDifferentialPair>(
             this, kIROp_MakeDifferentialPairUserCode, type, 2, args);
         addInst(inst);
+        inst->sourceLoc = primal->sourceLoc;
         return inst;
     }