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Age	Commit message (Collapse)	Author	Files	Lines
2025-07-14	[flang][runtime] Speed up initialization & destruction (#148087)	Peter Klausler	1	-26/+14
	Rework derived type initialization in the runtime to just initialize the first element of any array, and then memcpy it to the others, rather than exercising the per-component paths for each element. Reword derived type destruction in the runtime to detect and exploit a fast path for allocatable components whose types themselves don't need nested destruction. Small tweaks were made in hot paths exposed by profiling in descriptor operations and derived type assignment.
2025-06-16	[flang] Restructure runtime to avoid recursion (relanding) (#143993)	Peter Klausler	1	-0/+161
	Recursion, both direct and indirect, prevents accurate stack size calculation at link time for GPU device code. Restructure these recursive (often mutually so) routines in the Fortran runtime with new implementations based on an iterative work queue with suspendable/resumable work tickets: Assign, Initialize, initializeClone, Finalize, and Destroy. Default derived type I/O is also recursive, but already disabled. It can be added to this new framework later if the overall approach succeeds. Note that derived type FINAL subroutine calls, defined assignments, and defined I/O procedures all perform callbacks into user code, which may well reenter the runtime library. This kind of recursion is not handled by this change, although it may be possible to do so in the future using thread-local work queues. (Relanding this patch after reverting initial attempt due to some test failures that needed some time to analyze and fix.) Fixes https://github.com/llvm/llvm-project/issues/142481.
2025-06-11	Revert runtime work queue patch, it breaks some tests that need ↵	Peter Klausler	1	-161/+0
	investigation (#143713) Revert "[flang][runtime] Another try to fix build failure" This reverts commit 13869cac2b5051e453aa96ad71220d9d33404620. Revert "[flang][runtime] Fix build bot flang-runtime-cuda-gcc errors (#143650)" This reverts commit d75e28477af0baa063a4d4cc7b3cf657cfadd758. Revert "[flang][runtime] Replace recursion with iterative work queue (#137727)" This reverts commit 163c67ad3d1bf7af6590930d8f18700d65ad4564.
2025-06-10	[flang][runtime] Replace recursion with iterative work queue (#137727)	Peter Klausler	1	-0/+161
	Recursion, both direct and indirect, prevents accurate stack size calculation at link time for GPU device code. Restructure these recursive (often mutually so) routines in the Fortran runtime with new implementations based on an iterative work queue with suspendable/resumable work tickets: Assign, Initialize, initializeClone, Finalize, and Destroy. Default derived type I/O is also recursive, but already disabled. It can be added to this new framework later if the overall approach succeeds. Note that derived type FINAL subroutine calls, defined assignments, and defined I/O procedures all perform callbacks into user code, which may well reenter the runtime library. This kind of recursion is not handled by this change, although it may be possible to do so in the future using thread-local work queues. The effects of this restructuring on CPU performance are yet to be measured.