llvm/lib/Transforms
Peter Collingbourne 5f220beefc DI: Reverse direction of subprogram -> function edge.
Previously, subprograms contained a metadata reference to the function they
described. Because most clients need to get or set a subprogram for a given
function rather than the other way around, this created unneeded inefficiency.

For example, many passes needed to call the function llvm::makeSubprogramMap()
to build a mapping from functions to subprograms, and the IR linker needed to
fix up function references in a way that caused quadratic complexity in the IR
linking phase of LTO.

This change reverses the direction of the edge by storing the subprogram as
function-level metadata and removing DISubprogram's function field.

Since this is an IR change, a bitcode upgrade has been provided.

Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is
attached to the PR.

Differential Revision: http://reviews.llvm.org/D14265

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252219 91177308-0d34-0410-b5e6-96231b3b80d8
2015-11-05 22:03:56 +00:00
..
Hello
InstCombine Fix some Clang-tidy modernize warnings, other minor fixes. 2015-11-04 22:32:32 +00:00
Instrumentation DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
IPO DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
ObjCARC ObjCARC: Remove implicit ilist iterator conversions, NFC 2015-10-19 23:20:14 +00:00
Scalar Fix some Clang-tidy modernize warnings, other minor fixes. 2015-11-04 22:32:32 +00:00
Utils DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
Vectorize LoopVectorizer - skip 'bitcast' between GEP and load. 2015-11-03 10:29:34 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile