maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[globalisel][cse] Merge debug locations when CSE'ing 

Reviewed By: aditya_nandakumar

Differential Revision: https://reviews.llvm.org/D78388
This commit is contained in:
Daniel Sanders 2020-07-28 13:56:51 -07:00
parent e87356b498
commit abf1ed70d6
1 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
llvm/lib/CodeGen/GlobalISel/CSEMIRBuilder.cpp
View File

@ -13,6 +13,7 @@
#include "llvm/CodeGen/GlobalISel/CSEMIRBuilder.h"
#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
#include "llvm/IR/DebugInfoMetadata.h"
using namespace llvm;
@ -134,6 +135,21 @@ CSEMIRBuilder::generateCopiesIfRequired(ArrayRef<DstOp> DstOps,
if (Op.getDstOpKind() == DstOp::DstType::Ty_Reg)
return buildCopy(Op.getReg(), MIB.getReg(0));
}
// If we didn't generate a copy then we're re-using an existing node directly
// instead of emitting any code. Merge the debug location we wanted to emit
// into the instruction we're CSE'ing with. Debug locations arent part of the
// profile so we don't need to recompute it.
if (getDebugLoc()) {
GISelChangeObserver *Observer = getState().Observer;
if (Observer)
Observer->changingInstr(*MIB);
MIB->setDebugLoc(
DILocation::getMergedLocation(MIB->getDebugLoc(), getDebugLoc()));
if (Observer)
Observer->changedInstr(*MIB);
}
return MIB;
}