[DebugInfo][Dexter] Unreachable line stepped onto after SimplifyCFG.
In SimplifyCFG when given a conditional branch that goes to BB1 and BB2, the hoisted common terminator instruction in the two blocks, caused debug line records associated with subsequent select instructions to become ambiguous. It causes the debugger to display unreachable source lines.
Differential Revision: https://reviews.llvm.org/D53390
llvm-svn: 346481
diff --git a/llvm/lib/IR/Instruction.cpp b/llvm/lib/IR/Instruction.cpp
index 75e7413..1e32637 100644
--- a/llvm/lib/IR/Instruction.cpp
+++ b/llvm/lib/IR/Instruction.cpp
@@ -602,6 +602,13 @@
return nullptr;
}
+const Instruction *Instruction::getPrevNonDebugInstruction() const {
+ for (const Instruction *I = getPrevNode(); I; I = I->getPrevNode())
+ if (!isa<DbgInfoIntrinsic>(I))
+ return I;
+ return nullptr;
+}
+
bool Instruction::isAssociative() const {
unsigned Opcode = getOpcode();
if (isAssociative(Opcode))