-#ifndef NDEBUG
-/// CheckLineNumbers - Check if basic block instructions follow source order
-/// or not.
-static void CheckLineNumbers(const BasicBlock *BB) {
- unsigned Line = 0;
- unsigned Col = 0;
- for (BasicBlock::const_iterator BI = BB->begin(),
- BE = BB->end(); BI != BE; ++BI) {
- const DebugLoc DL = BI->getDebugLoc();
- if (DL.isUnknown()) continue;
- unsigned L = DL.getLine();
- unsigned C = DL.getCol();
- if (L < Line || (L == Line && C < Col)) {
- ++NumBBWithOutOfOrderLineInfo;
- return;
- }
- Line = L;
- Col = C;
- }
-}
-
-/// CheckLineNumbers - Check if machine basic block instructions follow source
-/// order or not.
-static void CheckLineNumbers(const MachineBasicBlock *MBB) {
- unsigned Line = 0;
- unsigned Col = 0;
- for (MachineBasicBlock::const_iterator MBI = MBB->begin(),
- MBE = MBB->end(); MBI != MBE; ++MBI) {
- const DebugLoc DL = MBI->getDebugLoc();
- if (DL.isUnknown()) continue;
- unsigned L = DL.getLine();
- unsigned C = DL.getCol();
- if (L < Line || (L == Line && C < Col)) {
- ++NumMBBWithOutOfOrderLineInfo;
- return;
- }
- Line = L;
- Col = C;
- }
+/// isFoldedOrDeadInstruction - Return true if the specified instruction is
+/// side-effect free and is either dead or folded into a generated instruction.
+/// Return false if it needs to be emitted.
+static bool isFoldedOrDeadInstruction(const Instruction *I,
+ FunctionLoweringInfo *FuncInfo) {
+ return !I->mayWriteToMemory() && // Side-effecting instructions aren't folded.
+ !isa<TerminatorInst>(I) && // Terminators aren't folded.
+ !isa<DbgInfoIntrinsic>(I) && // Debug instructions aren't folded.
+ !FuncInfo->isExportedInst(I); // Exported instrs must be computed.