[InstCombine] Add comments. NFC.

dtcxzyw · dtcxzyw · commit 0db560f93b33 · 2024-10-25T21:21:42.000+08:00
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -3753,6 +3753,8 @@ Instruction *InstCombinerImpl::visitBranchInst(BranchInst &BI) {
   }
 
   // Replace all dominated uses of the condition with true/false
+  // Ignore constant expressions to avoid iterating over uses on other
+  // functions.
   if (!isa<Constant>(Cond) && BI.getSuccessor(0) != BI.getSuccessor(1)) {
     for (auto &U : make_early_inc_range(Cond->uses())) {
       BasicBlockEdge Edge0(BI.getParent(), BI.getSuccessor(0));

Original file line number	Diff line number	Diff line change
`@@ -3753,6 +3753,8 @@ Instruction *InstCombinerImpl::visitBranchInst(BranchInst &BI) {`
`3753`	`3753`	`}`
`3754`	`3754`
`3755`	`3755`	`// Replace all dominated uses of the condition with true/false`
	`3756`	`+ // Ignore constant expressions to avoid iterating over uses on other`
	`3757`	`+ // functions.`
`3756`	`3758`	`if (!isa<Constant>(Cond) && BI.getSuccessor(0) != BI.getSuccessor(1)) {`
`3757`	`3759`	`for (auto &U : make_early_inc_range(Cond->uses())) {`
`3758`	`3760`	`BasicBlockEdge Edge0(BI.getParent(), BI.getSuccessor(0));`