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[stackprotector] Added significantly longer comment to FindPotentialTailCall to make clear its relationship to llvm::isInTailCallPosition.

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llvm-svn: 188770
This commit is contained in:
Michael Gottesman 2013-08-20 08:56:23 +00:00
parent 708165a1b3
commit 1bad711e58
1 changed files with 6 additions and 1 deletions
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7
lib/CodeGen/StackProtector.cpp
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@ -280,7 +280,12 @@ static bool InstructionWillNotHaveChain(const Instruction *I) {
/// Identify if RI has a previous instruction in the "Tail Position" and return
/// it. Otherwise return 0.
///
/// This is based off of the code in llvm::isInTailCallPosition
/// This is based off of the code in llvm::isInTailCallPosition. The difference
/// is that it inverts the first part of llvm::isInTailCallPosition since
/// isInTailCallPosition is checking if a call is in a tail call position, and
/// we are searching for an unknown tail call that might be in the tail call
/// position. Once we find the call though, the code uses the same refactored
/// code, returnTypeIsEligibleForTailCall.
static CallInst *FindPotentialTailCall(BasicBlock *BB, ReturnInst *RI,
const TargetLoweringBase *TLI) {
// Establish a reasonable upper bound on the maximum amount of instructions we