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Resurrect the assertion removed by r227717

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Summary: MSVC can compile "LoopID->getOperand(0) == LoopID" when LoopID is MDNode*.

Test Plan: no regression

Reviewers: mkuper

Subscribers: jholewinski, llvm-commits

Differential Revision: http://reviews.llvm.org/D7327

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227853 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jingyue Wu
2015-02-02 20:41:11 +00:00
parent 48da191fb3
commit 62d535ff3c
4 changed files with 11 additions and 12 deletions
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7
lib/Transforms/Utils/LoopUnroll.cpp
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@ -553,16 +553,17 @@ bool llvm::UnrollLoop(Loop *L, unsigned Count, unsigned TripCount,
/// Given an llvm.loop loop id metadata node, returns the loop hint metadata
/// node with the given name (for example, "llvm.loop.unroll.count"). If no
/// such metadata node exists, then nullptr is returned.
const MDNode *llvm::GetUnrollMetadata(const MDNode *LoopID, StringRef Name) {
MDNode *llvm::GetUnrollMetadata(MDNode *LoopID, StringRef Name) {
// First operand should refer to the loop id itself.
assert(LoopID->getNumOperands() > 0 && "requires at least one operand");
assert(LoopID->getOperand(0) == LoopID && "invalid loop id");
for (unsigned i = 1, e = LoopID->getNumOperands(); i < e; ++i) {
const MDNode *MD = dyn_cast<MDNode>(LoopID->getOperand(i));
MDNode *MD = dyn_cast<MDNode>(LoopID->getOperand(i));
if (!MD)
continue;
const MDString *S = dyn_cast<MDString>(MD->getOperand(0));
MDString *S = dyn_cast<MDString>(MD->getOperand(0));
if (!S)
continue;