[llvm] [LLVMContext] Add OB_align assume bundle op ID. (PR #158078)
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Thu Sep 11 06:50:58 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-ir
Author: Florian Hahn (fhahn)
<details>
<summary>Changes</summary>
Assume operand bundles are emitted in a few more places now, including used in various places in libc++. Add a dedicated ID for them.
---
Full diff: https://github.com/llvm/llvm-project/pull/158078.diff
3 Files Affected:
- (modified) llvm/include/llvm/IR/LLVMContext.h (+2)
- (modified) llvm/lib/IR/LLVMContext.cpp (+3-1)
- (modified) llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp (+1-1)
``````````diff
diff --git a/llvm/include/llvm/IR/LLVMContext.h b/llvm/include/llvm/IR/LLVMContext.h
index 852a3a4e2f638..5972dcb637dfa 100644
--- a/llvm/include/llvm/IR/LLVMContext.h
+++ b/llvm/include/llvm/IR/LLVMContext.h
@@ -97,6 +97,8 @@ class LLVMContext {
OB_ptrauth = 7, // "ptrauth"
OB_kcfi = 8, // "kcfi"
OB_convergencectrl = 9, // "convergencectrl"
+ OB_align = 10, // "align"
+ OB_LastBundleID = OB_align // Marker for last bundle ID
};
/// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
diff --git a/llvm/lib/IR/LLVMContext.cpp b/llvm/lib/IR/LLVMContext.cpp
index 57532cd491dd6..335c210c10e1a 100644
--- a/llvm/lib/IR/LLVMContext.cpp
+++ b/llvm/lib/IR/LLVMContext.cpp
@@ -53,6 +53,8 @@ static StringRef knownBundleName(unsigned BundleTagID) {
return "kcfi";
case LLVMContext::OB_convergencectrl:
return "convergencectrl";
+ case LLVMContext::OB_align:
+ return "align";
default:
llvm_unreachable("unknown bundle id");
}
@@ -76,7 +78,7 @@ LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) {
}
for (unsigned BundleTagID = LLVMContext::OB_deopt;
- BundleTagID <= LLVMContext::OB_convergencectrl; ++BundleTagID) {
+ BundleTagID <= LLVMContext::OB_LastBundleID; ++BundleTagID) {
[[maybe_unused]] const auto *Entry =
pImpl->getOrInsertBundleTag(knownBundleName(BundleTagID));
assert(Entry->second == BundleTagID && "operand bundle id drifted!");
diff --git a/llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp b/llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
index 8555ef5c22f82..e54a2e54f9943 100644
--- a/llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
+++ b/llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
@@ -163,7 +163,7 @@ bool AlignmentFromAssumptionsPass::extractAlignmentInfo(CallInst *I,
const SCEV *&OffSCEV) {
Type *Int64Ty = Type::getInt64Ty(I->getContext());
OperandBundleUse AlignOB = I->getOperandBundleAt(Idx);
- if (AlignOB.getTagName() != "align")
+ if (AlignOB.getTagID() != LLVMContext::OB_align)
return false;
assert(AlignOB.Inputs.size() >= 2);
AAPtr = AlignOB.Inputs[0].get();
``````````
</details>
https://github.com/llvm/llvm-project/pull/158078
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