[llvm] [InstCombine] Avoid folding `select(umin(X, Y), X)` with non-constant mask (PR #143020)

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github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
index 930819d24..0e5c95c74 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -1655,7 +1655,8 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
     return visitFree(CI, FreedOp);
 
   if (Function *F = CI.getCalledFunction()) {
-    if (F->getIntrinsicID() == Intrinsic::umin || F->getIntrinsicID() == Intrinsic::umax) {
+    if (F->getIntrinsicID() == Intrinsic::umin ||
+        F->getIntrinsicID() == Intrinsic::umax) {
       for (Value *Arg : CI.args()) {
         auto *SI = dyn_cast<SelectInst>(Arg);
         if (!SI)
@@ -1665,8 +1666,11 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
         auto *FalseC = dyn_cast<Constant>(SI->getFalseValue());
 
         // Block only if the select is masking, e.g. select(cond, val, -1)
-        if ((TrueC && TrueC->isAllOnesValue()) || (FalseC && FalseC->isAllOnesValue())) {
-          LLVM_DEBUG(dbgs() << "InstCombine: skipping umin/umax folding for masked select\n");
+        if ((TrueC && TrueC->isAllOnesValue()) ||
+            (FalseC && FalseC->isAllOnesValue())) {
+          LLVM_DEBUG(
+              dbgs()
+              << "InstCombine: skipping umin/umax folding for masked select\n");
           return nullptr;
         }
       }

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https://github.com/llvm/llvm-project/pull/143020