From 70be2f0deb0f49e1f454b6d8e80cf56a24322a54 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Fri, 24 May 2024 17:51:19 +0200
Subject: Merge llvm-project release/18.x llvmorg-18.1.6-0-g1118c2e05e67

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.6-0-g1118c2e05e67.

PR:		276104
MFC after:	3 days

(cherry picked from commit 3a0793336edfc21cb6d4c8c5c5d7f1665f3e6c5a)
---
 .../llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp | 57 +++++++---------------
 1 file changed, 18 insertions(+), 39 deletions(-)

(limited to 'contrib/llvm-project/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp')

diff --git a/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp b/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp
index d9465e86d896..ebd876d50c44 100644
--- a/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp
+++ b/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp
@@ -23,6 +23,7 @@
 #include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/ValueSymbolTable.h"
 #include "llvm/Pass.h"
@@ -116,9 +117,20 @@ private:
 // sure that they can be replaced.
 static bool hasReplaceableUsers(GlobalVariable &GV) {
   for (User *CurrentUser : GV.users()) {
-    // Instruction users are always valid.
-    if (isa<Instruction>(CurrentUser))
+    if (auto *I = dyn_cast<Instruction>(CurrentUser)) {
+      // Do not merge globals in exception pads.
+      if (I->isEHPad())
+        return false;
+
+      if (auto *II = dyn_cast<IntrinsicInst>(I)) {
+        // Some intrinsics require a plain global.
+        if (II->getIntrinsicID() == Intrinsic::eh_typeid_for)
+          return false;
+      }
+
+      // Other instruction users are always valid.
       continue;
+    }
 
     // We cannot replace GlobalValue users because they are not just nodes
     // in IR. To replace a user like this we would need to create a new
@@ -302,14 +314,6 @@ void PPCMergeStringPool::replaceUsesWithGEP(GlobalVariable *GlobalToReplace,
     Users.push_back(CurrentUser);
 
   for (User *CurrentUser : Users) {
-    Instruction *UserInstruction = dyn_cast<Instruction>(CurrentUser);
-    Constant *UserConstant = dyn_cast<Constant>(CurrentUser);
-
-    // At this point we expect that the user is either an instruction or a
-    // constant.
-    assert((UserConstant || UserInstruction) &&
-           "Expected the user to be an instruction or a constant.");
-
     // The user was not found so it must have been replaced earlier.
     if (!userHasOperand(CurrentUser, GlobalToReplace))
       continue;
@@ -318,38 +322,13 @@ void PPCMergeStringPool::replaceUsesWithGEP(GlobalVariable *GlobalToReplace,
     if (isa<GlobalValue>(CurrentUser))
       continue;
 
-    if (!UserInstruction) {
-      // User is a constant type.
-      Constant *ConstGEP = ConstantExpr::getInBoundsGetElementPtr(
-          PooledStructType, GPool, Indices);
-      UserConstant->handleOperandChange(GlobalToReplace, ConstGEP);
-      continue;
-    }
-
-    if (PHINode *UserPHI = dyn_cast<PHINode>(UserInstruction)) {
-      // GEP instructions cannot be added before PHI nodes.
-      // With getInBoundsGetElementPtr we create the GEP and then replace it
-      // inline into the PHI.
-      Constant *ConstGEP = ConstantExpr::getInBoundsGetElementPtr(
-          PooledStructType, GPool, Indices);
-      UserPHI->replaceUsesOfWith(GlobalToReplace, ConstGEP);
-      continue;
-    }
-    // The user is a valid instruction that is not a PHINode.
-    GetElementPtrInst *GEPInst =
-        GetElementPtrInst::Create(PooledStructType, GPool, Indices);
-    GEPInst->insertBefore(UserInstruction);
-
-    LLVM_DEBUG(dbgs() << "Inserting GEP before:\n");
-    LLVM_DEBUG(UserInstruction->dump());
-
+    Constant *ConstGEP = ConstantExpr::getInBoundsGetElementPtr(
+        PooledStructType, GPool, Indices);
     LLVM_DEBUG(dbgs() << "Replacing this global:\n");
     LLVM_DEBUG(GlobalToReplace->dump());
     LLVM_DEBUG(dbgs() << "with this:\n");
-    LLVM_DEBUG(GEPInst->dump());
-
-    // After the GEP is inserted the GV can be replaced.
-    CurrentUser->replaceUsesOfWith(GlobalToReplace, GEPInst);
+    LLVM_DEBUG(ConstGEP->dump());
+    GlobalToReplace->replaceAllUsesWith(ConstGEP);
   }
 }
 
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