From ce9c0faca1611041d3dbc3712c4c54c4fab58fb9 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Mon, 2 May 2022 16:20:06 +0100
Subject: [PATCH] [X86][AMX] combineLdSt - don't dereference dyn_cast. NFC

This leads to null pointer dereference warnings - use cast<> which will assert that the cast correct.
---
 llvm/lib/Target/X86/X86LowerAMXType.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/X86/X86LowerAMXType.cpp b/llvm/lib/Target/X86/X86LowerAMXType.cpp
index 0ad3e6c..81f258d 100644
--- a/llvm/lib/Target/X86/X86LowerAMXType.cpp
+++ b/llvm/lib/Target/X86/X86LowerAMXType.cpp
@@ -964,7 +964,7 @@ static void combineLoadCast(IntrinsicInst *Cast, LoadInst *LD) {
 static bool combineLdSt(SmallVectorImpl<Instruction *> &Casts) {
   bool Change = false;
   for (auto *Cast : Casts) {
-    IntrinsicInst *II = dyn_cast<IntrinsicInst>(Cast);
+    auto *II = cast<IntrinsicInst>(Cast);
     // %43 = call <256 x i32> @llvm.x86.cast.tile.to.vector(x86_amx %42)
     // store <256 x i32> %43, <256 x i32>* %p, align 64
     // -->
@@ -984,7 +984,7 @@ static bool combineLdSt(SmallVectorImpl<Instruction *> &Casts) {
         Store->eraseFromParent();
     } else { // x86_cast_vector_to_tile
       SmallVector<Instruction *, 2> DeadLoads;
-      LoadInst *Load = dyn_cast<LoadInst>(Cast->getOperand(0));
+      auto *Load = dyn_cast<LoadInst>(Cast->getOperand(0));
       if (!Load || !Load->hasOneUse())
         continue;
       // %65 = load <256 x i32>, <256 x i32>* %p, align 64
-- 
2.7.4