[llvm] eabf7ec - [GlobalISel] Fix misaligned read after #74429

[Vitaly Buka via llvm-commits]

Author: Vitaly Buka
Date: 2023-12-13T14:04:59-08:00
New Revision: eabf7ec3f3d4688ea0f9da24038462362837d7ff

URL: https://github.com/llvm/llvm-project/commit/eabf7ec3f3d4688ea0f9da24038462362837d7ff
DIFF: https://github.com/llvm/llvm-project/commit/eabf7ec3f3d4688ea0f9da24038462362837d7ff.diff

LOG: [GlobalISel] Fix misaligned read after #74429

Added: 
    

Modified: 
    llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h

Removed: 
    


################################################################################
diff  --git a/llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h b/llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h
index 73308925e9142d..724f39634297a4 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h
@@ -690,7 +690,9 @@ class GIMatchTableExecutor {
   bool isObviouslySafeToFold(MachineInstr &MI, MachineInstr &IntoMI) const;
 
   template <typename Ty> static Ty readBytesAs(const uint8_t *MatchTable) {
-    return *reinterpret_cast<const Ty *>(MatchTable);
+    Ty res;
+    memcpy(&res, MatchTable, sizeof(res));
+    return res;
   }
 };