[llvm] [SelectionDAG][Targets] Replace atomic_load_8/atomic_load_16 with atomic_load_*ext_8/atomic_load_*ext_16 where possible. (PR #137279)

[Craig Topper via llvm-commits]

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@@ -953,11 +953,12 @@ defm BUFFER_LOAD_DWORDX4 : MUBUF_Pseudo_Loads_Lds <
   "buffer_load_dwordx4", v4i32, /*LDSPred=*/HasGFX950Insts
 >;
 
-defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i32, atomic_load_8_global>;
+defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i32, atomic_load_aext_8_global>;
 defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i32, atomic_load_zext_8_global>;
-defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_USHORT", i32, atomic_load_16_global>;
+defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_USHORT", i32, atomic_load_aext_16_global>;
 defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_USHORT", i32, atomic_load_zext_16_global>;
-defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i16, atomic_load_8_global>;
+defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i16, atomic_load_aext_8_global>;
+defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i16, atomic_load_zext_8_global>;
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topperc wrote:

One pattern had to become two here to cover both types of extends.

https://github.com/llvm/llvm-project/pull/137279