[llvm] [AArch64] MachineCombiner msub matching (PR #84267)

[David Green via llvm-commits]

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@@ -6110,8 +6110,8 @@ static bool getMaddPatterns(MachineInstr &Root,
     setFound(AArch64::MADDXrrr, 2, AArch64::XZR, MCP::MULADDX_OP2);
     break;
   case AArch64::SUBWrr:
-    setFound(AArch64::MADDWrrr, 1, AArch64::WZR, MCP::MULSUBW_OP1);
     setFound(AArch64::MADDWrrr, 2, AArch64::WZR, MCP::MULSUBW_OP2);
+    setFound(AArch64::MADDWrrr, 1, AArch64::WZR, MCP::MULSUBW_OP1);
     break;
   case AArch64::SUBXrr:
     setFound(AArch64::MADDXrrr, 1, AArch64::XZR, MCP::MULSUBX_OP1);
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davemgreen wrote:

Would the same thing be needed here too for 64bit?

https://github.com/llvm/llvm-project/pull/84267