[llvm] [AArch64] Match indexed forms of fmul/fmla/fmls (PR #144892)

[Paul Walker via llvm-commits]

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@@ -560,7 +569,13 @@ def AArch64fadd : PatFrags<(ops node:$op1, node:$op2),
 
 def AArch64fmul : PatFrags<(ops node:$op1, node:$op2),
                             [(fmul node:$op1, node:$op2),
-                             (AArch64fmul_p (SVEAllActive), node:$op1, node:$op2)]>;
+                             (AArch64fmul_p (SVEAllActive), node:$op1, node:$op2),
+                             (AArch64fmul_p (SVEAllActive), node:$op2, node:$op1)]>;
+
+def AArch64fmulidx : PatFrags<(ops node:$op1, node:$op2, node:$idx),
+                              [(AArch64fmul node:$op1, (int_aarch64_sve_dup_laneq node:$op2, node:$idx)),
+                               (AArch64fmul (int_aarch64_sve_dup_laneq node:$op2, node:$idx), node:$op1),
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paulwalker-arm wrote:

With the change to `AArch64fmul` is this swapped pattern required?

https://github.com/llvm/llvm-project/pull/144892