[llvm] [X86] Support encoding/decoding and lowering for APX variant SHL/SHR/SAR/SHLD/SHRD (PR #78853)

[Phoebe Wang via llvm-commits]

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@@ -20,45 +20,209 @@ multiclass ShiftRotate<string m, Format RegMRM, Format MemMRM, SDPatternOperator
 
   let Uses = uses in {
     let isConvertibleToThreeAddress = !if(!eq(m, "shl"), 1, 0) in {
-      def 8ri  : BinOpRI8U_R<m, RegMRM, Xi8, node>, Sched<[ri]>, DefEFLAGS;
-      def 16ri : BinOpRI8U_R<m, RegMRM, Xi16, node>, Sched<[ri]>, DefEFLAGS, OpSize16;
-      def 32ri : BinOpRI8U_R<m, RegMRM, Xi32, node>, Sched<[ri]>, DefEFLAGS, OpSize32;
-      def 64ri : BinOpRI8U_R<m, RegMRM, Xi64, node>, Sched<[ri]>, DefEFLAGS;
+      let Predicates = [NoNDD] in {
+        def 8ri  : BinOpRI8U_R<m, RegMRM, Xi8, node>, Sched<[ri]>, DefEFLAGS;
+        def 16ri : BinOpRI8U_R<m, RegMRM, Xi16, node>, Sched<[ri]>, DefEFLAGS, OpSize16;
+        def 32ri : BinOpRI8U_R<m, RegMRM, Xi32, node>, Sched<[ri]>, DefEFLAGS, OpSize32;
+        def 64ri : BinOpRI8U_R<m, RegMRM, Xi64, node>, Sched<[ri]>, DefEFLAGS;
+      }
+      let Predicates = [HasNDD, In64BitMode] in {
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phoebewang wrote:

I forgot the rule, when we only check `HasNDD` and when check both `HasNDD, In64BitMode`?

https://github.com/llvm/llvm-project/pull/78853