[AVX512] Adding new patterns for extract_subvector of vXi1

extract subvector of vXi1 from vYi1 is poorly supported by LLVM and most of the time end with an assertion.
This patch fixes this issue by adding new patterns to the TD file.

Reviewers:
1. guyblank
2. igorb
3. zvi
4. ayman
5. craig.topper

Differential Revision: https://reviews.llvm.org/D39292

Change-Id: Ideb4d7e946c8d40cfce2920891f2d89fe64c58f8

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316981 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86InstrAVX512.td

@@ -192,6 +192,7 @@ class X86KVectorVTInfo<RegisterClass _krc, RegisterClass _krcwm,
   ValueType KVT = _vt;
 }
 
+def v1i1_info : X86KVectorVTInfo<VK1, VK1WM, v1i1>;
 def v2i1_info : X86KVectorVTInfo<VK2, VK2WM, v2i1>;
 def v4i1_info : X86KVectorVTInfo<VK4, VK4WM, v4i1>;
 def v8i1_info : X86KVectorVTInfo<VK8, VK8WM, v8i1>;
@@ -2935,21 +2936,48 @@ defm : operation_subvector_mask_lowering<VK16, v16i1, VK64, v64i1>;
 
 defm : operation_subvector_mask_lowering<VK32, v32i1, VK64, v64i1>;
 
-def : Pat<(v2i1 (extract_subvector (v4i1 VK4:$src), (iPTR 2))),
-          (v2i1 (COPY_TO_REGCLASS
-                  (KSHIFTRWri (COPY_TO_REGCLASS VK4:$src, VK16), (i8 2)),
-                   VK2))>;
-def : Pat<(v4i1 (extract_subvector (v8i1 VK8:$src), (iPTR 4))),
-          (v4i1 (COPY_TO_REGCLASS
-                  (KSHIFTRWri (COPY_TO_REGCLASS VK8:$src, VK16), (i8 4)),
-                   VK4))>;
-def : Pat<(v8i1 (extract_subvector (v16i1 VK16:$src), (iPTR 8))),
-          (v8i1 (COPY_TO_REGCLASS (KSHIFTRWri VK16:$src, (i8 8)), VK8))>;
-def : Pat<(v16i1 (extract_subvector (v32i1 VK32:$src), (iPTR 16))),
-          (v16i1 (COPY_TO_REGCLASS (KSHIFTRDri VK32:$src, (i8 16)), VK16))>;
-def : Pat<(v32i1 (extract_subvector (v64i1 VK64:$src), (iPTR 32))),
-          (v32i1 (COPY_TO_REGCLASS (KSHIFTRQri VK64:$src, (i8 32)), VK32))>;
 
+multiclass vextract_for_mask_to_mask<string InstrStr, X86KVectorVTInfo From,
+                                     X86KVectorVTInfo To, Predicate prd> {
+let Predicates = [prd] in
+  def :
+    Pat<(To.KVT(extract_subvector(From.KVT From.KRC:$src), (iPTR imm:$imm8))),
+        (To.KVT(COPY_TO_REGCLASS
+                  (!cast<Instruction>(InstrStr#"ri") From.KVT:$src,
+                      (i8 imm:$imm8)), To.KRC))>;
+}
+
+multiclass vextract_for_mask_to_mask_legal_w<X86KVectorVTInfo From,
+                                             X86KVectorVTInfo To> {
+def :
+  Pat<(To.KVT(extract_subvector(From.KVT From.KRC:$src), (iPTR imm:$imm8))),
+      (To.KVT(COPY_TO_REGCLASS
+               (KSHIFTRWri(COPY_TO_REGCLASS From.KRC:$src, VK16),
+                   (i8 imm:$imm8)), To.KRC))>;
+}
+
+defm : vextract_for_mask_to_mask_legal_w<v2i1_info, v1i1_info>;
+defm : vextract_for_mask_to_mask_legal_w<v4i1_info, v1i1_info>;
+defm : vextract_for_mask_to_mask_legal_w<v8i1_info, v1i1_info>;
+defm : vextract_for_mask_to_mask_legal_w<v4i1_info, v2i1_info>;
+defm : vextract_for_mask_to_mask_legal_w<v8i1_info, v2i1_info>;
+defm : vextract_for_mask_to_mask_legal_w<v8i1_info, v4i1_info>;
+
+defm : vextract_for_mask_to_mask<"KSHIFTRW", v16i1_info, v1i1_info, HasAVX512>;
+defm : vextract_for_mask_to_mask<"KSHIFTRD", v32i1_info, v1i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRQ", v64i1_info, v1i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRW", v16i1_info, v2i1_info, HasAVX512>;
+defm : vextract_for_mask_to_mask<"KSHIFTRD", v32i1_info, v2i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRQ", v64i1_info, v2i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRW", v16i1_info, v4i1_info, HasAVX512>;
+defm : vextract_for_mask_to_mask<"KSHIFTRD", v32i1_info, v4i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRQ", v64i1_info, v4i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRW", v16i1_info, v8i1_info, HasAVX512>;
+defm : vextract_for_mask_to_mask<"KSHIFTRD", v32i1_info, v8i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRQ", v64i1_info, v8i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRD", v32i1_info, v16i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRQ", v64i1_info, v16i1_info, HasBWI>;
+defm : vextract_for_mask_to_mask<"KSHIFTRQ", v64i1_info, v32i1_info, HasBWI>;
 
 // Patterns for kmask shift
 multiclass mask_shift_lowering<RegisterClass RC, ValueType VT> {