[Hexagon] Remove incorrect pattern for swiz

The pattern had a couple of problems:
- It was checking for loads of bytes in the reverse order to what it
  should have been looking for.
- It would replace loads of bytes with a load of a word without making
  sure that the alignment was correct.

Thanks to Eli Friedman for pointing it out.

llvm-svn: 343514

llvm/lib/Target/Hexagon/HexagonPatterns.td

@@ -1119,14 +1119,6 @@ def: Pat<(or (or (or (shl (Zext64 (and I32:$b, (i32 65535))), (i32 16)),
          (Combinew (A2_combine_ll I32:$d, I32:$c),
                    (A2_combine_ll I32:$b, I32:$a))>;
 
-def: Pat<(or (or (shl (or (shl (i32 (extloadi8 (add I32:$b, 3))),
-                               (i32 8)),
-                          (i32 (zextloadi8 (add I32:$b, 2)))),
-                      (i32 16)),
-                 (shl (i32 (zextloadi8 (add I32:$b, 1))), (i32 8))),
-             (zextloadi8 I32:$b)),
-         (A2_swiz (L2_loadri_io IntRegs:$b, 0))>;
-
 let AddedComplexity = 200 in {
   def: Pat<(or (shl I32:$Rt, (i32 16)), (and I32:$Rs, (i32 65535))),
            (A2_combine_ll I32:$Rt, I32:$Rs)>;

llvm/test/CodeGen/Hexagon/swiz.ll

@@ -1,51 +0,0 @@
-; RUN: llc -march=hexagon < %s | FileCheck %s
-; CHECK: swiz
-
-target triple = "hexagon"
-
-%s.0 = type { [4 x i32], [2 x i32], [64 x i8] }
-
-; Function Attrs: nounwind
-define void @f0(%s.0* nocapture %a0, i8* nocapture %a1, i32 %a2) #0 {
-b0:
-  %v0 = getelementptr inbounds %s.0, %s.0* %a0, i32 0, i32 2, i32 0
-  br label %b1
-
-b1:                                               ; preds = %b1, %b0
-  %v1 = phi i16 [ 16, %b0 ], [ %v22, %b1 ]
-  %v2 = phi i8* [ %v0, %b0 ], [ %v21, %b1 ]
-  %v3 = getelementptr inbounds i8, i8* %v2, i32 3
-  %v4 = load i8, i8* %v3, align 1, !tbaa !0
-  %v5 = zext i8 %v4 to i32
-  %v6 = shl nuw nsw i32 %v5, 8
-  %v7 = getelementptr inbounds i8, i8* %v2, i32 2
-  %v8 = load i8, i8* %v7, align 1, !tbaa !0
-  %v9 = zext i8 %v8 to i32
-  %v10 = or i32 %v6, %v9
-  %v11 = shl nuw i32 %v10, 16
-  %v12 = getelementptr inbounds i8, i8* %v2, i32 1
-  %v13 = load i8, i8* %v12, align 1, !tbaa !0
-  %v14 = zext i8 %v13 to i32
-  %v15 = shl nuw nsw i32 %v14, 8
-  %v16 = load i8, i8* %v2, align 1, !tbaa !0
-  %v17 = zext i8 %v16 to i32
-  %v18 = or i32 %v11, %v15
-  %v19 = or i32 %v18, %v17
-  %v20 = bitcast i8* %v2 to i32*
-  store i32 %v19, i32* %v20, align 4, !tbaa !3
-  %v21 = getelementptr inbounds i8, i8* %v2, i32 4
-  %v22 = add i16 %v1, -1
-  %v23 = icmp eq i16 %v22, 0
-  br i1 %v23, label %b2, label %b1
-
-b2:                                               ; preds = %b1
-  ret void
-}
-
-attributes #0 = { nounwind }
-
-!0 = !{!1, !1, i64 0}
-!1 = !{!"omnipotent char", !2}
-!2 = !{!"Simple C/C++ TBAA"}
-!3 = !{!4, !4, i64 0}
-!4 = !{!"int", !1}