From: Guy Blank <guy.blank@intel.com>
Date: Wed, 21 Jun 2017 07:38:41 +0000 (+0000)
Subject: [DAGCombiner] Add another combine from build vector to shuffle
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=415c6676800a19b6615ab378ac64609c30f31b44;p=llvm

[DAGCombiner] Add another combine from build vector to shuffle

Add support for combining a build vector to a shuffle.
When the build vector is of extracted elements from 2 vectors (vec1, vec2) where vec2 is 2 times smaller than vec1.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305883 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 255ddcacfdb..b7f9dad23ae 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -14055,6 +14055,11 @@ SDValue DAGCombiner::createBuildVecShuffle(const SDLoc &DL, SDNode *N,
         // when we start sorting the vectors by type.
         return SDValue();
       }
+    } else if (InVT2.getSizeInBits() * 2 == VT.getSizeInBits() &&
+               InVT1.getSizeInBits() == VT.getSizeInBits()) {
+      SmallVector<SDValue, 2> ConcatOps(2, DAG.getUNDEF(InVT2));
+      ConcatOps[0] = VecIn2;
+      VecIn2 = DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, ConcatOps);
     } else {
       // TODO: Support cases where the length mismatch isn't exactly by a
       // factor of 2.
diff --git a/test/CodeGen/AArch64/arm64-neon-copy.ll b/test/CodeGen/AArch64/arm64-neon-copy.ll
index a7b95e71791..16834b7e315 100644
--- a/test/CodeGen/AArch64/arm64-neon-copy.ll
+++ b/test/CodeGen/AArch64/arm64-neon-copy.ll
@@ -1378,7 +1378,7 @@ entry:
 
 define <2 x i64> @test_concat_v2i64_v2i64_v1i64(<2 x i64> %x, <1 x i64> %y) #0 {
 ; CHECK-LABEL: test_concat_v2i64_v2i64_v1i64:
-; CHECK: ins {{v[0-9]+}}.d[1], {{v[0-9]+}}.d[0]
+; CHECK: zip1 {{v[0-9]+}}.2d, {{v[0-9]+}}.2d, {{v[0-9]+}}.2d
 entry:
   %vecext = extractelement <2 x i64> %x, i32 0
   %vecinit = insertelement <2 x i64> undef, i64 %vecext, i32 0
diff --git a/test/CodeGen/X86/vector-shuffle-v48.ll b/test/CodeGen/X86/vector-shuffle-v48.ll
index 885b5c86ee8..06b7c2e6472 100644
--- a/test/CodeGen/X86/vector-shuffle-v48.ll
+++ b/test/CodeGen/X86/vector-shuffle-v48.ll
@@ -3,42 +3,18 @@
 define <32 x i8> @foo(<48 x i8>* %x0, <16 x i32> %x1, <16 x i32> %x2) {
 ; CHECK-LABEL: foo:
 ; CHECK:       # BB#0:
-; CHECK-NEXT:    vmovdqu 32(%rdi), %xmm0
-; CHECK-NEXT:    vmovdqu (%rdi), %ymm1
-; CHECK-NEXT:    vextracti128 $1, %ymm1, %xmm2
-; CHECK-NEXT:    vpextrb $0, %xmm2, %eax
-; CHECK-NEXT:    vpshufb {{.*#+}} xmm1 = xmm1[0,1,3,4,6,7,9,10,12,13,15],zero,zero,zero,zero,zero
-; CHECK-NEXT:    vpinsrb $11, %eax, %xmm1, %xmm1
-; CHECK-NEXT:    vpextrb $2, %xmm2, %eax
-; CHECK-NEXT:    vpinsrb $12, %eax, %xmm1, %xmm1
-; CHECK-NEXT:    vpextrb $3, %xmm2, %eax
-; CHECK-NEXT:    vpinsrb $13, %eax, %xmm1, %xmm1
-; CHECK-NEXT:    vpextrb $5, %xmm2, %eax
-; CHECK-NEXT:    vpinsrb $14, %eax, %xmm1, %xmm1
-; CHECK-NEXT:    vpextrb $6, %xmm2, %eax
-; CHECK-NEXT:    vpinsrb $15, %eax, %xmm1, %xmm1
-; CHECK-NEXT:    vpextrb $1, %xmm0, %eax
-; CHECK-NEXT:    vpshufb {{.*#+}} xmm2 = xmm2[8,9,11,12,14,15],zero,zero,zero,zero,zero,zero,zero,zero,zero,zero
-; CHECK-NEXT:    vpinsrb $6, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $2, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $7, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $4, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $8, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $5, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $9, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $7, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $10, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $8, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $11, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $10, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $12, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $11, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $13, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $13, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $14, %eax, %xmm2, %xmm2
-; CHECK-NEXT:    vpextrb $14, %xmm0, %eax
-; CHECK-NEXT:    vpinsrb $15, %eax, %xmm2, %xmm0
-; CHECK-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
+; CHECK-NEXT:    vmovdqu (%rdi), %ymm0
+; CHECK-NEXT:    vmovdqu 32(%rdi), %xmm1
+; CHECK-NEXT:    vpshufb {{.*#+}} xmm1 = xmm1[u,u,u,u,u,u,1,2,4,5,7,8,10,11,13,14]
+; CHECK-NEXT:    vinserti128 $1, %xmm1, %ymm0, %ymm1
+; CHECK-NEXT:    vextracti128 $1, %ymm0, %xmm2
+; CHECK-NEXT:    vpshufb {{.*#+}} xmm3 = zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,xmm2[0,2,3,5,6]
+; CHECK-NEXT:    vpshufb {{.*#+}} xmm0 = xmm0[0,1,3,4,6,7,9,10,12,13,15],zero,zero,zero,zero,zero
+; CHECK-NEXT:    vpor %xmm3, %xmm0, %xmm0
+; CHECK-NEXT:    vpshufb {{.*#+}} xmm2 = xmm2[8,9,11,12,14,15,u,u,u,u,u,u,u,u,u,u]
+; CHECK-NEXT:    vinserti128 $1, %xmm2, %ymm0, %ymm0
+; CHECK-NEXT:    vmovdqa {{.*#+}} ymm2 = [255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,0,0,0,0,0,0,0,0,0,0]
+; CHECK-NEXT:    vpblendvb %ymm2, %ymm0, %ymm1, %ymm0
 ; CHECK-NEXT:    retq
   %1 = load <48 x i8>, <48 x i8>* %x0, align 1
   %2 = shufflevector <48 x i8> %1, <48 x i8> undef, <32 x i32> <i32 0, i32 1, i32 3, i32 4, i32 6, i32 7, i32 9, i32 10, i32 12, i32 13, i32 15, i32 16, i32 18, i32 19, i32 21, i32 22, i32 24, i32 25, i32 27, i32 28, i32 30, i32 31, i32 33, i32 34, i32 36, i32 37, i32 39, i32 40, i32 42, i32 43, i32 45, i32 46>