[DAG] Fold extract_subvector(insert_subvector(x,y,c1),c2) --> extract_subvector(y,c2-c1) #87925

RKSimon · 2024-04-07T13:43:58Z

If the extract_subvector is cheap, attempt to extract directly from an inserted subvector

llvmbot · 2024-04-07T13:44:28Z

@llvm/pr-subscribers-backend-x86

@llvm/pr-subscribers-llvm-selectiondag

Author: Simon Pilgrim (RKSimon)

Changes

If the extract_subvector is cheap, attempt to extract directly from an inserted subvector

Patch is 181.54 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/87925.diff

8 Files Affected:

(modified) llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (+18)
(modified) llvm/test/CodeGen/X86/any_extend_vector_inreg_of_broadcast.ll (+20-22)
(modified) llvm/test/CodeGen/X86/dpbusd.ll (+1-1)
(modified) llvm/test/CodeGen/X86/dpbusd_i4.ll (+1-1)
(modified) llvm/test/CodeGen/X86/insertelement-var-index.ll (+6-8)
(modified) llvm/test/CodeGen/X86/vector-interleaved-load-i16-stride-3.ll (+636-664)
(modified) llvm/test/CodeGen/X86/vector-interleaved-store-i8-stride-7.ll (+298-304)
(modified) llvm/test/CodeGen/X86/zero_extend_vector_inreg_of_broadcast.ll (+14-14)

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index f20080c8f10803..fb1dca6eb0da47 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -24459,6 +24459,24 @@ SDValue DAGCombiner::visitEXTRACT_SUBVECTOR(SDNode *N) {
       if (!LegalOperations || TLI.isOperationLegal(ISD::SPLAT_VECTOR, NVT))
         return DAG.getSplatVector(NVT, SDLoc(N), V.getOperand(0));
 
+  // extract_subvector(insert_subvector(x,y,c1),c2)
+  //  --> extract_subvector(y,c2-c1)
+  // iff we're just extracting from the inserted subvector.
+  if (V.getOpcode() == ISD::INSERT_SUBVECTOR && !NVT.isScalableVector() &&
+      !V.getValueType().isScalableVector()) {
+    SDValue InsSub = V.getOperand(1);
+    EVT InsSubVT = InsSub.getValueType();
+    unsigned NumInsElts = InsSubVT.getVectorMinNumElements();
+    unsigned InsIdx = V.getConstantOperandVal(2);
+    unsigned NumSubElts = NVT.getVectorMinNumElements();
+    if (InsIdx <= ExtIdx && (ExtIdx + NumSubElts) <= (InsIdx + NumInsElts) &&
+        TLI.isExtractSubvectorCheap(NVT, InsSubVT, ExtIdx - InsIdx)) {
+      SDLoc DL(N);
+      return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, NVT, InsSub,
+                         DAG.getVectorIdxConstant(ExtIdx - InsIdx, DL));
+    }
+  }
+
   // Try to move vector bitcast after extract_subv by scaling extraction index:
   // extract_subv (bitcast X), Index --> bitcast (extract_subv X, Index')
   if (V.getOpcode() == ISD::BITCAST &&
diff --git a/llvm/test/CodeGen/X86/any_extend_vector_inreg_of_broadcast.ll b/llvm/test/CodeGen/X86/any_extend_vector_inreg_of_broadcast.ll
index 4242d8483e7233..39c7ce1413d1b3 100644
--- a/llvm/test/CodeGen/X86/any_extend_vector_inreg_of_broadcast.ll
+++ b/llvm/test/CodeGen/X86/any_extend_vector_inreg_of_broadcast.ll
@@ -314,8 +314,8 @@ define void @vec64_i16_widen_to_i32_factor2_broadcast_to_v2i32_factor2(ptr %in.v
 ;
 ; AVX512F-LABEL: vec64_i16_widen_to_i32_factor2_broadcast_to_v2i32_factor2:
 ; AVX512F:       # %bb.0:
-; AVX512F-NEXT:    vmovdqa (%rdi), %ymm0
-; AVX512F-NEXT:    vpaddb (%rsi), %ymm0, %ymm0
+; AVX512F-NEXT:    vmovdqa (%rdi), %xmm0
+; AVX512F-NEXT:    vpaddb (%rsi), %xmm0, %xmm0
 ; AVX512F-NEXT:    vpshufb {{.*#+}} xmm0 = xmm0[0,1,10,11,0,1,14,15,u,u,u,u,u,u,u,u]
 ; AVX512F-NEXT:    vpaddb (%rdx), %ymm0, %ymm0
 ; AVX512F-NEXT:    vmovdqa %ymm0, (%rcx)
@@ -324,8 +324,8 @@ define void @vec64_i16_widen_to_i32_factor2_broadcast_to_v2i32_factor2(ptr %in.v
 ;
 ; AVX512DQ-LABEL: vec64_i16_widen_to_i32_factor2_broadcast_to_v2i32_factor2:
 ; AVX512DQ:       # %bb.0:
-; AVX512DQ-NEXT:    vmovdqa (%rdi), %ymm0
-; AVX512DQ-NEXT:    vpaddb (%rsi), %ymm0, %ymm0
+; AVX512DQ-NEXT:    vmovdqa (%rdi), %xmm0
+; AVX512DQ-NEXT:    vpaddb (%rsi), %xmm0, %xmm0
 ; AVX512DQ-NEXT:    vpshufb {{.*#+}} xmm0 = xmm0[0,1,10,11,0,1,14,15,u,u,u,u,u,u,u,u]
 ; AVX512DQ-NEXT:    vpaddb (%rdx), %ymm0, %ymm0
 ; AVX512DQ-NEXT:    vmovdqa %ymm0, (%rcx)
@@ -981,7 +981,7 @@ define void @vec128_i32_widen_to_i64_factor2_broadcast_to_v2i64_factor2(ptr %in.
 ; AVX512F-NEXT:    vpmovsxbd {{.*#+}} xmm0 = [0,5,0,7]
 ; AVX512F-NEXT:    vmovdqa (%rdi), %ymm1
 ; AVX512F-NEXT:    vpaddb (%rsi), %ymm1, %ymm1
-; AVX512F-NEXT:    vpermd %zmm1, %zmm0, %zmm0
+; AVX512F-NEXT:    vpermd %ymm1, %ymm0, %ymm0
 ; AVX512F-NEXT:    vpaddb (%rdx), %ymm0, %ymm0
 ; AVX512F-NEXT:    vmovdqa %ymm0, (%rcx)
 ; AVX512F-NEXT:    vzeroupper
@@ -992,7 +992,7 @@ define void @vec128_i32_widen_to_i64_factor2_broadcast_to_v2i64_factor2(ptr %in.
 ; AVX512DQ-NEXT:    vpmovsxbd {{.*#+}} xmm0 = [0,5,0,7]
 ; AVX512DQ-NEXT:    vmovdqa (%rdi), %ymm1
 ; AVX512DQ-NEXT:    vpaddb (%rsi), %ymm1, %ymm1
-; AVX512DQ-NEXT:    vpermd %zmm1, %zmm0, %zmm0
+; AVX512DQ-NEXT:    vpermd %ymm1, %ymm0, %ymm0
 ; AVX512DQ-NEXT:    vpaddb (%rdx), %ymm0, %ymm0
 ; AVX512DQ-NEXT:    vmovdqa %ymm0, (%rcx)
 ; AVX512DQ-NEXT:    vzeroupper
@@ -3507,13 +3507,12 @@ define void @vec384_i16_widen_to_i32_factor2_broadcast_to_v12i32_factor12(ptr %i
 ;
 ; AVX512F-LABEL: vec384_i16_widen_to_i32_factor2_broadcast_to_v12i32_factor12:
 ; AVX512F:       # %bb.0:
-; AVX512F-NEXT:    vmovdqa (%rdi), %ymm0
-; AVX512F-NEXT:    vpaddb (%rsi), %ymm0, %ymm0
+; AVX512F-NEXT:    vmovdqa (%rdi), %xmm0
 ; AVX512F-NEXT:    vmovdqa 48(%rdi), %xmm1
 ; AVX512F-NEXT:    vpaddb 48(%rsi), %xmm1, %xmm1
-; AVX512F-NEXT:    vpbroadcastw %xmm0, %ymm2
-; AVX512F-NEXT:    vpblendw {{.*#+}} ymm1 = ymm2[0],ymm1[1],ymm2[2],ymm1[3],ymm2[4],ymm1[5],ymm2[6],ymm1[7],ymm2[8],ymm1[9],ymm2[10],ymm1[11],ymm2[12],ymm1[13],ymm2[14],ymm1[15]
+; AVX512F-NEXT:    vpaddb (%rsi), %xmm0, %xmm0
 ; AVX512F-NEXT:    vpbroadcastw %xmm0, %ymm0
+; AVX512F-NEXT:    vpblendw {{.*#+}} ymm1 = ymm0[0],ymm1[1],ymm0[2],ymm1[3],ymm0[4],ymm1[5],ymm0[6],ymm1[7],ymm0[8],ymm1[9],ymm0[10],ymm1[11],ymm0[12],ymm1[13],ymm0[14],ymm1[15]
 ; AVX512F-NEXT:    vpaddb (%rdx), %ymm1, %ymm1
 ; AVX512F-NEXT:    vpaddb 32(%rdx), %ymm0, %ymm0
 ; AVX512F-NEXT:    vmovdqa %ymm0, 32(%rcx)
@@ -3523,13 +3522,12 @@ define void @vec384_i16_widen_to_i32_factor2_broadcast_to_v12i32_factor12(ptr %i
 ;
 ; AVX512DQ-LABEL: vec384_i16_widen_to_i32_factor2_broadcast_to_v12i32_factor12:
 ; AVX512DQ:       # %bb.0:
-; AVX512DQ-NEXT:    vmovdqa (%rdi), %ymm0
-; AVX512DQ-NEXT:    vpaddb (%rsi), %ymm0, %ymm0
+; AVX512DQ-NEXT:    vmovdqa (%rdi), %xmm0
 ; AVX512DQ-NEXT:    vmovdqa 48(%rdi), %xmm1
 ; AVX512DQ-NEXT:    vpaddb 48(%rsi), %xmm1, %xmm1
-; AVX512DQ-NEXT:    vpbroadcastw %xmm0, %ymm2
-; AVX512DQ-NEXT:    vpblendw {{.*#+}} ymm1 = ymm2[0],ymm1[1],ymm2[2],ymm1[3],ymm2[4],ymm1[5],ymm2[6],ymm1[7],ymm2[8],ymm1[9],ymm2[10],ymm1[11],ymm2[12],ymm1[13],ymm2[14],ymm1[15]
+; AVX512DQ-NEXT:    vpaddb (%rsi), %xmm0, %xmm0
 ; AVX512DQ-NEXT:    vpbroadcastw %xmm0, %ymm0
+; AVX512DQ-NEXT:    vpblendw {{.*#+}} ymm1 = ymm0[0],ymm1[1],ymm0[2],ymm1[3],ymm0[4],ymm1[5],ymm0[6],ymm1[7],ymm0[8],ymm1[9],ymm0[10],ymm1[11],ymm0[12],ymm1[13],ymm0[14],ymm1[15]
 ; AVX512DQ-NEXT:    vpaddb (%rdx), %ymm1, %ymm1
 ; AVX512DQ-NEXT:    vpaddb 32(%rdx), %ymm0, %ymm0
 ; AVX512DQ-NEXT:    vmovdqa %ymm0, 32(%rcx)
@@ -3768,10 +3766,10 @@ define void @vec384_i16_widen_to_i64_factor4_broadcast_to_v6i64_factor6(ptr %in.
 ;
 ; AVX512F-LABEL: vec384_i16_widen_to_i64_factor4_broadcast_to_v6i64_factor6:
 ; AVX512F:       # %bb.0:
-; AVX512F-NEXT:    vmovdqa (%rdi), %ymm0
-; AVX512F-NEXT:    vpaddb (%rsi), %ymm0, %ymm0
+; AVX512F-NEXT:    vmovdqa (%rdi), %xmm0
 ; AVX512F-NEXT:    vmovdqa 48(%rdi), %xmm1
 ; AVX512F-NEXT:    vpaddb 48(%rsi), %xmm1, %xmm1
+; AVX512F-NEXT:    vpaddb (%rsi), %xmm0, %xmm0
 ; AVX512F-NEXT:    vpbroadcastq %xmm0, %ymm2
 ; AVX512F-NEXT:    vpblendw {{.*#+}} ymm1 = ymm2[0],ymm1[1,2,3],ymm2[4],ymm1[5,6,7],ymm2[8],ymm1[9,10,11],ymm2[12],ymm1[13,14,15]
 ; AVX512F-NEXT:    vpbroadcastw %xmm0, %ymm0
@@ -3784,10 +3782,10 @@ define void @vec384_i16_widen_to_i64_factor4_broadcast_to_v6i64_factor6(ptr %in.
 ;
 ; AVX512DQ-LABEL: vec384_i16_widen_to_i64_factor4_broadcast_to_v6i64_factor6:
 ; AVX512DQ:       # %bb.0:
-; AVX512DQ-NEXT:    vmovdqa (%rdi), %ymm0
-; AVX512DQ-NEXT:    vpaddb (%rsi), %ymm0, %ymm0
+; AVX512DQ-NEXT:    vmovdqa (%rdi), %xmm0
 ; AVX512DQ-NEXT:    vmovdqa 48(%rdi), %xmm1
 ; AVX512DQ-NEXT:    vpaddb 48(%rsi), %xmm1, %xmm1
+; AVX512DQ-NEXT:    vpaddb (%rsi), %xmm0, %xmm0
 ; AVX512DQ-NEXT:    vpbroadcastq %xmm0, %ymm2
 ; AVX512DQ-NEXT:    vpblendw {{.*#+}} ymm1 = ymm2[0],ymm1[1,2,3],ymm2[4],ymm1[5,6,7],ymm2[8],ymm1[9,10,11],ymm2[12],ymm1[13,14,15]
 ; AVX512DQ-NEXT:    vpbroadcastw %xmm0, %ymm0
@@ -4147,9 +4145,9 @@ define void @vec384_i16_widen_to_i192_factor12_broadcast_to_v2i192_factor2(ptr %
 ;
 ; AVX512F-LABEL: vec384_i16_widen_to_i192_factor12_broadcast_to_v2i192_factor2:
 ; AVX512F:       # %bb.0:
-; AVX512F-NEXT:    vmovdqa (%rdi), %ymm0
-; AVX512F-NEXT:    vpaddb (%rsi), %ymm0, %ymm0
+; AVX512F-NEXT:    vmovdqa (%rdi), %xmm0
 ; AVX512F-NEXT:    vmovdqa 48(%rdi), %xmm1
+; AVX512F-NEXT:    vpaddb (%rsi), %xmm0, %xmm0
 ; AVX512F-NEXT:    vpaddb 48(%rsi), %xmm1, %xmm1
 ; AVX512F-NEXT:    vpblendw {{.*#+}} xmm1 = xmm0[0],xmm1[1,2,3,4,5,6,7]
 ; AVX512F-NEXT:    vpbroadcastw %xmm0, %xmm0
@@ -4161,9 +4159,9 @@ define void @vec384_i16_widen_to_i192_factor12_broadcast_to_v2i192_factor2(ptr %
 ;
 ; AVX512DQ-LABEL: vec384_i16_widen_to_i192_factor12_broadcast_to_v2i192_factor2:
 ; AVX512DQ:       # %bb.0:
-; AVX512DQ-NEXT:    vmovdqa (%rdi), %ymm0
-; AVX512DQ-NEXT:    vpaddb (%rsi), %ymm0, %ymm0
+; AVX512DQ-NEXT:    vmovdqa (%rdi), %xmm0
 ; AVX512DQ-NEXT:    vmovdqa 48(%rdi), %xmm1
+; AVX512DQ-NEXT:    vpaddb (%rsi), %xmm0, %xmm0
 ; AVX512DQ-NEXT:    vpaddb 48(%rsi), %xmm1, %xmm1
 ; AVX512DQ-NEXT:    vpblendw {{.*#+}} xmm1 = xmm0[0],xmm1[1,2,3,4,5,6,7]
 ; AVX512DQ-NEXT:    vpbroadcastw %xmm0, %xmm0
diff --git a/llvm/test/CodeGen/X86/dpbusd.ll b/llvm/test/CodeGen/X86/dpbusd.ll
index fbea08eb1e5502..04d7a9691b645f 100644
--- a/llvm/test/CodeGen/X86/dpbusd.ll
+++ b/llvm/test/CodeGen/X86/dpbusd.ll
@@ -26,7 +26,7 @@ define i32 @no_dpbusd(ptr%a, ptr%b, i32 %c, i32 %n) {
 ; AVX512-NEXT:    vpmovzxbw {{.*#+}} ymm1 = mem[0],zero,mem[1],zero,mem[2],zero,mem[3],zero,mem[4],zero,mem[5],zero,mem[6],zero,mem[7],zero,mem[8],zero,mem[9],zero,mem[10],zero,mem[11],zero,mem[12],zero,mem[13],zero,mem[14],zero,mem[15],zero
 ; AVX512-NEXT:    vpmaddwd %ymm0, %ymm1, %ymm0
 ; AVX512-NEXT:    vextracti128 $1, %ymm0, %xmm1
-; AVX512-NEXT:    vpaddd %ymm1, %ymm0, %ymm0
+; AVX512-NEXT:    vpaddd %xmm1, %xmm0, %xmm0
 ; AVX512-NEXT:    vpshufd {{.*#+}} xmm1 = xmm0[2,3,2,3]
 ; AVX512-NEXT:    vpaddd %xmm1, %xmm0, %xmm0
 ; AVX512-NEXT:    vpshufd {{.*#+}} xmm1 = xmm0[1,1,1,1]
diff --git a/llvm/test/CodeGen/X86/dpbusd_i4.ll b/llvm/test/CodeGen/X86/dpbusd_i4.ll
index 906fead7f8db53..a212f99680ef4d 100644
--- a/llvm/test/CodeGen/X86/dpbusd_i4.ll
+++ b/llvm/test/CodeGen/X86/dpbusd_i4.ll
@@ -86,7 +86,7 @@ define i32 @mul_sext_i4i4(<16 x i4> %a, <16 x i4> %b, i32 %c) {
 ; CHECK-NEXT:    vpsraw $12, %ymm0, %ymm0
 ; CHECK-NEXT:    vpmaddwd %ymm1, %ymm0, %ymm0
 ; CHECK-NEXT:    vextracti128 $1, %ymm0, %xmm1
-; CHECK-NEXT:    vpaddd %ymm1, %ymm0, %ymm0
+; CHECK-NEXT:    vpaddd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    vpshufd {{.*#+}} xmm1 = xmm0[2,3,2,3]
 ; CHECK-NEXT:    vpaddd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    vpshufd {{.*#+}} xmm1 = xmm0[1,1,1,1]
diff --git a/llvm/test/CodeGen/X86/insertelement-var-index.ll b/llvm/test/CodeGen/X86/insertelement-var-index.ll
index 5420e6b5ce86f3..dd1c2d3719d7b0 100644
--- a/llvm/test/CodeGen/X86/insertelement-var-index.ll
+++ b/llvm/test/CodeGen/X86/insertelement-var-index.ll
@@ -2336,14 +2336,12 @@ define i32 @PR44139(ptr %p) {
 ;
 ; AVX512-LABEL: PR44139:
 ; AVX512:       # %bb.0:
-; AVX512-NEXT:    vmovdqa64 (%rdi), %zmm0
-; AVX512-NEXT:    vpbroadcastq (%rdi), %zmm1
-; AVX512-NEXT:    vpmovqd %zmm0, %ymm0
-; AVX512-NEXT:    vpinsrq $1, (%rdi), %xmm1, %xmm2
-; AVX512-NEXT:    vinserti32x4 $0, %xmm2, %zmm1, %zmm2
-; AVX512-NEXT:    vmovdqa64 %zmm1, 64(%rdi)
-; AVX512-NEXT:    vmovdqa64 %zmm2, (%rdi)
-; AVX512-NEXT:    vmovd %xmm0, %eax
+; AVX512-NEXT:    vpbroadcastq (%rdi), %zmm0
+; AVX512-NEXT:    vpinsrq $1, (%rdi), %xmm0, %xmm1
+; AVX512-NEXT:    vinserti32x4 $0, %xmm1, %zmm0, %zmm1
+; AVX512-NEXT:    vmovdqa64 %zmm0, 64(%rdi)
+; AVX512-NEXT:    movl (%rdi), %eax
+; AVX512-NEXT:    vmovdqa64 %zmm1, (%rdi)
 ; AVX512-NEXT:    leal 2147483647(%rax), %ecx
 ; AVX512-NEXT:    testl %eax, %eax
 ; AVX512-NEXT:    cmovnsl %eax, %ecx
diff --git a/llvm/test/CodeGen/X86/vector-interleaved-load-i16-stride-3.ll b/llvm/test/CodeGen/X86/vector-interleaved-load-i16-stride-3.ll
index 1436922f9dd114..6d5fc9ed0ab5b6 100644
--- a/llvm/test/CodeGen/X86/vector-interleaved-load-i16-stride-3.ll
+++ b/llvm/test/CodeGen/X86/vector-interleaved-load-i16-stride-3.ll
@@ -1828,22 +1828,22 @@ define void @load_i16_stride3_vf32(ptr %in.vec, ptr %out.vec0, ptr %out.vec1, pt
 ;
 ; AVX512-LABEL: load_i16_stride3_vf32:
 ; AVX512:       # %bb.0:
-; AVX512-NEXT:    vmovdqa {{.*#+}} ymm1 = [65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535]
+; AVX512-NEXT:    vmovdqa {{.*#+}} ymm0 = [65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535]
 ; AVX512-NEXT:    vmovdqa 128(%rdi), %ymm5
 ; AVX512-NEXT:    vmovdqa 160(%rdi), %ymm6
-; AVX512-NEXT:    vmovdqa %ymm1, %ymm0
-; AVX512-NEXT:    vpternlogq $202, %ymm5, %ymm6, %ymm0
-; AVX512-NEXT:    vpermq {{.*#+}} ymm2 = ymm0[2,3,0,1]
-; AVX512-NEXT:    vpblendw {{.*#+}} ymm0 = ymm0[0],ymm2[1],ymm0[2,3],ymm2[4],ymm0[5,6],ymm2[7],ymm0[8],ymm2[9],ymm0[10,11],ymm2[12],ymm0[13,14],ymm2[15]
-; AVX512-NEXT:    vpshufb {{.*#+}} ymm3 = ymm0[u,u,u,u,u,u,u,u,u,u,u,u,4,5,10,11,16,17,22,23,28,29,18,19,24,25,30,31,20,21,26,27]
-; AVX512-NEXT:    vmovdqa 112(%rdi), %xmm0
+; AVX512-NEXT:    vmovdqa %ymm0, %ymm1
+; AVX512-NEXT:    vpternlogq $202, %ymm5, %ymm6, %ymm1
+; AVX512-NEXT:    vpermq {{.*#+}} ymm2 = ymm1[2,3,0,1]
+; AVX512-NEXT:    vpblendw {{.*#+}} ymm1 = ymm1[0],ymm2[1],ymm1[2,3],ymm2[4],ymm1[5,6],ymm2[7],ymm1[8],ymm2[9],ymm1[10,11],ymm2[12],ymm1[13,14],ymm2[15]
+; AVX512-NEXT:    vpshufb {{.*#+}} ymm3 = ymm1[u,u,u,u,u,u,u,u,u,u,u,u,4,5,10,11,16,17,22,23,28,29,18,19,24,25,30,31,20,21,26,27]
+; AVX512-NEXT:    vmovdqa 112(%rdi), %xmm1
 ; AVX512-NEXT:    vmovdqa 96(%rdi), %xmm2
-; AVX512-NEXT:    vpblendw {{.*#+}} xmm4 = xmm2[0],xmm0[1],xmm2[2,3],xmm0[4],xmm2[5,6],xmm0[7]
+; AVX512-NEXT:    vpblendw {{.*#+}} xmm4 = xmm2[0],xmm1[1],xmm2[2,3],xmm1[4],xmm2[5,6],xmm1[7]
 ; AVX512-NEXT:    vpshufb {{.*#+}} xmm4 = xmm4[0,1,6,7,12,13,2,3,8,9,14,15,u,u,u,u]
 ; AVX512-NEXT:    vpblendd {{.*#+}} ymm7 = ymm4[0,1,2],ymm3[3,4,5,6,7]
 ; AVX512-NEXT:    vmovdqa (%rdi), %ymm8
 ; AVX512-NEXT:    vmovdqa 32(%rdi), %ymm9
-; AVX512-NEXT:    vmovdqa %ymm1, %ymm3
+; AVX512-NEXT:    vmovdqa %ymm0, %ymm3
 ; AVX512-NEXT:    vpternlogq $202, %ymm9, %ymm8, %ymm3
 ; AVX512-NEXT:    vpermq {{.*#+}} ymm4 = ymm3[2,3,0,1]
 ; AVX512-NEXT:    vpblendw {{.*#+}} ymm3 = ymm3[0],ymm4[1],ymm3[2,3],ymm4[4],ymm3[5,6],ymm4[7],ymm3[8],ymm4[9],ymm3[10,11],ymm4[12],ymm3[13,14],ymm4[15]
@@ -1857,14 +1857,14 @@ define void @load_i16_stride3_vf32(ptr %in.vec, ptr %out.vec0, ptr %out.vec1, pt
 ; AVX512-NEXT:    vpshufhw {{.*#+}} xmm10 = xmm10[0,1,2,3,6,5,4,7]
 ; AVX512-NEXT:    vpblendd {{.*#+}} ymm10 = ymm10[0,1,2,3],ymm11[4,5,6,7]
 ; AVX512-NEXT:    vinserti64x4 $1, %ymm7, %zmm10, %zmm7
-; AVX512-NEXT:    vmovdqa %ymm1, %ymm10
+; AVX512-NEXT:    vmovdqa %ymm0, %ymm10
 ; AVX512-NEXT:    vpternlogq $202, %ymm6, %ymm5, %ymm10
 ; AVX512-NEXT:    vpermq {{.*#+}} ymm11 = ymm10[2,3,0,1]
 ; AVX512-NEXT:    vpblendw {{.*#+}} ymm10 = ymm10[0,1],ymm11[2],ymm10[3,4],ymm11[5],ymm10[6,7,8,9],ymm11[10],ymm10[11,12],ymm11[13],ymm10[14,15]
 ; AVX512-NEXT:    vmovdqa {{.*#+}} ymm11 = [2,3,8,9,14,15,4,5,10,11,0,1,6,7,12,13,18,19,24,25,30,31,20,21,26,27,16,17,22,23,28,29]
 ; AVX512-NEXT:    vpshufb %ymm11, %ymm10, %ymm10
-; AVX512-NEXT:    vpblendw {{.*#+}} xmm12 = xmm2[0,1],xmm0[2],xmm2[3,4],xmm0[5],xmm2[6,7]
-; AVX512-NEXT:    vpshufb %xmm11, %xmm12, %xmm12
+; AVX512-NEXT:    vpblendw {{.*#+}} xmm12 = xmm2[0,1],xmm1[2],xmm2[3,4],xmm1[5],xmm2[6,7]
+; AVX512-NEXT:    vpshufb {{.*#+}} xmm12 = xmm12[2,3,8,9,14,15,4,5,10,11,10,11,10,11,10,11]
 ; AVX512-NEXT:    vpblendw {{.*#+}} xmm12 = xmm12[0,1,2,3,4],xmm10[5,6,7]
 ; AVX512-NEXT:    vpblendd {{.*#+}} ymm10 = ymm12[0,1,2,3],ymm10[4,5,6,7]
 ; AVX512-NEXT:    vmovdqa {{.*#+}} ymm12 = [65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535,65535]
@@ -1885,21 +1885,19 @@ define void @load_i16_stride3_vf32(ptr %in.vec, ptr %out.vec0, ptr %out.vec1, pt
 ; AVX512-NEXT:    vpblendw {{.*#+}} ymm5 = ymm5[0],ymm12[1,2],ymm5[3],ymm12[4,5],ymm5[6],ymm12[7],ymm5[8],ymm12[9,10],ymm5[11],ymm12[12,13],ymm5[14],ymm12[15]
 ; AVX512-NEXT:    vmovdqa {{.*#+}} ymm6 = [4,5,10,11,0,1,6,7,12,13,2,3,8,9,14,15,20,21,26,27,16,17,22,23,28,29,18,19,24,25,30,31]
 ; AVX512-NEXT:    vpshufb %ymm6, %ymm5, %ymm5
-; AVX512-NEXT:    vpternlogq $202, %ymm8, %ymm9, %ymm1
-; AVX512-NEXT:    vpermq {{.*#+}} ymm8 = ymm1[2,3,0,1]
-; AVX512-NEXT:    vpblendw {{.*#+}} ymm1 = ymm8[0],ymm1[1,2],ymm8[3],ymm1[4,5],ymm8[6],ymm1[7],ymm8[8],ymm1[9,10],ymm8[11],ymm1[12,13],ymm8[14],ymm1[15]
-; AVX512-NEXT:    vpshufb %ymm6, %ymm1, %ymm1
-; AVX512-NEXT:    vpblendw {{.*#+}} xmm3 = xmm4[0],xmm3[1],xmm4[2,3],xmm3[4],xmm4[5,6],xmm3[7]
-; AVX512-NEXT:    vpshufb %xmm6, %xmm3, %xmm3
-; AVX512-NEXT:    vinserti128 $1, %xmm3, %ymm0, %ymm3
-; AVX512-NEXT:    vpblendd {{.*#+}} ymm1 = ymm1[0,1,2,3,4],ymm3[5,6,7]
-; AVX512-NEXT:    vpblendw {{.*#+}} xmm0 = xmm0[0,1],xmm2[2],xmm0[3,4],xmm2[5],xmm0[6,7]
-; AVX512-NEXT:    vpshufb {{.*#+}} xmm0 = xmm0[4,5,10,11,0,1,6,7,12,13,14,15,0,1,2,3]
-; AVX512-NEXT:    vinserti64x4 $1, %ymm0, %zmm1, %zmm0
-; AVX512-NEXT:    vextracti32x4 $2, %zmm0, %xmm0
-; AVX512-NEXT:    vpblendw {{.*#+}} xmm0 = xmm0[0,1,2,3,4],xmm5[5,6,7]
-; AVX512-NEXT:    vpblendd {{.*#+}} ymm0 = ymm0[0,1,2,3],ymm5[4,5,6,7]
-; AVX512-NEXT:    vinserti64x4 $1, %ymm0, %zmm1, %zmm0
+; AVX512-NEXT:    vpblendw {{.*#+}} xmm1 = xmm1[0,1],xmm2[2],xmm1[3,4],xmm2[5],xmm1[6,7]
+; AVX512-NEXT:    vpshufb {{.*#+}} xmm1 = xmm1[4,5,10,11,0,1,6,7,12,13,14,15,0,1,2,3]
+; AVX512-NEXT:    vpblendw {{.*#+}} xmm1 = xmm1[0,1,2,3,4],xmm5[5,6,7]
+; AVX512-NEXT:    vpblendd {{.*#+}} ymm1 = ymm1[0,1,2,3],ymm5[4,5,6,7]
+; AVX512-NEXT:    vpternlogq $202, %ymm8, %ymm9, %ymm0
+; AVX512-NEXT:    vpermq {{.*#+}} ymm2 = ymm0[2,3,0,1]
+; AVX512-NEXT:    vpblendw {{.*#+}} ymm0 = ymm2[0],ymm0[1,2],ymm2[3],ymm0[4,5],ymm2[6],ymm0[7],ymm2[8],ymm0[9,10],ymm2[11],ymm0[12,13],ymm2[14],ymm0[15]
+; AVX512-NEXT:    vpshufb %ymm6, %ymm0, %ymm0
+; AVX512-NEXT:    vpblendw {{.*#+}} xmm2 = xmm4[0],xmm3[1],xmm4[2,3],xmm3[4],xmm4[5,6],xmm3[7]
+; AVX512-NEXT:    vpshufb %xmm6, %xmm2, %xmm2
+; AVX512-NEXT:    vinserti128 $1, %xmm2, %ymm0, %ymm2
+; AVX512-NEXT:    vpblendd {{.*#+}} ymm0 = ymm0[0,1,2,3,4],ymm2[5,6,7]
+; AVX512-NEXT:    vinserti64x4 $1, %ymm1, %zmm0, %zmm0
 ; AVX512-NEXT:    vmovdqa64 %zmm7, (%rsi)
 ; AVX512-NEXT:    vmovdqa64 %zmm10, (%rdx)
 ; AVX512-NEXT:    vmovdqa64 %zmm0, (%rcx)
@@ -1908,22 +1906,22 @@ define void @load_i16_stride3_vf32(ptr %in.vec, ptr %out.vec0, ptr %out.vec1, pt
 ;
 ; AVX512-FCP-LABEL: load_i16_stride3_vf32:
 ; AVX512-FCP:       # %bb.0:
-; AVX512-FCP-NEXT:    vmovdqa {{.*#+}} ymm1 = [65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535]
+; AVX512-FCP-NEXT:    vmovdqa {{.*#+}} ymm0 = [65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535,65535,0,65535]
 ; AVX512-FCP-NEXT:    vmovdqa 128(%rdi), %ymm5
 ; AVX512-FCP-NEXT:    vmovdqa 160(%rdi), %ymm6
-; AVX512-FCP-NEXT:    vmovdqa %ymm1, %ymm0
-; AVX512-FCP-NEXT:    vpternlogq $202, %ymm5, %ymm6, %ymm0
-; AVX512-FCP-NEXT:    vpermq {{.*#+}} ymm2 = ymm0[2,3,0,1]
-; AVX512-FCP-NEXT:    vpblendw {{.*#+}} ymm0 = ymm0[0],ymm2[1],ymm0[2,3],ymm2[4],ymm0[5,6],ymm2[7],ymm0[8],ymm2[9],ymm0[10,11],ymm2[12],ymm0[13,14],ymm2[15]
-; AVX512-FCP-NEXT:    vpshufb {{.*#+}} ymm3 = ymm0[u,u,u,u,u,u,u,u,u,u,u,u,4,5,10,11,16,17,22,23,28,29,18,19,24,25,30,31,20,21,26,27]
-; AVX512-FCP-NEXT:    vmovdqa 112(%rdi), %xmm0
+; AVX512-FCP-NEXT:    vmovdqa %ymm0, %ymm1
+; AVX512-FCP-NEXT:    vpternlogq $202, %ymm5, %ymm6, %ymm1
+; AVX512-FCP-NEXT:    vpermq {{.*#+}} ymm2 = ymm1[2,3,0,1]
+; AVX512-FCP-NEXT:    vpblendw {{.*#+}} ymm1 = ymm1[0],ymm2[1],ymm1[2,3],ymm2[4],ymm1[5,6],ymm2[7],ymm1[8],ymm2[9],ymm1[10,11],ymm2[12],ymm1[13,14],ymm2[15]
+; AVX512-FCP-NEXT:    vpshufb {{.*#+}} ymm3 = ymm1[u,u,u,u,u,u,u,u,u,u,u,u,4,5,10,11,16,17,22,23,28,29,18,19,24,25,30,31,20,21,26,27]
+; AVX512-FCP-NEXT:    vmovdqa 112(%rdi), %xmm1
 ; AVX512-FCP-NEXT:    vmovdqa 96(%rdi), %xmm2
-; AVX512-FCP-NEXT:    vpblendw {{.*#+}} xmm4 = xmm2[0],xmm0[1],xmm2[2,3],xmm0[4],xmm2[5,6],xmm0[7]
+; AVX512-FCP-NEXT:    vpblendw {{.*#+}} xmm4 = xmm2[0],xmm1[1],xmm2[2,3],xmm1[4],xmm2[5,6],xmm1[7]
 ; AVX512-FCP-NEXT:    vpshufb {{.*#+}} xmm4 = xmm4[0,1,6,7,12,13,2,3,8,9,14,15,u,u,u,u]
 ; AVX512-FCP-NEXT:    vpblendd {{.*#+}} ymm7 = ymm4[0,1,2],ymm3[3,4,5,6,7]
 ; AVX512-FCP-NEXT:    vmovdqa (%rdi), %ymm8
 ; AVX512-FCP-NEXT:    vmovdqa 32(%rdi), %ymm9
-; AVX512-FCP-NEXT:    vmovdqa %ymm1, %ymm3
+; AVX512-FCP-NEXT:    vmovdqa %ymm0, %ymm3
 ; AVX512-FCP-NEXT:    vpternlogq $202, %ymm9, %ymm8, %ymm3
 ; AVX512-FCP-NEXT:    vpermq {{.*#+}} ymm4 = ymm3[2,3,0,1]
 ; AVX512-FCP-NEXT:    vpblendw {{.*#+}} ymm3 = ymm3[0],ymm4[1],ymm3[2,3],ymm4[4],ymm3[5,6],ymm4[7],ymm3[8],ymm4[9],ymm3[10,11],ymm4[12],ymm3[13,14],ymm4[15]
@@ -1...
[truncated]

phoebewang · 2024-04-08T01:08:13Z

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -24459,6 +24459,23 @@ SDValue DAGCombiner::visitEXTRACT_SUBVECTOR(SDNode *N) {
      if (!LegalOperations || TLI.isOperationLegal(ISD::SPLAT_VECTOR, NVT))
        return DAG.getSplatVector(NVT, SDLoc(N), V.getOperand(0));

+  // extract_subvector(insert_subvector(x,y,c1),c2)
+  //  --> extract_subvector(y,c2-c1)


The c1, c2 are indices based on type of y and NVT, we cannot sub them directly given they have difference scale.
For example, if we insert v16i8 to v32i8 at index 1, then extra v8i8 at index 2.

| v16i8(y)| v16i8 | |v8i8| Ext|v8i8|v8i8|

The new index is c2 - c1 * (NumInsElts/NumSubElts) = 0 instead of c2 - c1 = 1.

Aren't you confusing the AVX subvector instructions (which use subvector offset indices) with the DAG subvector nodes (which use element offset indices)? See getInsertVINSERTImmediate

Thanks! I misunderstood it.

…_subvector(y,c2-c1) If the extract_subvector is cheap, attempt to extract directly from an inserted subvector

RKSimon · 2024-04-12T09:20:08Z

ping?

phoebewang

LGTM.

phoebewang · 2024-04-12T09:42:56Z

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -24459,6 +24459,23 @@ SDValue DAGCombiner::visitEXTRACT_SUBVECTOR(SDNode *N) {
      if (!LegalOperations || TLI.isOperationLegal(ISD::SPLAT_VECTOR, NVT))
        return DAG.getSplatVector(NVT, SDLoc(N), V.getOperand(0));

+  // extract_subvector(insert_subvector(x,y,c1),c2)
+  //  --> extract_subvector(y,c2-c1)


Thanks! I misunderstood it.

steven-johnson · 2024-04-15T21:07:49Z

Echoing a comment from a specific commit:

Just a heads up, looks like this broke Halide SVE2 tests here: https://github.com/halide/Halide/blob/main/test/correctness/simd_op_check_sve2.cpp#L585.

Assertion triggered:

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:7061 in SDValue llvm::SelectionDAG::getNode(unsigned int, const SDLoc &, EVT, SDValue, SDValue, const SDNodeFlags): (VT.isFixedLengthVector() || N1VT.isScalableVector()) && "Cannot extract a scalable vector from a fixed length vector!"

I'm investigating now to see if this is a bug on the Halide side or the LLVM side, will update here as I get more info.

steven-johnson · 2024-04-15T21:44:57Z

I think this is a subtle bug in the changed code here -- I think the code above doesn't consider the possibility of scalable / fixed vector combinations, and Halide's tests (which tend to exercise a lot of corner cases in LLVM vector support) are breaking this. I'd like to request this get rolled back (to keep Halide unbroken) until we can work out exactly why this is breaking in this fashion, and hopefully re-land it after doing testing with Halide.

TL;DR: this needs to be rolled back.

steven-johnson · 2024-04-15T21:55:35Z

Enclosed is an IR file that will replicate the crash when run through llc.
test_op_frecpe_float32_x8_0.zip

… extract_subvector(y,c2-c1) (#87925)" This reverts commit 8c0f52e. Reverting to green, reproducer attached in the PR/revision comments.

…_subvector(y,c2-c1) (#87925) (REAPPLIED) If the extract_subvector is cheap, attempt to extract directly from an inserted subvector Reapplied with a check to ensure we only attempt this for fixed vectors

antmox · 2024-04-18T09:18:20Z

Hello @RKSimon,

It looks like this patch broke clang-aarch64-sve-vls bot :
https://lab.llvm.org/buildbot/#/builders/184/builds/11650

The bot is still broken with the latest commit :
https://lab.llvm.org/buildbot/#/builders/184/builds/11655

The compilation of the following testsuite source files seems to be stuck:

MultiSource/Applications/sgefa/driver.c
MultiSource/Applications/hbd/d9-swtch.cpp
MultiSource/Benchmarks/ASC_Sequoia/AMGmk/csr_matvec.c
MultiSource/Benchmarks/Prolangs-C/football/common.c
MultiSource/Benchmarks/MallocBench/gs/gdevmem.c
MultiSource/Benchmarks/nbench/nbench1.c
MultiSource/Benchmarks/Prolangs-C/TimberWolfMC/makesite.c
MultiSource/Benchmarks/tramp3d-v4/tramp3d-v4.cpp
MultiSource/Benchmarks/DOE-ProxyApps-C/SimpleMOC/tracks.c
SingleSource/Benchmarks/Adobe-C++/simple_types_loop_invariant.cpp
MultiSource/Benchmarks/mafft/Halignmm.c
MultiSource/Benchmarks/mafft/partQalignmm.c
MultiSource/Benchmarks/mafft/partSalignmm.c
MultiSource/Benchmarks/mafft/Qalignmm.c
MultiSource/Benchmarks/mafft/Ralignmm.c
MultiSource/Benchmarks/mafft/Salignmm.c

Could you please look at this ?

RKSimon · 2024-04-18T11:15:40Z

Thanks @antmox - got a repro now

@antmox

…ct_subvector(y,c2-c1) is working on fixed vector types #87925 failed to ensure we weren't removing the extracted subvector from a scalable vector type Thanks to @antmox for the headsup.

RKSimon requested review from arsenm, phoebewang and topperc April 7, 2024 13:43

llvmbot added backend:X86 llvm:SelectionDAG SelectionDAGISel as well labels Apr 7, 2024

RKSimon force-pushed the subvector_extract_from_insert branch from 24518e6 to eba5967 Compare April 7, 2024 13:59

phoebewang reviewed Apr 8, 2024

View reviewed changes

[DAG] Fold extract_subvector(insert_subvector(x,y,c1),c2) --> extract…

c3ddda9

…_subvector(y,c2-c1) If the extract_subvector is cheap, attempt to extract directly from an inserted subvector

RKSimon force-pushed the subvector_extract_from_insert branch from eba5967 to c3ddda9 Compare April 11, 2024 09:28

phoebewang approved these changes Apr 12, 2024

View reviewed changes

RKSimon merged commit 8c0f52e into llvm:main Apr 12, 2024
4 checks passed

alinas added a commit that referenced this pull request Apr 16, 2024

Revert "[DAG] Fold extract_subvector(insert_subvector(x,y,c1),c2) -->…

40bbdb6

… extract_subvector(y,c2-c1) (#87925)" This reverts commit 8c0f52e. Reverting to green, reproducer attached in the PR/revision comments.

RKSimon deleted the subvector_extract_from_insert branch April 16, 2024 16:05

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[DAG] Fold extract_subvector(insert_subvector(x,y,c1),c2) --> extract_subvector(y,c2-c1) #87925

[DAG] Fold extract_subvector(insert_subvector(x,y,c1),c2) --> extract_subvector(y,c2-c1) #87925

RKSimon commented Apr 7, 2024

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steven-johnson commented Apr 15, 2024

antmox commented Apr 18, 2024

RKSimon commented Apr 18, 2024

[DAG] Fold extract_subvector(insert_subvector(x,y,c1),c2) --> extract_subvector(y,c2-c1) #87925

[DAG] Fold extract_subvector(insert_subvector(x,y,c1),c2) --> extract_subvector(y,c2-c1) #87925

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