[X86][AVX512] Add patterns for all variants of VMOVSS/VMOVSD instructions.

Differential Revision: https://reviews.llvm.org/D26022

llvm-svn: 286758

diff --git a/llvm/lib/Target/X86/X86InstrAVX512.td b/llvm/lib/Target/X86/X86InstrAVX512.td
index 671bfaa..f793c26 100644 (file)
--- a/llvm/lib/Target/X86/X86InstrAVX512.td
+++ b/llvm/lib/Target/X86/X86InstrAVX512.td
@@ -3311,6 +3311,93 @@ defm VMOVSSZ : avx512_move_scalar<"vmovss", X86Movss, f32x_info>,
 defm VMOVSDZ : avx512_move_scalar<"vmovsd", X86Movsd, f64x_info>,
                                   VEX_LIG, XD, VEX_W, EVEX_CD8<64, CD8VT1>;
 
+
+multiclass avx512_move_scalar_lowering<string InstrStr, SDNode OpNode,
+                                       PatLeaf ZeroFP, X86VectorVTInfo _> {
+
+def : Pat<(_.VT (OpNode _.RC:$src0,
+                        (_.VT (scalar_to_vector 
+                                  (_.EltVT (X86selects (i1 (trunc GR32:$mask)),
+                                                       (_.EltVT _.FRC:$src1),
+                                                       (_.EltVT _.FRC:$src2))))))),
+          (COPY_TO_REGCLASS (!cast<Instruction>(InstrStr#rrk) 
+                                          (COPY_TO_REGCLASS _.FRC:$src2, _.RC),
+                                          (COPY_TO_REGCLASS GR32:$mask, VK1WM),
+                                          (_.VT _.RC:$src0),
+                                          (COPY_TO_REGCLASS _.FRC:$src1, _.RC)),
+                            _.RC)>;
+
+def : Pat<(_.VT (OpNode _.RC:$src0,
+                        (_.VT (scalar_to_vector 
+                                  (_.EltVT (X86selects (i1 (trunc GR32:$mask)),
+                                                       (_.EltVT _.FRC:$src1),
+                                                       (_.EltVT ZeroFP))))))),
+          (COPY_TO_REGCLASS (!cast<Instruction>(InstrStr#rrkz) 
+                                          (COPY_TO_REGCLASS GR32:$mask, VK1WM),
+                                          (_.VT _.RC:$src0),
+                                          (COPY_TO_REGCLASS _.FRC:$src1, _.RC)),
+                            _.RC)>;
+
+}
+
+multiclass avx512_store_scalar_lowering<string InstrStr, AVX512VLVectorVTInfo _,
+                                        dag Mask, RegisterClass MaskRC> {
+
+def : Pat<(masked_store addr:$dst, Mask,
+             (_.info512.VT (insert_subvector undef, 
+                               (_.info256.VT (insert_subvector undef,
+                                                 (_.info128.VT _.info128.RC:$src),
+                                                 (i64 0))),
+                               (i64 0)))),
+          (!cast<Instruction>(InstrStr#mrk) addr:$dst, 
+                      (i1 (COPY_TO_REGCLASS MaskRC:$mask, VK1WM)),
+                      (COPY_TO_REGCLASS _.info128.RC:$src, _.info128.FRC))>; 
+
+}
+
+multiclass avx512_load_scalar_lowering<string InstrStr, AVX512VLVectorVTInfo _,
+                                       dag Mask, RegisterClass MaskRC> {
+
+def : Pat<(_.info128.VT (extract_subvector
+                         (_.info512.VT (masked_load addr:$srcAddr, Mask,
+                                        (_.info512.VT (bitconvert 
+                                                       (v16i32 immAllZerosV))))),
+                           (i64 0))),
+          (!cast<Instruction>(InstrStr#rmkz) 
+                      (i1 (COPY_TO_REGCLASS MaskRC:$mask, VK1WM)),
+                      addr:$srcAddr)>;
+
+def : Pat<(_.info128.VT (extract_subvector
+                (_.info512.VT (masked_load addr:$srcAddr, Mask,
+                      (_.info512.VT (insert_subvector undef,
+                            (_.info256.VT (insert_subvector undef,
+                                  (_.info128.VT (X86vzmovl _.info128.RC:$src)),
+                                  (i64 0))),
+                            (i64 0))))),
+                (i64 0))),
+          (!cast<Instruction>(InstrStr#rmk) _.info128.RC:$src,
+                      (i1 (COPY_TO_REGCLASS MaskRC:$mask, VK1WM)),
+                      addr:$srcAddr)>;
+
+}
+
+defm : avx512_move_scalar_lowering<"VMOVSSZ", X86Movss, fp32imm0, v4f32x_info>;
+defm : avx512_move_scalar_lowering<"VMOVSDZ", X86Movsd, fp64imm0, v2f64x_info>;
+
+defm : avx512_store_scalar_lowering<"VMOVSSZ", avx512vl_f32_info,
+                   (v16i1 (bitconvert (i16 (trunc (and GR32:$mask, (i32 1)))))), GR32>;
+defm : avx512_store_scalar_lowering<"VMOVSSZ", avx512vl_f32_info,
+                   (v16i1 (bitconvert (i16 (and GR16:$mask, (i16 1))))), GR16>;
+defm : avx512_store_scalar_lowering<"VMOVSDZ", avx512vl_f64_info,
+                   (v8i1 (bitconvert (i8 (and GR8:$mask, (i8 1))))), GR8>;
+
+defm : avx512_load_scalar_lowering<"VMOVSSZ", avx512vl_f32_info,
+                   (v16i1 (bitconvert (i16 (trunc (and GR32:$mask, (i32 1)))))), GR32>;
+defm : avx512_load_scalar_lowering<"VMOVSSZ", avx512vl_f32_info,
+                   (v16i1 (bitconvert (i16 (and GR16:$mask, (i16 1))))), GR16>;
+defm : avx512_load_scalar_lowering<"VMOVSDZ", avx512vl_f64_info,
+                   (v8i1 (bitconvert (i8 (and GR8:$mask, (i8 1))))), GR8>;
+
 def : Pat<(f32 (X86selects VK1WM:$mask, (f32 FR32X:$src1), (f32 FR32X:$src2))),
           (COPY_TO_REGCLASS (VMOVSSZrrk (COPY_TO_REGCLASS FR32X:$src2, VR128X),
            VK1WM:$mask, (v4f32 (IMPLICIT_DEF)),(COPY_TO_REGCLASS FR32X:$src1, VR128X)), FR32X)>;

diff --git a/llvm/lib/Target/X86/X86InstrFragmentsSIMD.td b/llvm/lib/Target/X86/X86InstrFragmentsSIMD.td
index 0b834fa..0670bee 100644 (file)
--- a/llvm/lib/Target/X86/X86InstrFragmentsSIMD.td
+++ b/llvm/lib/Target/X86/X86InstrFragmentsSIMD.td
@@ -858,6 +858,10 @@ def fp32imm0 : PatLeaf<(f32 fpimm), [{
   return N->isExactlyValue(+0.0);
 }]>;
 
+def fp64imm0 : PatLeaf<(f64 fpimm), [{
+  return N->isExactlyValue(+0.0);
+}]>;
+
 def I8Imm : SDNodeXForm<imm, [{
   // Transformation function: get the low 8 bits.
   return getI8Imm((uint8_t)N->getZExtValue(), SDLoc(N));

diff --git a/llvm/test/CodeGen/X86/avx512-intrinsics.ll b/llvm/test/CodeGen/X86/avx512-intrinsics.ll
index 0a78798..6cec4d2 100644 (file)
--- a/llvm/test/CodeGen/X86/avx512-intrinsics.ll
+++ b/llvm/test/CodeGen/X86/avx512-intrinsics.ll
@@ -4457,72 +4457,6 @@ define i32 @test_x86_avx512_ucomi_ss_lt(<4 x float> %a0, <4 x float> %a1) {
 }
 
 declare i32 @llvm.x86.avx512.vcomi.ss(<4 x float>, <4 x float>, i32, i32)
-declare <4 x float> @llvm.x86.avx512.mask.move.ss(<4 x float>, <4 x float>, <4 x float>, i8)
-
-define <4 x float>@test_int_x86_avx512_mask_move_ss_rrk(<4 x float> %x0, <4 x float> %x1, <4 x float> %x2, i8 %x3) {
-; CHECK-LABEL: test_int_x86_avx512_mask_move_ss_rrk:
-; CHECK:       ## BB#0:
-; CHECK-NEXT:    andl $1, %edi
-; CHECK-NEXT:    kmovw %edi, %k1
-; CHECK-NEXT:    vmovss %xmm1, %xmm0, %xmm2 {%k1}
-; CHECK-NEXT:    vmovaps %xmm2, %xmm0
-; CHECK-NEXT:    retq
-  %res = call <4 x float> @llvm.x86.avx512.mask.move.ss(<4 x float> %x0, <4 x float> %x1, <4 x float> %x2, i8 %x3)
-  ret <4 x float> %res
-}
-
-define <4 x float>@test_int_x86_avx512_mask_move_ss_rrkz(<4 x float> %x0, <4 x float> %x1, i8 %x2) {
-; CHECK-LABEL: test_int_x86_avx512_mask_move_ss_rrkz:
-; CHECK:       ## BB#0:
-; CHECK-NEXT:    andl $1, %edi
-; CHECK-NEXT:    kmovw %edi, %k1
-; CHECK-NEXT:    vmovss %xmm1, %xmm0, %xmm0 {%k1} {z}
-; CHECK-NEXT:    retq
-  %res = call <4 x float> @llvm.x86.avx512.mask.move.ss(<4 x float> %x0, <4 x float> %x1, <4 x float> zeroinitializer, i8 %x2)
-  ret <4 x float> %res
-}
-
-define <4 x float>@test_int_x86_avx512_mask_move_ss_rr(<4 x float> %x0, <4 x float> %x1, i8 %x2) {
-; CHECK-LABEL: test_int_x86_avx512_mask_move_ss_rr:
-; CHECK:       ## BB#0:
-; CHECK-NEXT:    vmovss {{.*#+}} xmm0 = xmm1[0],xmm0[1,2,3]
-; CHECK-NEXT:    retq
-  %res = call <4 x float> @llvm.x86.avx512.mask.move.ss(<4 x float> %x0, <4 x float> %x1, <4 x float> zeroinitializer, i8 -1)
-  ret <4 x float> %res
-}
-
-declare <2 x double> @llvm.x86.avx512.mask.move.sd(<2 x double>, <2 x double>, <2 x double>, i8)
-define <2 x double>@test_int_x86_avx512_mask_move_sd_rr(<2 x double> %x0, <2 x double> %x1, i8 %x2) {
-; CHECK-LABEL: test_int_x86_avx512_mask_move_sd_rr:
-; CHECK:       ## BB#0:
-; CHECK-NEXT:    vmovsd {{.*#+}} xmm0 = xmm1[0],xmm0[1]
-; CHECK-NEXT:    retq
-  %res = call <2 x double> @llvm.x86.avx512.mask.move.sd(<2 x double> %x0, <2 x double> %x1, <2 x double> zeroinitializer, i8 -1)
-  ret <2 x double> %res
-}
-
-define <2 x double>@test_int_x86_avx512_mask_move_sd_rrkz(<2 x double> %x0, <2 x double> %x1, i8 %x2) {
-; CHECK-LABEL: test_int_x86_avx512_mask_move_sd_rrkz:
-; CHECK:       ## BB#0:
-; CHECK-NEXT:    andl $1, %edi
-; CHECK-NEXT:    kmovw %edi, %k1
-; CHECK-NEXT:    vmovsd %xmm1, %xmm0, %xmm0 {%k1} {z}
-; CHECK-NEXT:    retq
-  %res = call <2 x double> @llvm.x86.avx512.mask.move.sd(<2 x double> %x0, <2 x double> %x1, <2 x double> zeroinitializer, i8 %x2)
-  ret <2 x double> %res
-}
-
-define <2 x double>@test_int_x86_avx512_mask_move_sd_rrk(<2 x double> %x0, <2 x double> %x1, <2 x double> %x2, i8 %x3) {
-; CHECK-LABEL: test_int_x86_avx512_mask_move_sd_rrk:
-; CHECK:       ## BB#0:
-; CHECK-NEXT:    andl $1, %edi
-; CHECK-NEXT:    kmovw %edi, %k1
-; CHECK-NEXT:    vmovsd %xmm1, %xmm0, %xmm2 {%k1}
-; CHECK-NEXT:    vmovapd %xmm2, %xmm0
-; CHECK-NEXT:    retq
-  %res = call <2 x double> @llvm.x86.avx512.mask.move.sd(<2 x double> %x0, <2 x double> %x1, <2 x double> %x2, i8 %x3)
-  ret <2 x double> %res
-}
 
 declare <16 x float> @llvm.x86.avx512.mask.broadcastf32x4.512(<4 x float>, <16 x float>, i16)
 

diff --git a/llvm/test/CodeGen/X86/avx512-load-store.ll b/llvm/test/CodeGen/X86/avx512-load-store.ll
new file mode 100644 (file)
index 0000000..fe1003e
--- /dev/null
+++ b/llvm/test/CodeGen/X86/avx512-load-store.ll
@@ -0,0 +1,169 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -O2 -mattr=avx512f -mtriple=x86_64-unknown | FileCheck %s
+
+define <4 x float> @test_mm_mask_move_ss(<4 x float> %__W, i8 zeroext %__U, <4 x float> %__A, <4 x float> %__B) local_unnamed_addr #0 {
+; CHECK-LABEL: test_mm_mask_move_ss:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovss %xmm2, %xmm1, %xmm0 {%k1}
+; CHECK-NEXT:    retq
+entry:
+  %0 = and i8 %__U, 1
+  %tobool.i = icmp ne i8 %0, 0
+  %__B.elt.i = extractelement <4 x float> %__B, i32 0
+  %__W.elt.i = extractelement <4 x float> %__W, i32 0
+  %vecext1.i = select i1 %tobool.i, float %__B.elt.i, float %__W.elt.i
+  %vecins.i = insertelement <4 x float> %__A, float %vecext1.i, i32 0
+  ret <4 x float> %vecins.i
+}
+
+define <4 x float> @test_mm_maskz_move_ss(i8 zeroext %__U, <4 x float> %__A, <4 x float> %__B) local_unnamed_addr #0 {
+; CHECK-LABEL: test_mm_maskz_move_ss:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovss %xmm1, %xmm0, %xmm0 {%k1} {z}
+; CHECK-NEXT:    retq
+entry:
+  %0 = and i8 %__U, 1
+  %tobool.i = icmp ne i8 %0, 0
+  %vecext.i = extractelement <4 x float> %__B, i32 0
+  %cond.i = select i1 %tobool.i, float %vecext.i, float 0.000000e+00
+  %vecins.i = insertelement <4 x float> %__A, float %cond.i, i32 0
+  ret <4 x float> %vecins.i
+}
+
+define <2 x double> @test_mm_mask_move_sd(<2 x double> %__W, i8 zeroext %__U, <2 x double> %__A, <2 x double> %__B) local_unnamed_addr #0 {
+; CHECK-LABEL: test_mm_mask_move_sd:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovsd %xmm2, %xmm1, %xmm0 {%k1}
+; CHECK-NEXT:    retq
+entry:
+  %0 = and i8 %__U, 1
+  %tobool.i = icmp ne i8 %0, 0
+  %__B.elt.i = extractelement <2 x double> %__B, i32 0
+  %__W.elt.i = extractelement <2 x double> %__W, i32 0
+  %vecext1.i = select i1 %tobool.i, double %__B.elt.i, double %__W.elt.i
+  %vecins.i = insertelement <2 x double> %__A, double %vecext1.i, i32 0
+  ret <2 x double> %vecins.i
+}
+
+define <2 x double> @test_mm_maskz_move_sd(i8 zeroext %__U, <2 x double> %__A, <2 x double> %__B) local_unnamed_addr #0 {
+; CHECK-LABEL: test_mm_maskz_move_sd:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovsd %xmm1, %xmm0, %xmm0 {%k1} {z}
+; CHECK-NEXT:    retq
+entry:
+  %0 = and i8 %__U, 1
+  %tobool.i = icmp ne i8 %0, 0
+  %vecext.i = extractelement <2 x double> %__B, i32 0
+  %cond.i = select i1 %tobool.i, double %vecext.i, double 0.000000e+00
+  %vecins.i = insertelement <2 x double> %__A, double %cond.i, i32 0
+  ret <2 x double> %vecins.i
+}
+
+define void @test_mm_mask_store_ss(float* %__W, i8 zeroext %__U, <4 x float> %__A) local_unnamed_addr #1 {
+; CHECK-LABEL: test_mm_mask_store_ss:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %esi, %k1
+; CHECK-NEXT:    vmovss %xmm0, (%rdi) {%k1}
+; CHECK-NEXT:    retq
+entry:
+  %0 = bitcast float* %__W to <16 x float>*
+  %shuffle.i.i = shufflevector <4 x float> %__A, <4 x float> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
+  %1 = and i8 %__U, 1
+  %conv2.i = zext i8 %1 to i16
+  %2 = bitcast i16 %conv2.i to <16 x i1>
+  tail call void @llvm.masked.store.v16f32.p0v16f32(<16 x float> %shuffle.i.i, <16 x float>* %0, i32 16, <16 x i1> %2) #5
+  ret void
+}
+
+define void @test_mm_mask_store_sd(double* %__W, i8 zeroext %__U, <2 x double> %__A) local_unnamed_addr #1 {
+; CHECK-LABEL: test_mm_mask_store_sd:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %esi, %k1
+; CHECK-NEXT:    vmovsd %xmm0, (%rdi) {%k1}
+; CHECK-NEXT:    retq
+entry:
+  %0 = bitcast double* %__W to <8 x double>*
+  %shuffle.i.i = shufflevector <2 x double> %__A, <2 x double> undef, <8 x i32> <i32 0, i32 1, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
+  %1 = and i8 %__U, 1
+  %2 = bitcast i8 %1 to <8 x i1>
+  tail call void @llvm.masked.store.v8f64.p0v8f64(<8 x double> %shuffle.i.i, <8 x double>* %0, i32 16, <8 x i1> %2) #5
+  ret void
+}
+
+define <4 x float> @test_mm_mask_load_ss(<4 x float> %__A, i8 zeroext %__U, float* %__W) local_unnamed_addr #2 {
+; CHECK-LABEL: test_mm_mask_load_ss:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovss (%rsi), %xmm0 {%k1}
+; CHECK-NEXT:    retq
+entry:
+  %shuffle.i = shufflevector <4 x float> %__A, <4 x float> <float 0.000000e+00, float undef, float undef, float undef>, <4 x i32> <i32 0, i32 4, i32 4, i32 4>
+  %0 = bitcast float* %__W to <16 x float>*
+  %shuffle.i.i = shufflevector <4 x float> %shuffle.i, <4 x float> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
+  %1 = and i8 %__U, 1
+  %conv2.i = zext i8 %1 to i16
+  %2 = bitcast i16 %conv2.i to <16 x i1>
+  %3 = tail call <16 x float> @llvm.masked.load.v16f32.p0v16f32(<16 x float>* %0, i32 16, <16 x i1> %2, <16 x float> %shuffle.i.i) #5
+  %shuffle4.i = shufflevector <16 x float> %3, <16 x float> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
+  ret <4 x float> %shuffle4.i
+}
+
+define <2 x double> @test_mm_mask_load_sd(<2 x double> %__A, i8 zeroext %__U, double* %__W) local_unnamed_addr #2 {
+; CHECK-LABEL: test_mm_mask_load_sd:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovsd (%rsi), %xmm0 {%k1}
+; CHECK-NEXT:    retq
+entry:
+  %shuffle5.i = insertelement <2 x double> %__A, double 0.000000e+00, i32 1
+  %0 = bitcast double* %__W to <8 x double>*
+  %shuffle.i.i = shufflevector <2 x double> %shuffle5.i, <2 x double> undef, <8 x i32> <i32 0, i32 1, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
+  %1 = and i8 %__U, 1
+  %2 = bitcast i8 %1 to <8 x i1>
+  %3 = tail call <8 x double> @llvm.masked.load.v8f64.p0v8f64(<8 x double>* %0, i32 16, <8 x i1> %2, <8 x double> %shuffle.i.i) #5
+  %shuffle3.i = shufflevector <8 x double> %3, <8 x double> undef, <2 x i32> <i32 0, i32 1>
+  ret <2 x double> %shuffle3.i
+}
+
+define <4 x float> @test_mm_maskz_load_ss(i8 zeroext %__U, float* %__W) local_unnamed_addr #2 {
+; CHECK-LABEL: test_mm_maskz_load_ss:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovss (%rsi), %xmm0 {%k1} {z}
+; CHECK-NEXT:    retq
+entry:
+  %0 = bitcast float* %__W to <16 x float>*
+  %1 = and i8 %__U, 1
+  %conv2.i = zext i8 %1 to i16
+  %2 = bitcast i16 %conv2.i to <16 x i1>
+  %3 = tail call <16 x float> @llvm.masked.load.v16f32.p0v16f32(<16 x float>* %0, i32 16, <16 x i1> %2, <16 x float> zeroinitializer) #5
+  %shuffle.i = shufflevector <16 x float> %3, <16 x float> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
+  ret <4 x float> %shuffle.i
+}
+
+define <2 x double> @test_mm_maskz_load_sd(i8 zeroext %__U, double* %__W) local_unnamed_addr #2 {
+; CHECK-LABEL: test_mm_maskz_load_sd:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovsd (%rsi), %xmm0 {%k1} {z}
+; CHECK-NEXT:    retq
+entry:
+  %0 = bitcast double* %__W to <8 x double>*
+  %1 = and i8 %__U, 1
+  %2 = bitcast i8 %1 to <8 x i1>
+  %3 = tail call <8 x double> @llvm.masked.load.v8f64.p0v8f64(<8 x double>* %0, i32 16, <8 x i1> %2, <8 x double> zeroinitializer) #5
+  %shuffle.i = shufflevector <8 x double> %3, <8 x double> undef, <2 x i32> <i32 0, i32 1>
+  ret <2 x double> %shuffle.i
+}
+
+declare void @llvm.masked.store.v16f32.p0v16f32(<16 x float>, <16 x float>*, i32, <16 x i1>) #3
+
+declare void @llvm.masked.store.v8f64.p0v8f64(<8 x double>, <8 x double>*, i32, <8 x i1>) #3
+
+declare <16 x float> @llvm.masked.load.v16f32.p0v16f32(<16 x float>*, i32, <16 x i1>, <16 x float>) #4
+
+declare <8 x double> @llvm.masked.load.v8f64.p0v8f64(<8 x double>*, i32, <8 x i1>, <8 x double>) #4