diff --git a/src/codegen/ia32/assembler-ia32.cc b/src/codegen/ia32/assembler-ia32.cc
index ba9e0d521c..931297be53 100644
--- a/src/codegen/ia32/assembler-ia32.cc
+++ b/src/codegen/ia32/assembler-ia32.cc
@@ -2973,6 +2973,24 @@ void Assembler::vpshufd(XMMRegister dst, Operand src, uint8_t shuffle) {
   EMIT(shuffle);
 }
 
+void Assembler::vblendvps(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                          XMMRegister mask) {
+  vinstr(0x4A, dst, src1, src2, k66, k0F3A, kW0);
+  EMIT(mask.code() << 4);
+}
+
+void Assembler::vblendvpd(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                          XMMRegister mask) {
+  vinstr(0x4B, dst, src1, src2, k66, k0F3A, kW0);
+  EMIT(mask.code() << 4);
+}
+
+void Assembler::vpblendvb(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                          XMMRegister mask) {
+  vinstr(0x4C, dst, src1, src2, k66, k0F3A, kW0);
+  EMIT(mask.code() << 4);
+}
+
 void Assembler::vpblendw(XMMRegister dst, XMMRegister src1, Operand src2,
                          uint8_t mask) {
   vinstr(0x0E, dst, src1, src2, k66, k0F3A, kWIG);
diff --git a/src/codegen/ia32/assembler-ia32.h b/src/codegen/ia32/assembler-ia32.h
index 4f71e09ee0..21db98199d 100644
--- a/src/codegen/ia32/assembler-ia32.h
+++ b/src/codegen/ia32/assembler-ia32.h
@@ -1406,6 +1406,13 @@ class V8_EXPORT_PRIVATE Assembler : public AssemblerBase {
   }
   void vpshufd(XMMRegister dst, Operand src, uint8_t shuffle);
 
+  void vblendvps(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                 XMMRegister mask);
+  void vblendvpd(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                 XMMRegister mask);
+  void vpblendvb(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                 XMMRegister mask);
+
   void vpblendw(XMMRegister dst, XMMRegister src1, XMMRegister src2,
                 uint8_t mask) {
     vpblendw(dst, src1, Operand(src2), mask);
@@ -1692,6 +1699,9 @@ class V8_EXPORT_PRIVATE Assembler : public AssemblerBase {
 
   SSE4_INSTRUCTION_LIST(DECLARE_SSE4_INSTRUCTION)
   SSE4_RM_INSTRUCTION_LIST(DECLARE_SSE4_INSTRUCTION)
+  DECLARE_SSE4_INSTRUCTION(blendvps, 66, 0F, 38, 14)
+  DECLARE_SSE4_INSTRUCTION(blendvpd, 66, 0F, 38, 15)
+  DECLARE_SSE4_INSTRUCTION(pblendvb, 66, 0F, 38, 10)
 #undef DECLARE_SSE4_INSTRUCTION
 
 #define DECLARE_SSE34_AVX_INSTRUCTION(instruction, prefix, escape1, escape2,  \
diff --git a/src/codegen/ia32/macro-assembler-ia32.cc b/src/codegen/ia32/macro-assembler-ia32.cc
index 072b7f29c6..2ee7edea81 100644
--- a/src/codegen/ia32/macro-assembler-ia32.cc
+++ b/src/codegen/ia32/macro-assembler-ia32.cc
@@ -1635,6 +1635,45 @@ void TurboAssembler::Pshufb(XMMRegister dst, XMMRegister src, Operand mask) {
   FATAL("no AVX or SSE3 support");
 }
 
+void TurboAssembler::Blendvps(XMMRegister dst, XMMRegister src1,
+                              XMMRegister src2, XMMRegister mask) {
+  if (CpuFeatures::IsSupported(AVX)) {
+    CpuFeatureScope avx_scope(this, AVX);
+    vblendvps(dst, src1, src2, mask);
+  } else {
+    CpuFeatureScope scope(this, SSE4_1);
+    DCHECK_EQ(dst, src1);
+    DCHECK_EQ(xmm0, mask);
+    blendvps(dst, src2);
+  }
+}
+
+void TurboAssembler::Blendvpd(XMMRegister dst, XMMRegister src1,
+                              XMMRegister src2, XMMRegister mask) {
+  if (CpuFeatures::IsSupported(AVX)) {
+    CpuFeatureScope avx_scope(this, AVX);
+    vblendvpd(dst, src1, src2, mask);
+  } else {
+    CpuFeatureScope scope(this, SSE4_1);
+    DCHECK_EQ(dst, src1);
+    DCHECK_EQ(xmm0, mask);
+    blendvpd(dst, src2);
+  }
+}
+
+void TurboAssembler::Pblendvb(XMMRegister dst, XMMRegister src1,
+                              XMMRegister src2, XMMRegister mask) {
+  if (CpuFeatures::IsSupported(AVX)) {
+    CpuFeatureScope avx_scope(this, AVX);
+    vpblendvb(dst, src1, src2, mask);
+  } else {
+    CpuFeatureScope scope(this, SSE4_1);
+    DCHECK_EQ(dst, src1);
+    DCHECK_EQ(xmm0, mask);
+    pblendvb(dst, src2);
+  }
+}
+
 void TurboAssembler::Pblendw(XMMRegister dst, Operand src, uint8_t imm8) {
   if (CpuFeatures::IsSupported(AVX)) {
     CpuFeatureScope scope(this, AVX);
diff --git a/src/codegen/ia32/macro-assembler-ia32.h b/src/codegen/ia32/macro-assembler-ia32.h
index e7d0410d5c..e7da2f60db 100644
--- a/src/codegen/ia32/macro-assembler-ia32.h
+++ b/src/codegen/ia32/macro-assembler-ia32.h
@@ -505,6 +505,14 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
     Pshufb(dst, src, Operand(mask));
   }
   void Pshufb(XMMRegister dst, XMMRegister src, Operand mask);
+
+  void Blendvps(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                XMMRegister mask);
+  void Blendvpd(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                XMMRegister mask);
+  void Pblendvb(XMMRegister dst, XMMRegister src1, XMMRegister src2,
+                XMMRegister mask);
+
   void Pblendw(XMMRegister dst, XMMRegister src, uint8_t imm8) {
     Pblendw(dst, Operand(src), imm8);
   }
diff --git a/src/compiler/backend/ia32/code-generator-ia32.cc b/src/compiler/backend/ia32/code-generator-ia32.cc
index cdc9bc5f2c..83a5c34f82 100644
--- a/src/compiler/backend/ia32/code-generator-ia32.cc
+++ b/src/compiler/backend/ia32/code-generator-ia32.cc
@@ -2158,6 +2158,40 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
                  i.InputSimd128Register(1));
       break;
     }
+    case kIA32I8x16SignSelect: {
+      __ Pblendvb(i.OutputSimd128Register(), i.InputSimd128Register(0),
+                  i.InputSimd128Register(1), i.InputSimd128Register(2));
+      break;
+    }
+    case kIA32I16x8SignSelect: {
+      if (CpuFeatures::IsSupported(AVX)) {
+        CpuFeatureScope avx_scope(tasm(), AVX);
+        __ vpsraw(kScratchDoubleReg, i.InputSimd128Register(2), 15);
+        __ vpblendvb(i.OutputSimd128Register(), i.InputSimd128Register(0),
+                     i.InputSimd128Register(1), kScratchDoubleReg);
+      } else {
+        DCHECK_EQ(i.OutputSimd128Register(), i.InputSimd128Register(0));
+        XMMRegister mask = i.InputSimd128Register(2);
+        DCHECK_EQ(xmm0, mask);
+        __ movapd(kScratchDoubleReg, mask);
+        __ pxor(mask, mask);
+        __ pcmpgtw(mask, kScratchDoubleReg);
+        __ pblendvb(i.OutputSimd128Register(), i.InputSimd128Register(1));
+        // Restore mask.
+        __ movapd(mask, kScratchDoubleReg);
+      }
+      break;
+    }
+    case kIA32I32x4SignSelect: {
+      __ Blendvps(i.OutputSimd128Register(), i.InputSimd128Register(0),
+                  i.InputSimd128Register(1), i.InputSimd128Register(2));
+      break;
+    }
+    case kIA32I64x2SignSelect: {
+      __ Blendvpd(i.OutputSimd128Register(), i.InputSimd128Register(0),
+                  i.InputSimd128Register(1), i.InputSimd128Register(2));
+      break;
+    }
     case kSSEF32x4Splat: {
       DCHECK_EQ(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       XMMRegister dst = i.OutputSimd128Register();
diff --git a/src/compiler/backend/ia32/instruction-codes-ia32.h b/src/compiler/backend/ia32/instruction-codes-ia32.h
index 96b3ab80cc..b72cdbd08f 100644
--- a/src/compiler/backend/ia32/instruction-codes-ia32.h
+++ b/src/compiler/backend/ia32/instruction-codes-ia32.h
@@ -150,6 +150,7 @@ namespace compiler {
   V(IA32I64x2ShrU)                 \
   V(IA32I64x2BitMask)              \
   V(IA32I64x2Eq)                   \
+  V(IA32I64x2SignSelect)           \
   V(SSEF32x4Splat)                 \
   V(AVXF32x4Splat)                 \
   V(SSEF32x4ExtractLane)           \
@@ -236,6 +237,7 @@ namespace compiler {
   V(IA32I32x4Abs)                  \
   V(IA32I32x4BitMask)              \
   V(IA32I32x4DotI16x8S)            \
+  V(IA32I32x4SignSelect)           \
   V(IA32I16x8Splat)                \
   V(IA32I16x8ExtractLaneS)         \
   V(IA32I16x8SConvertI8x16Low)     \
@@ -289,6 +291,7 @@ namespace compiler {
   V(IA32I16x8RoundingAverageU)     \
   V(IA32I16x8Abs)                  \
   V(IA32I16x8BitMask)              \
+  V(IA32I16x8SignSelect)           \
   V(IA32I8x16Splat)                \
   V(IA32I8x16ExtractLaneS)         \
   V(IA32Pinsrb)                    \
@@ -342,6 +345,7 @@ namespace compiler {
   V(IA32I8x16RoundingAverageU)     \
   V(IA32I8x16Abs)                  \
   V(IA32I8x16BitMask)              \
+  V(IA32I8x16SignSelect)           \
   V(IA32S128Const)                 \
   V(IA32S128Zero)                  \
   V(IA32S128AllOnes)               \
diff --git a/src/compiler/backend/ia32/instruction-scheduler-ia32.cc b/src/compiler/backend/ia32/instruction-scheduler-ia32.cc
index 6de3b792a0..8a555f3825 100644
--- a/src/compiler/backend/ia32/instruction-scheduler-ia32.cc
+++ b/src/compiler/backend/ia32/instruction-scheduler-ia32.cc
@@ -129,6 +129,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kIA32I64x2ShrU:
     case kIA32I64x2BitMask:
     case kIA32I64x2Eq:
+    case kIA32I64x2SignSelect:
     case kSSEF32x4Splat:
     case kAVXF32x4Splat:
     case kSSEF32x4ExtractLane:
@@ -215,6 +216,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kIA32I32x4Abs:
     case kIA32I32x4BitMask:
     case kIA32I32x4DotI16x8S:
+    case kIA32I32x4SignSelect:
     case kIA32I16x8Splat:
     case kIA32I16x8ExtractLaneS:
     case kIA32I16x8SConvertI8x16Low:
@@ -268,6 +270,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kIA32I16x8RoundingAverageU:
     case kIA32I16x8Abs:
     case kIA32I16x8BitMask:
+    case kIA32I16x8SignSelect:
     case kIA32I8x16Splat:
     case kIA32I8x16ExtractLaneS:
     case kIA32Pinsrb:
@@ -321,6 +324,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kIA32I8x16RoundingAverageU:
     case kIA32I8x16Abs:
     case kIA32I8x16BitMask:
+    case kIA32I8x16SignSelect:
     case kIA32S128Const:
     case kIA32S128Zero:
     case kIA32S128AllOnes:
diff --git a/src/compiler/backend/ia32/instruction-selector-ia32.cc b/src/compiler/backend/ia32/instruction-selector-ia32.cc
index 11f85ec9b3..ca8b074e9e 100644
--- a/src/compiler/backend/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/backend/ia32/instruction-selector-ia32.cc
@@ -2993,6 +2993,40 @@ void InstructionSelector::VisitF64x2Pmax(Node* node) {
   VisitPminOrPmax(this, node, kIA32F64x2Pmax);
 }
 
+namespace {
+void VisitSignSelect(InstructionSelector* selector, Node* node,
+                     ArchOpcode opcode) {
+  IA32OperandGenerator g(selector);
+  // signselect(x, y, -1) = x
+  // pblendvb(dst, x, y, -1) = dst <- y, so we need to swap x and y.
+  if (selector->IsSupported(AVX)) {
+    selector->Emit(
+        opcode, g.DefineAsRegister(node), g.UseRegister(node->InputAt(1)),
+        g.UseRegister(node->InputAt(0)), g.UseRegister(node->InputAt(2)));
+  } else {
+    selector->Emit(
+        opcode, g.DefineSameAsFirst(node), g.UseRegister(node->InputAt(1)),
+        g.UseRegister(node->InputAt(0)), g.UseFixed(node->InputAt(2), xmm0));
+  }
+}
+}  // namespace
+
+void InstructionSelector::VisitI8x16SignSelect(Node* node) {
+  VisitSignSelect(this, node, kIA32I8x16SignSelect);
+}
+
+void InstructionSelector::VisitI16x8SignSelect(Node* node) {
+  VisitSignSelect(this, node, kIA32I16x8SignSelect);
+}
+
+void InstructionSelector::VisitI32x4SignSelect(Node* node) {
+  VisitSignSelect(this, node, kIA32I32x4SignSelect);
+}
+
+void InstructionSelector::VisitI64x2SignSelect(Node* node) {
+  VisitSignSelect(this, node, kIA32I64x2SignSelect);
+}
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
diff --git a/src/compiler/backend/instruction-selector.cc b/src/compiler/backend/instruction-selector.cc
index 045e9d5245..dc30d7c7df 100644
--- a/src/compiler/backend/instruction-selector.cc
+++ b/src/compiler/backend/instruction-selector.cc
@@ -2826,13 +2826,13 @@ void InstructionSelector::VisitLoadLane(Node* node) { UNIMPLEMENTED(); }
 void InstructionSelector::VisitStoreLane(Node* node) { UNIMPLEMENTED(); }
 #endif  // !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_ARM64
 
-#if !V8_TARGET_ARCH_X64
+#if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32
 // TODO(v8:10983) Prototyping sign select.
 void InstructionSelector::VisitI8x16SignSelect(Node* node) { UNIMPLEMENTED(); }
 void InstructionSelector::VisitI16x8SignSelect(Node* node) { UNIMPLEMENTED(); }
 void InstructionSelector::VisitI32x4SignSelect(Node* node) { UNIMPLEMENTED(); }
 void InstructionSelector::VisitI64x2SignSelect(Node* node) { UNIMPLEMENTED(); }
-#endif  // !V8_TARGET_ARCH_X64
+#endif  // !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32
 
 #if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_ARM64 && !V8_TARGET_ARCH_ARM && \
     !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_MIPS64 && !V8_TARGET_ARCH_MIPS
diff --git a/src/diagnostics/ia32/disasm-ia32.cc b/src/diagnostics/ia32/disasm-ia32.cc
index 32706cfd97..d7b57f9ad2 100644
--- a/src/diagnostics/ia32/disasm-ia32.cc
+++ b/src/diagnostics/ia32/disasm-ia32.cc
@@ -856,6 +856,24 @@ int DisassemblerIA32::AVXInstruction(byte* data) {
         AppendToBuffer(",%d", Imm8(current));
         current++;
         break;
+      case 0x4A:
+        AppendToBuffer("vblendvps %s,%s,", NameOfXMMRegister(regop),
+                       NameOfXMMRegister(vvvv));
+        current += PrintRightXMMOperand(current);
+        AppendToBuffer(",%s", NameOfXMMRegister(*current >> 4));
+        break;
+      case 0x4B:
+        AppendToBuffer("vblendvps %s,%s,", NameOfXMMRegister(regop),
+                       NameOfXMMRegister(vvvv));
+        current += PrintRightXMMOperand(current);
+        AppendToBuffer(",%s", NameOfXMMRegister(*current >> 4));
+        break;
+      case 0x4C:
+        AppendToBuffer("vpblendvb %s,%s,", NameOfXMMRegister(regop),
+                       NameOfXMMRegister(vvvv));
+        current += PrintRightXMMOperand(current);
+        AppendToBuffer(",%s", NameOfXMMRegister(*current >> 4));
+        break;
       default:
         UnimplementedInstruction();
     }
@@ -2189,6 +2207,21 @@ int DisassemblerIA32::InstructionDecode(v8::internal::Vector<char> out_buffer,
               SSE4_INSTRUCTION_LIST(SSE34_DIS_CASE)
               SSE4_RM_INSTRUCTION_LIST(SSE34_DIS_CASE)
 #undef SSE34_DIS_CASE
+              case 0x10:
+                AppendToBuffer("pblendvb %s,", NameOfXMMRegister(regop));
+                data += PrintRightXMMOperand(data);
+                AppendToBuffer(",xmm0");
+                break;
+              case 0x14:
+                AppendToBuffer("blendvps %s,", NameOfXMMRegister(regop));
+                data += PrintRightXMMOperand(data);
+                AppendToBuffer(",xmm0");
+                break;
+              case 0x15:
+                AppendToBuffer("blendvps %s,", NameOfXMMRegister(regop));
+                data += PrintRightXMMOperand(data);
+                AppendToBuffer(",xmm0");
+                break;
               default:
                 UnimplementedInstruction();
             }
diff --git a/test/cctest/test-disasm-ia32.cc b/test/cctest/test-disasm-ia32.cc
index da0b0c83ff..f40e2e5ea0 100644
--- a/test/cctest/test-disasm-ia32.cc
+++ b/test/cctest/test-disasm-ia32.cc
@@ -627,6 +627,10 @@ TEST(DisasmIa320) {
       __ pinsrd(xmm1, Operand(edx, 4), 0);
       __ extractps(eax, xmm1, 0);
 
+      __ blendvps(xmm3, xmm1);
+      __ blendvpd(xmm3, xmm1);
+      __ pblendvb(xmm3, xmm1);
+
       SSE4_INSTRUCTION_LIST(EMIT_SSE34_INSTR)
       SSE4_RM_INSTRUCTION_LIST(EMIT_SSE34_INSTR)
     }
@@ -786,6 +790,10 @@ TEST(DisasmIa320) {
       __ vpinsrd(xmm0, xmm1, eax, 0);
       __ vpinsrd(xmm0, xmm1, Operand(edx, 4), 0);
 
+      __ vblendvps(xmm3, xmm1, xmm4, xmm6);
+      __ vblendvpd(xmm3, xmm1, xmm4, xmm6);
+      __ vpblendvb(xmm3, xmm1, xmm4, xmm6);
+
       __ vcvtdq2ps(xmm1, xmm0);
       __ vcvtdq2ps(xmm1, Operand(ebx, ecx, times_4, 10000));
       __ vcvttps2dq(xmm1, xmm0);
diff --git a/test/cctest/wasm/test-run-wasm-simd.cc b/test/cctest/wasm/test-run-wasm-simd.cc
index dec12f2d89..2752237554 100644
--- a/test/cctest/wasm/test-run-wasm-simd.cc
+++ b/test/cctest/wasm/test-run-wasm-simd.cc
@@ -765,7 +765,7 @@ WASM_SIMD_TEST(F32x4Le) {
   RunF32x4CompareOpTest(execution_tier, lower_simd, kExprF32x4Le, LessEqual);
 }
 
-#if V8_TARGET_ARCH_X64
+#if V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_IA32
 // TODO(v8:10983) Prototyping sign select.
 template <typename T>
 void RunSignSelect(TestExecutionTier execution_tier, LowerSimd lower_simd,
@@ -822,7 +822,7 @@ WASM_SIMD_TEST_NO_LOWERING(I64x2SignSelect) {
   RunSignSelect<int64_t>(execution_tier, lower_simd, kExprI64x2SignSelect,
                          kExprI64x2Splat, mask);
 }
-#endif  // V8_TARGET_ARCH_X64
+#endif  // V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_IA32
 
 #if V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_S390X
 WASM_SIMD_TEST_NO_LOWERING(F32x4Qfma) {