1 files changed, 32 insertions, 8 deletions
diff --git a/chromium/v8/src/codegen/x64/assembler-x64.cc b/chromium/v8/src/codegen/x64/assembler-x64.cc
index 1d28f1d45dd..1783da700ba 100644
--- a/chromium/v8/src/codegen/x64/assembler-x64.cc
+++ b/chromium/v8/src/codegen/x64/assembler-x64.cc
@@ -109,15 +109,16 @@ void CpuFeatures::ProbeImpl(bool cross_compile) {
 void CpuFeatures::PrintTarget() {}
 void CpuFeatures::PrintFeatures() {
   printf(
-      "SSE3=%d SSSE3=%d SSE4_1=%d SAHF=%d AVX=%d FMA3=%d BMI1=%d BMI2=%d "
+      "SSE3=%d SSSE3=%d SSE4_1=%d SSE4_2=%d SAHF=%d AVX=%d FMA3=%d BMI1=%d "
+      "BMI2=%d "
       "LZCNT=%d "
       "POPCNT=%d ATOM=%d\n",
       CpuFeatures::IsSupported(SSE3), CpuFeatures::IsSupported(SSSE3),
-      CpuFeatures::IsSupported(SSE4_1), CpuFeatures::IsSupported(SAHF),
-      CpuFeatures::IsSupported(AVX), CpuFeatures::IsSupported(FMA3),
-      CpuFeatures::IsSupported(BMI1), CpuFeatures::IsSupported(BMI2),
-      CpuFeatures::IsSupported(LZCNT), CpuFeatures::IsSupported(POPCNT),
-      CpuFeatures::IsSupported(ATOM));
+      CpuFeatures::IsSupported(SSE4_1), CpuFeatures::IsSupported(SSE4_2),
+      CpuFeatures::IsSupported(SAHF), CpuFeatures::IsSupported(AVX),
+      CpuFeatures::IsSupported(FMA3), CpuFeatures::IsSupported(BMI1),
+      CpuFeatures::IsSupported(BMI2), CpuFeatures::IsSupported(LZCNT),
+      CpuFeatures::IsSupported(POPCNT), CpuFeatures::IsSupported(ATOM));
 }
 
 // -----------------------------------------------------------------------------
@@ -428,6 +429,9 @@ Assembler::Assembler(const AssemblerOptions& options,
                      std::unique_ptr<AssemblerBuffer> buffer)
     : AssemblerBase(options, std::move(buffer)), constpool_(this) {
   reloc_info_writer.Reposition(buffer_start_ + buffer_->size(), pc_);
+  if (CpuFeatures::IsSupported(SSE4_2)) {
+    EnableCpuFeature(SSE4_1);
+  }
   if (CpuFeatures::IsSupported(SSE4_1)) {
     EnableCpuFeature(SSSE3);
   }
@@ -3524,8 +3528,8 @@ void Assembler::cmpps(XMMRegister dst, Operand src, int8_t cmp) {
 
 void Assembler::cmppd(XMMRegister dst, XMMRegister src, int8_t cmp) {
   EnsureSpace ensure_space(this);
-  emit_optional_rex_32(dst, src);
   emit(0x66);
+  emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0xC2);
   emit_sse_operand(dst, src);
@@ -3534,8 +3538,8 @@ void Assembler::cmppd(XMMRegister dst, XMMRegister src, int8_t cmp) {
 
 void Assembler::cmppd(XMMRegister dst, Operand src, int8_t cmp) {
   EnsureSpace ensure_space(this);
-  emit_optional_rex_32(dst, src);
   emit(0x66);
+  emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0xC2);
   emit_sse_operand(dst, src);
@@ -4716,6 +4720,26 @@ void Assembler::lddqu(XMMRegister dst, Operand src) {
   emit_sse_operand(dst, src);
 }
 
+void Assembler::movddup(XMMRegister dst, XMMRegister src) {
+  DCHECK(IsEnabled(SSE3));
+  EnsureSpace ensure_space(this);
+  emit(0xF2);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0x12);
+  emit_sse_operand(dst, src);
+}
+
+void Assembler::movddup(XMMRegister dst, Operand src) {
+  DCHECK(IsEnabled(SSE3));
+  EnsureSpace ensure_space(this);
+  emit(0xF2);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0x12);
+  emit_sse_operand(dst, src);
+}
+
 void Assembler::psrldq(XMMRegister dst, uint8_t shift) {
   EnsureSpace ensure_space(this);
   emit(0x66);