Remove unused pshufw instruction

Bug: v8:9810
Change-Id: I5eb359f9bc04be4c0855a5161b7c525c803f679f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1873187Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64442}

src/codegen/x64/assembler-x64.cc

@@ -1023,24 +1023,6 @@ void Assembler::bsfq(Register dst, Operand src) {
   emit_operand(dst, src);
 }
 
-void Assembler::pshufw(XMMRegister dst, XMMRegister src, uint8_t shuffle) {
-  EnsureSpace ensure_space(this);
-  emit_optional_rex_32(dst, src);
-  emit(0x0F);
-  emit(0x70);
-  emit_sse_operand(dst, src);
-  emit(shuffle);
-}
-
-void Assembler::pshufw(XMMRegister dst, Operand src, uint8_t shuffle) {
-  EnsureSpace ensure_space(this);
-  emit_optional_rex_32(dst, src);
-  emit(0x0F);
-  emit(0x70);
-  emit_operand(dst.code(), src);
-  emit(shuffle);
-}
-
 void Assembler::pblendw(XMMRegister dst, Operand src, uint8_t mask) {
   sse4_instr(dst, src, 0x66, 0x0F, 0x3A, 0x0E);
   emit(mask);

src/codegen/x64/assembler-x64.h

@@ -696,8 +696,6 @@ class V8_EXPORT_PRIVATE Assembler : public AssemblerBase {
   void ud2();
   void setcc(Condition cc, Register reg);
 
-  void pshufw(XMMRegister dst, XMMRegister src, uint8_t shuffle);
-  void pshufw(XMMRegister dst, Operand src, uint8_t shuffle);
   void pblendw(XMMRegister dst, Operand src, uint8_t mask);
   void pblendw(XMMRegister dst, XMMRegister src, uint8_t mask);
   void palignr(XMMRegister dst, Operand src, uint8_t mask);

src/diagnostics/x64/disasm-x64.cc

@@ -2293,13 +2293,6 @@ int DisassemblerX64::TwoByteOpcodeInstruction(byte* data) {
     get_modrm(*current, &mod, &regop, &rm);
     AppendToBuffer("movmskps %s,", NameOfCPURegister(regop));
     current += PrintRightXMMOperand(current);
-  } else if (opcode == 0x70) {
-    int mod, regop, rm;
-    get_modrm(*current, &mod, &regop, &rm);
-    AppendToBuffer("pshufw %s, ", NameOfXMMRegister(regop));
-    current += PrintRightXMMOperand(current);
-    AppendToBuffer(", %d", (*current) & 3);
-    current += 1;
   } else if ((opcode & 0xF0) == 0x80) {
     // Jcc: Conditional jump (branch).
     current = data + JumpConditional(data);

test/cctest/test-disasm-x64.cc

@@ -268,7 +268,6 @@ TEST(DisasmX64) {
 
   __ xorq(rdx, Immediate(12345));
   __ xorq(rdx, Operand(rbx, rcx, times_8, 10000));
-  __ pshufw(xmm5, xmm1, 3);
   __ hlt();
   __ int3();
   __ ret(0);