[x64] Implement vsqrtsd AVX instruction.

test/cctest/test-assembler-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1451 matching lines @@
     __ j(not_equal, &exit);
     __ vorpd(xmm6, xmm4, xmm5);
     __ movd(rdx, xmm6);
     __ cmpl(rdx, Immediate(0x0fff0fff));
     __ j(not_equal, &exit);
     __ vxorpd(xmm6, xmm4, xmm5);
     __ movd(rdx, xmm6);
     __ cmpl(rdx, Immediate(0x0ff00ff0));
     __ j(not_equal, &exit);
 
+    // Test vsqrtsd
+    __ movl(rax, Immediate(15));
+    __ movq(rdx, V8_UINT64_C(0x4004000000000000));  // 2.5
+    __ vmovq(xmm4, rdx);
+    __ vmulsd(xmm5, xmm4, xmm4);
+    __ vmovsd(Operand(rsp, 0), xmm5);
+    __ vsqrtsd(xmm6, xmm5, xmm5);
+    __ vmovq(rcx, xmm6);
+    __ cmpq(rcx, rdx);
+    __ j(not_equal, &exit);
+    __ vsqrtsd(xmm7, xmm7, Operand(rsp, 0));
+    __ vmovq(rcx, xmm7);
+    __ cmpq(rcx, rdx);
+    __ j(not_equal, &exit);
+
     __ movl(rdx, Immediate(6));
     __ vcvtlsi2sd(xmm6, xmm6, rdx);
     __ movl(Operand(rsp, 0), Immediate(5));
     __ vcvtlsi2sd(xmm7, xmm7, Operand(rsp, 0));
     __ vsubsd(xmm7, xmm6, xmm7);  // xmm7 is 1.0
     __ vmulsd(xmm1, xmm1, xmm7);
 
     __ movq(rdx, V8_INT64_C(0x3ff0000000000000));  // 1.0
     __ vmovq(xmm7, rdx);
     __ vmulsd(xmm1, xmm1, xmm7);
@@ skipping 717 matching lines @@
 
   F1 f = FUNCTION_CAST<F1>(code->entry());
   for (int i = 0; i < kNumCases; ++i) {
     int res = f(i);
     PrintF("f(%d) = %d\n", i, res);
     CHECK_EQ(values[i], res);
   }
 }
 
 #undef __