[x64] Implement vcvtqsi2sd AVX instruction.

test/cctest/test-assembler-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
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 // 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 1476 matching lines @@
     // Test vroundsd
     __ movl(rax, Immediate(16));
     __ movq(rdx, V8_UINT64_C(0x4002000000000000));  // 2.25
     __ vmovq(xmm4, rdx);
     __ vroundsd(xmm5, xmm4, xmm4, kRoundUp);
     __ movq(rcx, V8_UINT64_C(0x4008000000000000));  // 3.0
     __ vmovq(xmm6, rcx);
     __ vucomisd(xmm5, xmm6);
     __ j(not_equal, &exit);
 
+    // Test vcvtlsi2sd
+    __ movl(rax, Immediate(17));
     __ movl(rdx, Immediate(6));
+    __ movq(rcx, V8_UINT64_C(0x4018000000000000));  // 6.0
+    __ vmovq(xmm5, rcx);
     __ vcvtlsi2sd(xmm6, xmm6, rdx);
-    __ movl(Operand(rsp, 0), Immediate(5));
+    __ vucomisd(xmm5, xmm6);
+    __ j(not_equal, &exit);
+    __ movl(Operand(rsp, 0), rdx);
     __ vcvtlsi2sd(xmm7, xmm7, Operand(rsp, 0));
-    __ vsubsd(xmm7, xmm6, xmm7);  // xmm7 is 1.0
-    __ vmulsd(xmm1, xmm1, xmm7);
+    __ vucomisd(xmm5, xmm6);
+    __ j(not_equal, &exit);
+
+    // Test vcvtqsi2sd
+    __ movl(rax, Immediate(18));
+    __ movq(rdx, V8_UINT64_C(0x2000000000000000));  // 2 << 0x3c
+    __ movq(rcx, V8_UINT64_C(0x43c0000000000000));
+    __ vmovq(xmm5, rcx);
+    __ vcvtqsi2sd(xmm6, xmm6, rdx);
+    __ vucomisd(xmm5, xmm6);
+    __ j(not_equal, &exit);
 
     __ movq(rdx, V8_INT64_C(0x3ff0000000000000));  // 1.0
     __ vmovq(xmm7, rdx);
     __ vmulsd(xmm1, xmm1, xmm7);
     __ movq(Operand(rsp, 0), rdx);
     __ vmovq(xmm6, Operand(rsp, 0));
     __ vmulsd(xmm1, xmm1, xmm6);
 
     __ vucomisd(xmm3, xmm1);
     __ j(parity_even, &exit);
@@ skipping 711 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 __