[x64] Implement vcvtsd2si 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
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 //
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@@ skipping 1498 matching lines @@
 
     // 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);
 
+    // Test vcvtsd2si
+    __ movl(rax, Immediate(19));
+    __ movq(rdx, V8_UINT64_C(0x4018000000000000));  // 6.0
+    __ vmovq(xmm5, rdx);
+    __ vcvtsd2si(rcx, xmm5);
+    __ cmpl(rcx, Immediate(6));
+    __ 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);
     __ j(not_equal, &exit);
@@ skipping 710 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 __