X87: Fix the sqrt precision issue.

src/compiler/x87/code-generator-x87.cc

Index: src/compiler/x87/code-generator-x87.cc
diff --git a/src/compiler/x87/code-generator-x87.cc b/src/compiler/x87/code-generator-x87.cc
index 838d2d2e126c8be44dab189ba091f9e10d874c91..e574c05742ea0d8cb6c6a6351858c9bbf24d81a7 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -972,24 +972,12 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kX87Float64Sqrt: {
+      __ X87SetFPUCW(0x027F);
       __ fstp(0);
       __ fld_d(MemOperand(esp, 0));
-#if V8_GLIBC_PREREQ(2, 19)
-      __ push(edx);
-      __ sub(esp, Immediate(2 * kIntSize));
-      __ fnstcw(MemOperand(esp, 4));
-      __ mov(edx, Immediate(0xfeff));
-      __ and_(edx, MemOperand(esp, 4));
-      __ mov(MemOperand(esp, 0), edx);
-      __ fldcw(MemOperand(esp, 0));
-#endif
       __ fsqrt();
-#if V8_GLIBC_PREREQ(2, 19)
-      __ fldcw(MemOperand(esp, 4));
-      __ lea(esp, Operand(esp, 2 * kIntSize));
-      __ pop(edx);
-#endif
       __ lea(esp, Operand(esp, kDoubleSize));
+      __ X87SetFPUCW(0x037F);
       break;
     }
     case kX87Float64Round: {