X87: fix the sqrt 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 89ecff0a709dc4dab18f760ae834abe79cb4aa85..838d2d2e126c8be44dab189ba091f9e10d874c91 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -974,7 +974,21 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kX87Float64Sqrt: {
       __ 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));
       break;
     }