Faster implementation of Math.exp()

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index fa3e1a88bbf6c0da3e29852af70b099e46539886..da8e2ae4576796285ee2fcbd769beeb3a3f05e39 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -3115,10 +3115,10 @@ void MathPowStub::Generate(MacroAssembler* masm) {
     // F2XM1 calculates 2^st(0) - 1 for -1 < st(0) < 1
     __ f2xm1();    // 2^(X-rnd(X)) - 1, rnd(X)
     __ fld1();     // 1, 2^(X-rnd(X)) - 1, rnd(X)
-    __ faddp(1);   // 1, 2^(X-rnd(X)), rnd(X)
+    __ faddp(1);   // 2^(X-rnd(X)), rnd(X)
     // FSCALE calculates st(0) * 2^st(1)
     __ fscale();   // 2^X, rnd(X)
-    __ fstp(1);
+    __ fstp(1);    // 2^X
     // Bail out to runtime in case of exceptions in the status word.
     __ fnstsw_ax();
     __ test_b(eax, 0x5F);  // We check for all but precision exception.