diff --git a/posix.mak b/posix.mak
index 5e0d44e2bd..2aa655b1e2 100644
--- a/posix.mak
+++ b/posix.mak
@@ -55,6 +55,7 @@ MANIFEST= \
 	src/core/cpuid.d \
 	src/core/demangle.d \
 	src/core/exception.d \
+	src/core/math.d \
 	src/core/memory.d \
 	src/core/runtime.d \
 	src/core/thread.d \
@@ -243,6 +244,7 @@ SRC_D_MODULES = \
 	core/cpuid \
 	core/demangle \
 	core/exception \
+	core/math \
 	core/memory \
 	core/runtime \
 	core/thread \
@@ -371,6 +373,7 @@ DOCS=\
 	$(DOCDIR)/core_cpuid.html \
 	$(DOCDIR)/core_demangle.html \
 	$(DOCDIR)/core_exception.html \
+	$(DOCDIR)/core_math.html \
 	$(DOCDIR)/core_memory.html \
 	$(DOCDIR)/core_runtime.html \
 	$(DOCDIR)/core_thread.html \
@@ -391,6 +394,7 @@ IMPORTS=\
 	$(IMPDIR)/core/cpuid.di \
 	$(IMPDIR)/core/demangle.di \
 	$(IMPDIR)/core/exception.di \
+	$(IMPDIR)/core/math.di \
 	$(IMPDIR)/core/memory.di \
 	$(IMPDIR)/core/runtime.di \
 	$(IMPDIR)/core/thread.di \
diff --git a/src/core/math.d b/src/core/math.d
new file mode 100644
index 0000000000..b521f90fdd
--- /dev/null
+++ b/src/core/math.d
@@ -0,0 +1,147 @@
+// Written in the D programming language.
+
+/**
+ * Builtin mathematical intrinsics
+ *
+ * Source: $(DRUNTIMESRC core/_math.d)
+ * Macros:
+ *      TABLE_SV = <table border=1 cellpadding=4 cellspacing=0>
+ *              <caption>Special Values</caption>
+ *              $0</table>
+ *
+ *      NAN = $(RED NAN)
+ *      SUP = <span style="vertical-align:super;font-size:smaller">$0</span>
+ *      POWER = $1<sup>$2</sup>
+ *      PLUSMN = &plusmn;
+ *      INFIN = &infin;
+ *      PLUSMNINF = &plusmn;&infin;
+ *      LT = &lt;
+ *      GT = &gt;
+ *
+ * Copyright: Copyright Digital Mars 2000 - 2011.
+ * License:   <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>.
+ * Authors:   $(WEB digitalmars.com, Walter Bright),
+ *                        Don Clugston
+ */
+module core.math;
+
+version(LDC) {
+    public import ldc.intrinsics;
+}
+
+public:
+
+/***********************************
+ * Returns cosine of x. x is in radians.
+ *
+ *      $(TABLE_SV
+ *      $(TR $(TH x)                 $(TH cos(x)) $(TH invalid?))
+ *      $(TR $(TD $(NAN))            $(TD $(NAN)) $(TD yes)     )
+ *      $(TR $(TD $(PLUSMN)$(INFIN)) $(TD $(NAN)) $(TD yes)     )
+ *      )
+ * Bugs:
+ *      Results are undefined if |x| >= $(POWER 2,64).
+ */
+
+real cos(real x) @safe pure nothrow;       /* intrinsic */
+
+/***********************************
+ * Returns sine of x. x is in radians.
+ *
+ *      $(TABLE_SV
+ *      $(TR $(TH x)               $(TH sin(x))      $(TH invalid?))
+ *      $(TR $(TD $(NAN))          $(TD $(NAN))      $(TD yes))
+ *      $(TR $(TD $(PLUSMN)0.0)    $(TD $(PLUSMN)0.0) $(TD no))
+ *      $(TR $(TD $(PLUSMNINF))    $(TD $(NAN))      $(TD yes))
+ *      )
+ * Bugs:
+ *      Results are undefined if |x| >= $(POWER 2,64).
+ */
+
+real sin(real x) @safe pure nothrow;       /* intrinsic */
+
+/*****************************************
+ * Returns x rounded to a long value using the current rounding mode.
+ * If the integer value of x is
+ * greater than long.max, the result is
+ * indeterminate.
+ */
+long rndtol(real x) @safe pure nothrow;    /* intrinsic */
+
+
+/*****************************************
+ * Returns x rounded to a long value using the FE_TONEAREST rounding mode.
+ * If the integer value of x is
+ * greater than long.max, the result is
+ * indeterminate.
+ */
+extern (C) real rndtonl(real x);
+
+/***************************************
+ * Compute square root of x.
+ *
+ *      $(TABLE_SV
+ *      $(TR $(TH x)         $(TH sqrt(x))   $(TH invalid?))
+ *      $(TR $(TD -0.0)      $(TD -0.0)      $(TD no))
+ *      $(TR $(TD $(LT)0.0)  $(TD $(NAN))    $(TD yes))
+ *      $(TR $(TD +$(INFIN)) $(TD +$(INFIN)) $(TD no))
+ *      )
+ */
+
+@safe pure nothrow
+{
+    float sqrt(float x);    /* intrinsic */
+    double sqrt(double x);  /* intrinsic */ /// ditto
+    real sqrt(real x);      /* intrinsic */ /// ditto
+}
+
+/*******************************************
+ * Compute n * 2$(SUP exp)
+ * References: frexp
+ */
+
+real ldexp(real n, int exp) @safe pure nothrow;    /* intrinsic */
+
+unittest {
+    assert(ldexp(1, -16384) == 0x1p-16384L);
+    assert(ldexp(1, -16382) == 0x1p-16382L);
+}
+
+/*******************************
+ * Returns |x|
+ *
+ *      $(TABLE_SV
+ *      $(TR $(TH x)                 $(TH fabs(x)))
+ *      $(TR $(TD $(PLUSMN)0.0)      $(TD +0.0) )
+ *      $(TR $(TD $(PLUSMN)$(INFIN)) $(TD +$(INFIN)) )
+ *      )
+ */
+real fabs(real x) @safe pure nothrow;      /* intrinsic */
+
+/**********************************
+ * Rounds x to the nearest integer value, using the current rounding
+ * mode.
+ * If the return value is not equal to x, the FE_INEXACT
+ * exception is raised.
+ * $(B nearbyint) performs
+ * the same operation, but does not set the FE_INEXACT exception.
+ */
+real rint(real x) @safe pure nothrow;      /* intrinsic */
+
+/***********************************
+ * Building block functions, they
+ * translate to a single x87 instruction.
+ */
+
+real yl2x(real x, real y)   @safe pure nothrow;       // y * log2(x)
+real yl2xp1(real x, real y) @safe pure nothrow;       // y * log2(x + 1)
+
+unittest
+{
+    version (INLINE_YL2X)
+    {
+        assert(yl2x(1024, 1) == 10);
+        assert(yl2xp1(1023, 1) == 10);
+    }
+}
+
diff --git a/win32.mak b/win32.mak
index 854ba11c7b..065634a12e 100644
--- a/win32.mak
+++ b/win32.mak
@@ -34,6 +34,7 @@ MANIFEST= \
 	src\core\cpuid.d \
 	src\core\demangle.d \
 	src\core\exception.d \
+	src\core\math.d \
 	src\core\memory.d \
 	src\core\runtime.d \
 	src\core\thread.d \
@@ -224,6 +225,7 @@ SRCS= \
 	src\core\cpuid.d \
 	src\core\demangle.d \
 	src\core\exception.d \
+	src\core\math.d \
 	src\core\memory.d \
 	src\core\runtime.d \
 	src\core\thread.d \
@@ -349,6 +351,7 @@ DOCS=\
 	$(DOCDIR)\core_cpuid.html \
 	$(DOCDIR)\core_demangle.html \
 	$(DOCDIR)\core_exception.html \
+	$(DOCDIR)\core_math.html \
 	$(DOCDIR)\core_memory.html \
 	$(DOCDIR)\core_runtime.html \
 	$(DOCDIR)\core_thread.html \
@@ -369,6 +372,7 @@ IMPORTS=\
 	$(IMPDIR)\core\cpuid.di \
 	$(IMPDIR)\core\demangle.di \
 	$(IMPDIR)\core\exception.di \
+	$(IMPDIR)\core\math.di \
 	$(IMPDIR)\core\memory.di \
 	$(IMPDIR)\core\runtime.di \
 	$(IMPDIR)\core\thread.di \
@@ -475,6 +479,9 @@ $(DOCDIR)\core_demangle.html : src\core\demangle.d
 $(DOCDIR)\core_exception.html : src\core\exception.d
 	$(DMD) -c -d -o- -Isrc -Iimport -Df$@ $(DOCFMT) $**
 
+$(DOCDIR)\core_math.html : src\core\math.d
+	$(DMD) -c -d -o- -Isrc -Iimport -Df$@ $(DOCFMT) $**
+
 $(DOCDIR)\core_memory.html : src\core\memory.d
 	$(DMD) -c -d -o- -Isrc -Iimport -Df$@ $(DOCFMT) $**
 
@@ -530,6 +537,9 @@ $(IMPDIR)\core\demangle.di : src\core\demangle.d
 $(IMPDIR)\core\exception.di : src\core\exception.d
 	$(DMD) -c -d -o- -Isrc -Iimport -Hf$@ $**
 
+$(IMPDIR)\core\math.di : src\core\math.d
+	$(DMD) -c -d -o- -Isrc -Iimport -Hf$@ $**
+
 $(IMPDIR)\core\memory.di : src\core\memory.d
 	$(DMD) -c -d -o- -Isrc -Iimport -Hf$@ $**