Adding some new functions to System.Math and System.MathF (#20788)

* Adding BitIncrement, BitDecrement, CopySign, MaxMagnitude, and MinMagnitude to Math and MathF

* Adding FusedMultiplyAdd, IlogB, Log2, and ScaleB to Math and MathF

* Adding some basic PAL tests for fma, ilogb, log2, and scalbn

* Fixing a couple typos and adding clarifying comments

* Fixing the MSVC _VVV FCALL declarations

4 files changed, 80 insertions, 0 deletions

diff --git a/src/classlibnative/float/floatdouble.cpp b/src/classlibnative/float/floatdouble.cpp
index b27ef61416..2e4b382460 100644
--- a/src/classlibnative/float/floatdouble.cpp
+++ b/src/classlibnative/float/floatdouble.cpp
@@ -200,6 +200,24 @@ FCIMPL2_VV(double, COMDouble::FMod, double x, double y)
     return (double)fmod(x, y);
 FCIMPLEND
 
+/*=====================================FusedMultiplyAdd==========================
+**
+==============================================================================*/
+FCIMPL3_VVV(double, COMDouble::FusedMultiplyAdd, double x, double y, double z)
+    FCALL_CONTRACT;
+
+    return (double)fma(x, y, z);
+FCIMPLEND
+
+/*=====================================Ilog2====================================
+**
+==============================================================================*/
+FCIMPL1_V(int, COMDouble::IlogB, double x)
+    FCALL_CONTRACT;
+
+    return (int)ilogb(x);
+FCIMPLEND
+
 /*=====================================Log======================================
 **
 ==============================================================================*/
@@ -209,6 +227,15 @@ FCIMPL1_V(double, COMDouble::Log, double x)
     return (double)log(x);
 FCIMPLEND
 
+/*=====================================Log2=====================================
+**
+==============================================================================*/
+FCIMPL1_V(double, COMDouble::Log2, double x)
+    FCALL_CONTRACT;
+
+    return (double)log2(x);
+FCIMPLEND
+
 /*====================================Log10=====================================
 **
 ==============================================================================*/
@@ -236,6 +263,15 @@ FCIMPL2_VV(double, COMDouble::Pow, double x, double y)
     return (double)pow(x, y);
 FCIMPLEND
 
+/*=====================================ScaleB===================================
+**
+==============================================================================*/
+FCIMPL2_VI(double, COMDouble::ScaleB, double x, int n)
+    FCALL_CONTRACT;
+
+    return (double)scalbn(x, n);
+FCIMPLEND
+
 /*=====================================Sin======================================
 **
 ==============================================================================*/
diff --git a/src/classlibnative/float/floatsingle.cpp b/src/classlibnative/float/floatsingle.cpp
index 3903bc9cd3..23c1445e43 100644
--- a/src/classlibnative/float/floatsingle.cpp
+++ b/src/classlibnative/float/floatsingle.cpp
@@ -187,6 +187,24 @@ FCIMPL2_VV(float, COMSingle::FMod, float x, float y)
     return (float)fmodf(x, y);
 FCIMPLEND
 
+/*=====================================FusedMultiplyAdd==========================
+**
+==============================================================================*/
+FCIMPL3_VVV(float, COMSingle::FusedMultiplyAdd, float x, float y, float z)
+    FCALL_CONTRACT;
+
+    return (float)fmaf(x, y, z);
+FCIMPLEND
+
+/*=====================================Ilog2====================================
+**
+==============================================================================*/
+FCIMPL1_V(int, COMSingle::IlogB, float x)
+    FCALL_CONTRACT;
+
+    return (int)ilogbf(x);
+FCIMPLEND
+
 /*=====================================Log======================================
 **
 ==============================================================================*/
@@ -196,6 +214,15 @@ FCIMPL1_V(float, COMSingle::Log, float x)
     return (float)logf(x);
 FCIMPLEND
 
+/*=====================================Log2=====================================
+**
+==============================================================================*/
+FCIMPL1_V(float, COMSingle::Log2, float x)
+    FCALL_CONTRACT;
+
+    return (float)log2f(x);
+FCIMPLEND
+
 /*====================================Log10=====================================
 **
 ==============================================================================*/
@@ -223,6 +250,15 @@ FCIMPL2_VV(float, COMSingle::Pow, float x, float y)
     return (float)powf(x, y);
 FCIMPLEND
 
+/*=====================================ScaleB===================================
+**
+==============================================================================*/
+FCIMPL2_VI(float, COMSingle::ScaleB, float x, int n)
+    FCALL_CONTRACT;
+
+    return (float)scalbnf(x, n);
+FCIMPLEND
+
 /*=====================================Sin======================================
 **
 ==============================================================================*/
diff --git a/src/classlibnative/inc/floatdouble.h b/src/classlibnative/inc/floatdouble.h
index d2c819f544..602b45b2f8 100644
--- a/src/classlibnative/inc/floatdouble.h
+++ b/src/classlibnative/inc/floatdouble.h
@@ -25,10 +25,14 @@ public:
     FCDECL1_V(static double, Exp, double x);
     FCDECL1_V(static double, Floor, double x);
     FCDECL2_VV(static double, FMod, double x, double y);
+    FCDECL3_VVV(static double, FusedMultiplyAdd, double x, double y, double z);
+    FCDECL1_V(static int, IlogB, double x);
     FCDECL1_V(static double, Log, double x);
+    FCDECL1_V(static double, Log2, double x);
     FCDECL1_V(static double, Log10, double x);
     FCDECL2_VI(static double, ModF, double x, double* intptr);
     FCDECL2_VV(static double, Pow, double x, double y);
+    FCDECL2_VI(static double, ScaleB, double x, int n);
     FCDECL1_V(static double, Sin, double x);
     FCDECL1_V(static double, Sinh, double x);
     FCDECL1_V(static double, Sqrt, double x);
diff --git a/src/classlibnative/inc/floatsingle.h b/src/classlibnative/inc/floatsingle.h
index a4f9cb73df..f54a65028a 100644
--- a/src/classlibnative/inc/floatsingle.h
+++ b/src/classlibnative/inc/floatsingle.h
@@ -25,10 +25,14 @@ public:
     FCDECL1_V(static float, Exp, float x);
     FCDECL1_V(static float, Floor, float x);
     FCDECL2_VV(static float, FMod, float x, float y);
+    FCDECL3_VVV(static float, FusedMultiplyAdd, float x, float y, float z);
+    FCDECL1_V(static int, IlogB, float x);
     FCDECL1_V(static float, Log, float x);
+    FCDECL1_V(static float, Log2, float x);
     FCDECL1_V(static float, Log10, float x);
     FCDECL2_VI(static float, ModF, float x, float* intptr);
     FCDECL2_VV(static float, Pow, float x, float y);
+    FCDECL2_VI(static float, ScaleB, float x, int n);
     FCDECL1_V(static float, Sin, float x);
     FCDECL1_V(static float, Sinh, float x);
     FCDECL1_V(static float, Sqrt, float x);