SDL_log10

CMakeLists.txt

@@ -643,7 +643,7 @@ if(LIBC)
             _stricmp _strnicmp sscanf
             acos acosf asin asinf atan atanf atan2 atan2f ceil ceilf
             copysign copysignf cos cosf fabs fabsf floor floorf fmod fmodf
-            log logf pow powf scalbn scalbnf sin sinf sqrt sqrtf tan tanf)
+            log logf log10 log10f pow powf scalbn scalbnf sin sinf sqrt sqrtf tan tanf)
       string(TOUPPER ${_FN} _UPPER)
       set(HAVE_${_UPPER} 1)
     endforeach()

VisualC/SDL/SDL.vcxproj

@@ -420,6 +420,7 @@
     <ClCompile Include="..\..\src\libm\e_atan2.c" />
     <ClCompile Include="..\..\src\libm\e_fmod.c" />
     <ClCompile Include="..\..\src\libm\e_log.c" />
+    <ClCompile Include="..\..\src\libm\e_log10.c" />
     <ClCompile Include="..\..\src\libm\e_pow.c" />
     <ClCompile Include="..\..\src\libm\e_rem_pio2.c" />
     <ClCompile Include="..\..\src\libm\e_sqrt.c" />

VisualC/SDL/SDL.vcxproj.filters

@@ -317,6 +317,7 @@
   <ItemGroup>
     <ClCompile Include="..\..\src\libm\e_atan2.c" />
     <ClCompile Include="..\..\src\libm\e_log.c" />
+    <ClCompile Include="..\..\src\libm\e_log10.c" />
     <ClCompile Include="..\..\src\libm\e_pow.c" />
     <ClCompile Include="..\..\src\libm\e_rem_pio2.c" />
     <ClCompile Include="..\..\src\libm\e_sqrt.c" />

configure

@@ -16690,7 +16690,7 @@ if test "x$ac_cv_lib_m_pow" = xyes; then :
   LIBS="$LIBS -lm"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"
 fi
 
-    for ac_func in acos acosf asin asinf atan atanf atan2 atan2f ceil ceilf copysign copysignf cos cosf fabs fabsf floor floorf fmod fmodf log logf pow powf scalbn scalbnf sin sinf sqrt sqrtf tan tanf
+    for ac_func in acos acosf asin asinf atan atanf atan2 atan2f ceil ceilf copysign copysignf cos cosf fabs fabsf floor floorf fmod fmodf log logf log10 log10f pow powf scalbn scalbnf sin sinf sqrt sqrtf tan tanf
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"

configure.in

@@ -271,7 +271,7 @@ if test x$enable_libc = xyes; then
     AC_CHECK_FUNCS(malloc calloc realloc free getenv setenv putenv unsetenv qsort abs bcopy memset memcpy memmove wcslen wcscmp strlen strlcpy strlcat _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa _uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp vsscanf vsnprintf fopen64 fseeko fseeko64 sigaction setjmp nanosleep sysconf sysctlbyname getauxval poll)
 
     AC_CHECK_LIB(m, pow, [LIBS="$LIBS -lm"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"])
-    AC_CHECK_FUNCS(acos acosf asin asinf atan atanf atan2 atan2f ceil ceilf copysign copysignf cos cosf fabs fabsf floor floorf fmod fmodf log logf pow powf scalbn scalbnf sin sinf sqrt sqrtf tan tanf)
+    AC_CHECK_FUNCS(acos acosf asin asinf atan atanf atan2 atan2f ceil ceilf copysign copysignf cos cosf fabs fabsf floor floorf fmod fmodf log logf log10 log10f pow powf scalbn scalbnf sin sinf sqrt sqrtf tan tanf)
 
     AC_CHECK_LIB(iconv, iconv_open, [LIBS="$LIBS -liconv"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -liconv"])
     AC_CHECK_FUNCS(iconv)

include/SDL_config.h.cmake

@@ -152,6 +152,8 @@
 #cmakedefine HAVE_FMODF 1
 #cmakedefine HAVE_LOG 1
 #cmakedefine HAVE_LOGF 1
+#cmakedefine HAVE_LOG10 1
+#cmakedefine HAVE_LOG10F 1
 #cmakedefine HAVE_POW 1
 #cmakedefine HAVE_POWF 1
 #cmakedefine HAVE_SCALBN 1

include/SDL_config.h.in

@@ -157,6 +157,8 @@
 #undef HAVE_FMODF
 #undef HAVE_LOG
 #undef HAVE_LOGF
+#undef HAVE_LOG10
+#undef HAVE_LOG10F
 #undef HAVE_POW
 #undef HAVE_POWF
 #undef HAVE_SCALBN

include/SDL_config_android.h

@@ -106,6 +106,8 @@
 #define HAVE_FMODF  1
 #define HAVE_LOG    1
 #define HAVE_LOGF   1
+#define HAVE_LOG10  1
+#define HAVE_LOG10F 1
 #define HAVE_POW    1
 #define HAVE_POWF   1
 #define HAVE_SCALBN 1

include/SDL_config_iphoneos.h

@@ -107,6 +107,8 @@
 #define HAVE_FMODF  1
 #define HAVE_LOG    1
 #define HAVE_LOGF   1
+#define HAVE_LOG10  1
+#define HAVE_LOG10F 1
 #define HAVE_POW    1
 #define HAVE_POWF   1
 #define HAVE_SCALBN 1

include/SDL_config_macosx.h

@@ -110,6 +110,8 @@
 #define HAVE_FMODF  1
 #define HAVE_LOG    1
 #define HAVE_LOGF   1
+#define HAVE_LOG10  1
+#define HAVE_LOG10F 1
 #define HAVE_POW    1
 #define HAVE_POWF   1
 #define HAVE_SCALBN 1

include/SDL_config_pandora.h

@@ -93,6 +93,7 @@
 #define HAVE_FABS 1
 #define HAVE_FLOOR 1
 #define HAVE_LOG 1
+#define HAVE_LOG10 1
 #define HAVE_SCALBN 1
 #define HAVE_SIN 1
 #define HAVE_SINF 1

include/SDL_config_psp.h

@@ -105,6 +105,8 @@
 #define HAVE_FMODF  1
 #define HAVE_LOG    1
 #define HAVE_LOGF   1
+#define HAVE_LOG10  1
+#define HAVE_LOG10F 1
 #define HAVE_POW    1
 #define HAVE_POWF   1
 #define HAVE_SCALBN 1

include/SDL_config_windows.h

@@ -147,6 +147,8 @@ typedef unsigned int uintptr_t;
 #define HAVE_FMODF  1
 #define HAVE_LOG    1
 #define HAVE_LOGF   1
+#define HAVE_LOG10  1
+#define HAVE_LOG10F 1
 #define HAVE_POW    1
 #define HAVE_POWF   1
 #define HAVE_SIN    1

include/SDL_config_winrt.h

@@ -163,6 +163,8 @@ typedef unsigned int uintptr_t;
 #define HAVE_FMODF  1
 #define HAVE_LOG    1
 #define HAVE_LOGF   1
+#define HAVE_LOG10  1
+#define HAVE_LOG10F 1
 #define HAVE_POW    1
 #define HAVE_POWF   1
 #define HAVE__SCALB 1

include/SDL_config_wiz.h

@@ -102,6 +102,8 @@
 #define HAVE_FMODF  1
 #define HAVE_LOG    1
 #define HAVE_LOGF   1
+#define HAVE_LOG10  1
+#define HAVE_LOG10F 1
 #define HAVE_POW    1
 #define HAVE_POWF   1
 #define HAVE_SCALBN 1

src/libm/e_log10.c

@@ -0,0 +1,106 @@
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#if defined(_MSC_VER)           /* Handle Microsoft VC++ compiler specifics. */
+/* C4723: potential divide by zero. */
+#pragma warning ( disable : 4723 )
+#endif
+
+/* __ieee754_log10(x)
+ * Return the base 10 logarithm of x
+ *
+ * Method :
+ *	Let log10_2hi = leading 40 bits of log10(2) and
+ *	    log10_2lo = log10(2) - log10_2hi,
+ *	    ivln10   = 1/log(10) rounded.
+ *	Then
+ *		n = ilogb(x),
+ *		if(n<0)  n = n+1;
+ *		x = scalbn(x,-n);
+ *		log10(x) := n*log10_2hi + (n*log10_2lo + ivln10*log(x))
+ *
+ * Note 1:
+ *	To guarantee log10(10**n)=n, where 10**n is normal, the rounding
+ *	mode must set to Round-to-Nearest.
+ * Note 2:
+ *	[1/log(10)] rounded to 53 bits has error  .198   ulps;
+ *	log10 is monotonic at all binary break points.
+ *
+ * Special cases:
+ *	log10(x) is NaN with signal if x < 0;
+ *	log10(+INF) is +INF with no signal; log10(0) is -INF with signal;
+ *	log10(NaN) is that NaN with no signal;
+ *	log10(10**N) = N  for N=0,1,...,22.
+ *
+ * Constants:
+ * The hexadecimal values are the intended ones for the following constants.
+ * The decimal values may be used, provided that the compiler will convert
+ * from decimal to binary accurately enough to produce the hexadecimal values
+ * shown.
+ */
+
+#include "math_libm.h"
+#include "math_private.h"
+
+static const double
+two54      =  1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
+ivln10     =  4.34294481903251816668e-01, /* 0x3FDBCB7B, 0x1526E50E */
+log10_2hi  =  3.01029995663611771306e-01, /* 0x3FD34413, 0x509F6000 */
+log10_2lo  =  3.69423907715893078616e-13; /* 0x3D59FEF3, 0x11F12B36 */
+
+static const double zero = 0.0;
+
+double attribute_hidden __ieee754_log10(double x)
+{
+	double y,z;
+	int32_t i,k,hx;
+	u_int32_t lx;
+
+	EXTRACT_WORDS(hx,lx,x);
+
+        k=0;
+        if (hx < 0x00100000) {                  /* x < 2**-1022  */
+            if (((hx&0x7fffffff)|lx)==0)
+                return -two54/zero;             /* log(+-0)=-inf */
+            if (hx<0) return (x-x)/zero;        /* log(-#) = NaN */
+            k -= 54; x *= two54; /* subnormal number, scale up x */
+	    GET_HIGH_WORD(hx,x);
+        }
+	if (hx >= 0x7ff00000) return x+x;
+	k += (hx>>20)-1023;
+	i  = ((u_int32_t)k&0x80000000)>>31;
+        hx = (hx&0x000fffff)|((0x3ff-i)<<20);
+        y  = (double)(k+i);
+	SET_HIGH_WORD(x,hx);
+	z  = y*log10_2lo + ivln10*__ieee754_log(x);
+	return  z+y*log10_2hi;
+}
+
+/*
+ * wrapper log10(X)
+ */
+#ifndef _IEEE_LIBM
+double log10(double x)
+{
+	double z = __ieee754_log10(x);
+	if (_LIB_VERSION == _IEEE_ || isnan(x))
+		return z;
+	if (x <= 0.0) {
+		if(x == 0.0)
+			return __kernel_standard(x, x, 18); /* log10(0) */
+		return __kernel_standard(x, x, 19); /* log10(x<0) */
+	}
+	return z;
+}
+#else
+strong_alias(__ieee754_log10, log10)
+#endif
+libm_hidden_def(log10)

src/libm/math_libm.h

@@ -30,6 +30,7 @@ double SDL_uclibc_fabs(double x);
 double SDL_uclibc_floor(double x);
 double SDL_uclibc_fmod(double x, double y);
 double SDL_uclibc_log(double x);
+double SDL_uclibc_log10(double x);
 double SDL_uclibc_pow(double x, double y);    
 double SDL_uclibc_scalbn(double x, int n);
 double SDL_uclibc_sin(double x);

src/libm/math_private.h

@@ -39,6 +39,7 @@ typedef unsigned int u_int32_t;
 #define floor           SDL_uclibc_floor
 #define __ieee754_fmod  SDL_uclibc_fmod
 #define __ieee754_log   SDL_uclibc_log
+#define __ieee754_log10 SDL_uclibc_log10
 #define __ieee754_pow   SDL_uclibc_pow
 #define scalbln         SDL_uclibc_scalbln
 #define scalbn          SDL_uclibc_scalbn

src/stdlib/SDL_stdlib.c

@@ -280,6 +280,26 @@ SDL_logf(float x)
 #endif
 }
 
+double
+SDL_log10(double x)
+{
+#if defined(HAVE_LOG10)
+    return log10(x);
+#else
+    return SDL_uclibc_log10(x);
+#endif
+}
+
+float
+SDL_log10f(float x)
+{
+#if defined(HAVE_LOG10F)
+    return log10f(x);
+#else
+    return (float)SDL_log10((double)x);
+#endif
+}
+
 double
 SDL_pow(double x, double y)
 {