shithub: npe

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leave fpu flags alone; more precise/portable versions of log2/exp2

--- a/libnpe/_main.c

+++ b/libnpe/_main.c

@@ -15,8 +15,6 @@

 void

 threadmain(int argc, char *argv[])

 {

-	setfcr(getfcr() & ~(FPINVAL|FPOVFL));

-

 	exit = npe_threadexit;

 	argv0 = *argv; /* for sdl to set at least some kind of label */

--- a/libnpe/_npe.h

+++ b/libnpe/_npe.h

@@ -1,3 +1,2 @@

-#define ln2o1 1.4426950408889634073599

 #define hugeF 3.4028234e+38

 #define hugeD 1.79769313486231e+308

--- a/libnpe/exp2.c

+++ b/libnpe/exp2.c

@@ -4,5 +4,8 @@

 double

 exp2(double x)

 {

-	return exp(x/ln2o1);

+	static double ln2c = 0.0;

+	if(ln2c == 0.0)

+		ln2c = log(2.0);

+	return exp(x*ln2c);

 }

--- a/libnpe/log2.c

+++ b/libnpe/log2.c

@@ -4,12 +4,15 @@

 double

 log2(double x)

 {

+	static double ln2c = 0.0;

 	if(x == 0)

 		return -hugeD;

 	if(x < 0 || isNaN(x))

 		return NaN();

+	if(ln2c == 0.0)

+		ln2c = log(2.0);

-	return log(x)*ln2o1;

+	return log(x)/ln2c;

 }

 float

--- a/libnpe_sdl2/audio.c

+++ b/libnpe_sdl2/audio.c

@@ -201,7 +201,6 @@

 			dup(p[0], rec ? 1 : 0); close(p[0]);

 			close(p[1]);

 			//close(2);

-			setfcr(FPPDBL|FPRNR|FPINVAL|FPZDIV|FPOVFL);

 			if(execl("/bin/audio/pcmconv", "pcmconv", rec ? "-o" : "-i", spec, nil) != 0)

 				exits("%r");

 		}else if(a->pidconv < 0){