random: Implement getFloat_gamma() optimization

TimWolla · TimWolla · commit 31805d95b6a7 · 2022-12-09T17:52:59.000+01:00
see https://github.com/php/php-src/pull/9679/files#r994668327
diff --git a/ext/random/randomizer.c b/ext/random/randomizer.c
@@ -141,10 +141,7 @@ static double getFloat_gamma_high(double x)
 
 static double getFloat_gamma(double x, double y)
 {
-	double high = getFloat_gamma_high(x);
-	double low = getFloat_gamma_low(y);
-
-	return high > low ? high : low;
+	return (fabs(x) > fabs(y)) ? getFloat_gamma_high(x) : getFloat_gamma_low(y);
 }
 
 static uint64_t getFloat_ceilint(double a, double b, double g)

Original file line number	Diff line number	Diff line change
`@@ -141,10 +141,7 @@ static double getFloat_gamma_high(double x)`
`141`	`141`
`142`	`142`	`static double getFloat_gamma(double x, double y)`
`143`	`143`	`{`
`144`		`- double high = getFloat_gamma_high(x);`
`145`		`- double low = getFloat_gamma_low(y);`
`146`		`-`
`147`		`- return high > low ? high : low;`
	`144`	`+ return (fabs(x) > fabs(y)) ? getFloat_gamma_high(x) : getFloat_gamma_low(y);`
`148`	`145`	`}`
`149`	`146`
`150`	`147`	`static uint64_t getFloat_ceilint(double a, double b, double g)`