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Bug 864265 - Move integer exponent check from js_math_pow to ecmaPow. r=h4writer

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This commit is contained in:
Jan de Mooij 2013-04-22 12:19:19 +02:00
parent b68e1ed2f8
commit 39c97d978a
1 changed files with 9 additions and 10 deletions
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19
js/src/jsmath.cpp
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@ -469,6 +469,13 @@ js::powi(double x, int y)
double
js::ecmaPow(double x, double y)
{
/*
* Use powi if the exponent is an integer-valued double. We don't have to
* check for NaN since a comparison with NaN is always false.
*/
if (int32_t(y) == y)
return powi(x, int32_t(y));
/*
* Because C99 and ECMA specify different behavior for pow(),
* we need to wrap the libm call to make it ECMA compliant.
@ -491,7 +498,7 @@ js::ecmaPow(double x, double y)
JSBool
js_math_pow(JSContext *cx, unsigned argc, Value *vp)
{
double x, y, z;
double x, y;
if (argc <= 1) {
vp->setDouble(js_NaN);
@ -519,15 +526,7 @@ js_math_pow(JSContext *cx, unsigned argc, Value *vp)
return JS_TRUE;
}
/*
* Use powi if the exponent is an integer or an integer-valued double.
* We don't have to check for NaN since a comparison with NaN is always
* false.
*/
if (int32_t(y) == y)
z = powi(x, int32_t(y));
else
z = ecmaPow(x, y);
double z = ecmaPow(x, y);
vp->setNumber(z);
return JS_TRUE;