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Bug 925123 - Add Math.clz32 builtin. r=till

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This commit is contained in:
Tom Schuster 2014-04-11 17:24:58 +02:00
parent ffc0950558
commit 7c5de09f23
3 changed files with 65 additions and 0 deletions
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24
js/src/jsmath.cpp
View File

@ -309,6 +309,29 @@ js::math_ceil(JSContext *cx, unsigned argc, Value *vp)
return true;
}
bool
js::math_clz32(JSContext *cx, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
if (args.length() == 0) {
args.rval().setInt32(32);
return true;
}
uint32_t n;
if (!ToUint32(cx, args[0], &n))
return false;
if (n == 0) {
args.rval().setInt32(32);
return true;
}
args.rval().setInt32(mozilla::CountLeadingZeroes32(n));
return true;
}
/*
* Fast sine and cosine approximation code, based on the sin [0] and cos [1]
* implementations [2] in the cephes library [3].
@ -1535,6 +1558,7 @@ static const JSFunctionSpec math_static_methods[] = {
JS_FN("atan", math_atan, 1, 0),
JS_FN("atan2", math_atan2, 2, 0),
JS_FN("ceil", math_ceil, 1, 0),
JS_FN("clz32", math_clz32, 1, 0),
JS_FN("cos", math_cos, 1, 0),
JS_FN("exp", math_exp, 1, 0),
JS_FN("floor", math_floor, 1, 0),

3
js/src/jsmath.h
View File

@ -247,6 +247,9 @@ math_ceil(JSContext *cx, unsigned argc, Value *vp);
extern double
math_ceil_impl(double x);
extern bool
math_clz32(JSContext *cx, unsigned argc, Value *vp);
extern bool
math_floor(JSContext *cx, unsigned argc, Value *vp);

38
js/src/tests/ecma_6/Math/clz32.js Normal file
View File

@ -0,0 +1,38 @@
// Undefined and NaN end up as zero after ToUint32
assertEq(Math.clz32(), 32);
assertEq(Math.clz32(NaN), 32);
assertEq(Math.clz32.call(), 32);
// 0
assertEq(Math.clz32(null), 32);
assertEq(Math.clz32(false), 32);
// 1
assertEq(Math.clz32(true), 31);
// 3
assertEq(Math.clz32(3.5), 30);
// NaN -> 0
assertEq(Math.clz32({}), 32);
// 2
assertEq(Math.clz32({valueOf: function() { return 2; }}), 30);
// 0 -> 0
assertEq(Math.clz32([]), 32);
assertEq(Math.clz32(""), 32);
// NaN -> 0
assertEq(Math.clz32([1, 2, 3]), 32);
assertEq(Math.clz32("bar"), 32);
// 15
assertEq(Math.clz32("15"), 28);
assertEq(Math.clz32(0x80000000), 0);
assertEq(Math.clz32(0xF0FF1000), 0);
assertEq(Math.clz32(0x7F8F0001), 1);
assertEq(Math.clz32(0x3FFF0100), 2);
assertEq(Math.clz32(0x1FF50010), 3);
assertEq(Math.clz32(0x00800000), 8);
assertEq(Math.clz32(0x00400000), 9);
assertEq(Math.clz32(0x00008000), 16);
assertEq(Math.clz32(0x00004000), 17);
assertEq(Math.clz32(0x00000080), 24);
assertEq(Math.clz32(0x00000040), 25);
assertEq(Math.clz32(0x00000001), 31);
assertEq(Math.clz32(0), 32);