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Bug 654664 - Optimize JSDOUBLE_IS_NEGZERO after bug 640494. r=jimb

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This commit is contained in:
Mike Hommey 2011-07-11 07:57:35 +02:00
parent ba8c0f0809
commit 962f3c6d46
1 changed files with 11 additions and 2 deletions
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13
js/src/jsvalue.h
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@ -92,16 +92,25 @@
#define JSDOUBLE_SIGNBIT (((uint64) 1) << 63)
#define JSDOUBLE_EXPMASK (((uint64) 0x7ff) << 52)
#define JSDOUBLE_MANTMASK ((((uint64) 1) << 52) - 1)
#define JSDOUBLE_HI32_SIGNBIT 0x80000000
static JS_ALWAYS_INLINE JSBool
JSDOUBLE_IS_NEGZERO(jsdouble d)
{
if (d != 0)
return false;
union {
struct {
#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
uint32 lo, hi;
#else
uint32 hi, lo;
#endif
} s;
jsdouble d;
uint64 bits;
} x;
x.d = d;
return x.bits == JSDOUBLE_SIGNBIT;
return (x.s.hi & JSDOUBLE_HI32_SIGNBIT) != 0;
}
static inline bool