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Take ARM big-endian floating point numbers into account in FastD2UI.

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Review URL: http://codereview.chromium.org/996004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4144 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
lrn@chromium.org 2010-03-16 12:20:52 +00:00
parent 4669473a7b
commit b2b2eb5792
1 changed files with 9 additions and 2 deletions
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11
src/conversions-inl.h
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@ -60,7 +60,8 @@ static inline int FastD2I(double x) {
// The fast double-to-unsigned-int conversion routine does not guarantee
// rounding towards zero.
// rounding towards zero, or any reasonable value if the argument is larger
// than what fits in an unsigned 32-bit integer.
static inline unsigned int FastD2UI(double x) {
// There is no unsigned version of lrint, so there is no fast path
// in this function as there is in FastD2I. Using lrint doesn't work
@ -77,7 +78,13 @@ static inline unsigned int FastD2UI(double x) {
if (x < k2Pow52) {
x += k2Pow52;
uint32_t result;
memcpy(&result, &x, sizeof(result)); // Copy low 32 bits.
#ifdef BIG_ENDIAN_FLOATING_POINT
Address mantissa_ptr = reinterpret_cast<Address>(&x) + kIntSize;
#else
Address mantissa_ptr = reinterpret_cast<Address>(&x);
#endif
// Copy least significant 32 bits of mantissa.
memcpy(&result, mantissa_ptr, sizeof(result));
return negative ? ~result + 1 : result;
}
// Large number (outside uint32 range), Infinity or NaN.