wine/gecko
0
0
Fork 0
mirror of https://gitlab.winehq.org/wine/wine-gecko.git synced 2024-09-13 09:24:08 -07:00
Code Issues Packages Projects Releases Wiki Activity

Bug 913282: Add mfbt Float32 asserts and constants; r=Waldo

Browse Source
This commit is contained in:
Benjamin Bouvier 2013-09-20 12:08:49 -07:00
parent cb56082998
commit bcf0b47126
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
mfbt/FloatingPoint.h
View File

@ -58,6 +58,30 @@ static_assert((DoubleSignBit | DoubleExponentBits | DoubleSignificandBits) ==
~uint64_t(0),
"all bits accounted for");
/*
* Ditto for |float| that must be a 32-bit double format number type, compatible
* with the IEEE-754 standard.
*/
static_assert(sizeof(float) == sizeof(uint32_t), "float must be 32bits");
const unsigned FloatExponentBias = 127;
const unsigned FloatExponentShift = 23;
const uint32_t FloatSignBit = 0x80000000UL;
const uint32_t FloatExponentBits = 0x7F800000UL;
const uint32_t FloatSignificandBits = 0x007FFFFFUL;
static_assert((FloatSignBit & FloatExponentBits) == 0,
"sign bit doesn't overlap exponent bits");
static_assert((FloatSignBit & FloatSignificandBits) == 0,
"sign bit doesn't overlap significand bits");
static_assert((FloatExponentBits & FloatSignificandBits) == 0,
"exponent bits don't overlap significand bits");
static_assert((FloatSignBit | FloatExponentBits | FloatSignificandBits) ==
~uint32_t(0),
"all bits accounted for");
/** Determines whether a double is NaN. */
static MOZ_ALWAYS_INLINE bool
IsNaN(double d)