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Bug 383607: add ARM pure endian double support to JS engine, r=crowder, patch by Gavin Reaney gavin@picsel.com

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This commit is contained in:
crowder@fiverocks.com 2007-06-18 14:31:48 -07:00
parent c949ed9ff3
commit d1f64c8dba
1 changed files with 8 additions and 8 deletions
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16
js/src/jsnum.h
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@ -51,19 +51,19 @@
JS_BEGIN_EXTERN_C
/*
* Stefan Hanske <sh990154@mail.uni-greifswald.de> reports:
* ARM is a little endian architecture but 64 bit double words are stored
* differently: the 32 bit words are in little endian byte order, the two words
* are stored in big endian`s way.
* The ARM architecture supports two floating point models: VFP and FPA. When
* targetting FPA, doubles are mixed-endian on little endian ARMs (meaning that
* the high and low words are in big endian order).
*/
#if defined(__arm) || defined(__arm32__) || defined(__arm26__) || defined(__arm__)
#define CPU_IS_ARM
#if !defined(__VFP_FP__)
#define FPU_IS_ARM_FPA
#endif
#endif
typedef union jsdpun {
struct {
#if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
uint32 lo, hi;
#else
uint32 hi, lo;
@ -92,7 +92,7 @@ typedef union jsdpun {
* so this code should work.
*/
#if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
#define JSDOUBLE_HI32(x) (((uint32 *)&(x))[1])
#define JSDOUBLE_LO32(x) (((uint32 *)&(x))[0])
#else