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Bug 289394 - "Double.cpp causes unaligned accesses" [p=davidm@hpl.hp.com (David Mosberger) / eric@debian.org (Eric Dorland) / mh+mozilla@glandium.org (Mike Hommey) r+sr=sicking sr=bryner a1.9=beltzner]

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This commit is contained in:
reed@reedloden.com 2008-01-25 00:02:04 -08:00
parent 64aa8e3a97
commit 1ca961cdad
2 changed files with 18 additions and 19 deletions
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21
content/xslt/public/txDouble.h
View File

@ -68,14 +68,7 @@ static fp_except_t oldmask = fpsetmask(~allmask);
#endif
#endif
#if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2
/**
* This version of the macros is safe for the alias optimizations
* that gcc does, but uses gcc-specific extensions.
*/
typedef union txdpun {
PRFloat64 d;
struct {
#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
PRUint32 lo, hi;
@ -83,8 +76,14 @@ typedef union txdpun {
PRUint32 hi, lo;
#endif
} s;
PRFloat64 d;
} txdpun;
#if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2
/**
* This version of the macros is safe for the alias optimizations
* that gcc does, but uses gcc-specific extensions.
*/
#define TX_DOUBLE_HI32(x) (__extension__ ({ txdpun u; u.d = (x); u.s.hi; }))
#define TX_DOUBLE_LO32(x) (__extension__ ({ txdpun u; u.d = (x); u.s.lo; }))
@ -113,11 +112,11 @@ typedef union txdpun {
(TX_DOUBLE_LO32(x) || (TX_DOUBLE_HI32(x) & TX_DOUBLE_HI32_MANTMASK)))
#ifdef IS_BIG_ENDIAN
#define TX_DOUBLE_NaN {TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_MANTMASK, \
0xffffffff}
#define TX_DOUBLE_NaN {{TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_MANTMASK, \
0xffffffff}}
#else
#define TX_DOUBLE_NaN {0xffffffff, \
TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_MANTMASK}
#define TX_DOUBLE_NaN {{0xffffffff, \
TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_MANTMASK}}
#endif
#if defined(XP_WIN)

16
content/xslt/src/base/txDouble.cpp
View File

@ -50,18 +50,18 @@
*/
//-- Initialize Double related constants
const PRUint32 nanMask[2] = TX_DOUBLE_NaN;
const txdpun nanMask = TX_DOUBLE_NaN;
#ifdef IS_BIG_ENDIAN
const PRUint32 infMask[2] = {TX_DOUBLE_HI32_EXPMASK, 0};
const PRUint32 negInfMask[2] = {TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_SIGNBIT, 0};
const txdpun infMask = {{TX_DOUBLE_HI32_EXPMASK, 0}};
const txdpun negInfMask = {{TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_SIGNBIT, 0}};
#else
const PRUint32 infMask[2] = {0, TX_DOUBLE_HI32_EXPMASK};
const PRUint32 negInfMask[2] = {0, TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_SIGNBIT};
const txdpun infMask = {{0, TX_DOUBLE_HI32_EXPMASK}};
const txdpun negInfMask = {{0, TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_SIGNBIT}};
#endif
const double Double::NaN = *((double*)nanMask);
const double Double::POSITIVE_INFINITY = *((double*)infMask);
const double Double::NEGATIVE_INFINITY = *((double*)negInfMask);
const double Double::NaN = nanMask.d;
const double Double::POSITIVE_INFINITY = infMask.d;
const double Double::NEGATIVE_INFINITY = negInfMask.d;
/*
* Determines whether the given double represents positive or negative