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Fix signed integer division in ARM runtime ABI

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- fix computation of absolute value (clearing the sign bit does not
  since integers are encoded in 2's complement)
- test sign of integer in a more conventional way (binary and with the
  high bit does not work for long long due to a bug in gtst)
- spacing in include
This commit is contained in:
Thomas Preud'homme 2013-12-15 09:44:20 +08:00
parent f2dbcf7594
commit a24e31e85d
1 changed files with 21 additions and 9 deletions
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30
lib/armeabi.c
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@ -1,4 +1,4 @@
#include<limits.h>
#include <limits.h>
/* We rely on the little endianness and EABI calling convention for this to
work */
@ -325,22 +325,28 @@ static inline rettype aeabi_ ## name (type num, type den) \
}
#define __AEABI_XDIVMOD(name, type, uiname, rettype, urettype, typemacro) \
void __aeabi_ ## name(type numerator, type denominator) \
void __aeabi_ ## name(type numerator, type denominator) \
{ \
unsigned type num, den; \
urettype uxdiv_ret; \
rettype ret; \
\
num = numerator & typemacro ## _MAX; \
den = denominator & typemacro ## _MAX; \
if (numerator >= 0) \
num = numerator; \
else \
num = 0 - numerator; \
if (denominator >= 0) \
den = denominator; \
else \
den = 0 - denominator; \
uxdiv_ret = aeabi_ ## uiname(num, den); \
/* signs differ */ \
if ((numerator & typemacro ## _MIN) != (denominator & typemacro ## _MIN)) \
ret.quot = uxdiv_ret.quot * -1; \
ret.quot = 0 - uxdiv_ret.quot; \
else \
ret.quot = uxdiv_ret.quot; \
if (numerator & typemacro ## _MIN) \
ret.rem = uxdiv_ret.rem * -1; \
if (numerator < 0) \
ret.rem = 0 - uxdiv_ret.rem; \
else \
ret.rem = uxdiv_ret.rem; \
\
@ -420,8 +426,14 @@ int __aeabi_idiv(int numerator, int denominator)
unsigned num, den;
uidiv_t ret;
num = numerator & INT_MAX;
den = denominator & INT_MAX;
if (numerator >= 0)
num = numerator;
else
num = 0 - numerator;
if (denominator >= 0)
den = denominator;
else
den = 0 - denominator;
ret = aeabi_uidivmod(num, den);
if ((numerator & INT_MIN) != (denominator & INT_MIN)) /* signs differ */
ret.quot *= -1;