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PowerPC: fix hypot/hypof FP exceptions

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This patch fixes hypot/hypotf spurious floating-point exceptions
generate by internal operations.
This commit is contained in:
Adhemerval Zanella 2013-05-06 14:40:17 -05:00
parent d5e8275481
commit 16e616a72f
5 changed files with 25 additions and 17 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2013-05-06 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
[BZ #15418]
[BZ #15419]
* sysdeps/powerpc/fpu/e_hypot.c: Fix spurious FP exception generated by
internal tests.
* sysdeps/powerpc/fpu/e_hypotf.c: Likewise.
2013-05-06 Roland McGrath <roland@hack.frob.com>
* elf/dl-writev.h: New file.

2
NEWS
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@ -16,7 +16,7 @@ Version 2.18
15084, 15085, 15086, 15160, 15214, 15221, 15232, 15234, 15283, 15285,
15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335, 15336, 15337,
15342, 15346, 15361, 15366, 15380, 15394, 15405, 15406, 15409, 15416,
15423.
15418, 15419, 15423.
* CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
#15078).

2
math/libm-test.inc
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@ -9159,6 +9159,7 @@ hypot_test (void)
TEST_ff_f (hypot, 0.75L, 1.25L, 1.45773797371132511771853821938639577L);
TEST_ff_f (hypot, 1.0L, 0x1p-61L, 1.0L);
TEST_ff_f (hypot, 0x1p+0L, 0x1.fp-129L, 0x1p+0L);
#if defined TEST_LDOUBLE && LDBL_MANT_DIG >= 106
TEST_ff_f (hypot, 0x1.23456789abcdef0123456789ab8p-500L, 0x1.23456789abcdef0123456789ab8p-500L, 4.9155782399407039128612180934736799735113e-151L);
#endif
@ -9170,6 +9171,7 @@ hypot_test (void)
#if !defined TEST_FLOAT && !(defined TEST_DOUBLE && defined TEST_INLINE)
TEST_ff_f (hypot, 0x3p1021L, 0x4p1021L, 0x5p1021L);
TEST_ff_f (hypot, 0x1p+0L, 0x0.3ep-1022L, 0x1p+0L);
#endif
#if defined TEST_LDOUBLE && LDBL_MAX_EXP >= 16384 && !defined TEST_INLINE

16
sysdeps/powerpc/fpu/e_hypot.c
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@ -26,6 +26,7 @@ static const double two600 = 4.149515568880993e+180;
static const double two1022 = 4.49423283715579e+307;
static const double twoM500 = 3.054936363499605e-151;
static const double twoM600 = 2.4099198651028841e-181;
static const double two60factor = 1.5592502418239997e+290;
static const double pdnum = 2.225073858507201e-308;
/* __ieee754_hypot(x,y)
@ -87,9 +88,20 @@ __ieee754_hypot (double x, double y)
x = y;
y = t;
}
if (y == 0.0 || (x / y) > two60)
if (y == 0.0)
return x;
/* if y is higher enough, y * 2^60 might overflow. The tests if
y >= 1.7976931348623157e+308/2^60 (two60factor) and uses the
appropriate check to avoid the overflow exception generation. */
if (y > two60factor)
{
return x + y;
if ((x / y) > two60)
return x + y;
}
else
{
if (x > (y * two60))
return x + y;
}
if (x > two500)
{

14
sysdeps/powerpc/fpu/e_hypotf.c
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@ -69,22 +69,8 @@ static const float two30 = 1.0737418e09;
float
__ieee754_hypotf (float x, float y)
{
x = fabsf (x);
y = fabsf (y);
TEST_INF_NAN (x, y);
if (y > x)
{
float t = y;
y = x;
x = t;
}
if (y == 0.0 || (x / y) > two30)
{
return x + y;
}
return __ieee754_sqrt ((double) x * x + (double) y * y);
}
strong_alias (__ieee754_hypotf, __hypotf_finite)