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Fix lround() loses precision

This commit is contained in:
Paul Pluzhnikov 2011-09-08 23:37:32 -04:00 committed by Ulrich Drepper
parent 5f69cd2f94
commit 7f5517aa52
3 changed files with 8 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2011-08-18 Paul Pluzhnikov <ppluzhnikov@google.com>
Ian Lance Taylor <iant@google.com>
* math/libm-test.inc (lround_test): New testcase.
* sysdeps/ieee754/dbl-64/s_lround.c (__lround): Don't lose precision.
2011-09-08 Ulrich Drepper <drepper@gmail.com>
* Makefile: Remove support for automatic cvs check-ins.

1
math/libm-test.inc
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@ -4386,6 +4386,7 @@ lround_test (void)
TEST_f_l (lround, 1073741824.01, 1073741824);
# if LONG_MAX > 281474976710656
TEST_f_l (lround, 281474976710656.025, 281474976710656);
TEST_f_l (llround, -3.65309740835E17, -365309740835000000);
# endif
TEST_f_l (lround, 2097152.5, 2097153);
TEST_f_l (lround, -2097152.5, -2097153);

2
sysdeps/ieee754/dbl-64/s_lround.c
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@ -51,7 +51,7 @@ __lround (double x)
else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
{
if (j0 >= 52)
result = ((long int) i0 << (j0 - 20)) | (i1 << (j0 - 52));
result = ((long int) i0 << (j0 - 20)) | ((long int) i1 << (j0 - 52));
else
{
u_int32_t j = i1 + (0x80000000 >> (j0 - 20));