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authorJoseph Myers <joseph@codesourcery.com>2016-06-14 16:04:19 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-06-14 16:04:19 +0000
commitf4015c8a861803c128112ca41fc62817398bd1c0 (patch)
tree9feb85605a2ac6ef767caba8f4bebe8b5882575c /math
parent4fea2cda618de1c74959aaec79c020993c34c552 (diff)
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Use generic fdim on more architectures (bug 6796, bug 20255, bug 20256).
Some architectures have their own versions of fdim functions, which are missing errno setting (bug 6796) and may also return sNaN instead of qNaN for sNaN input, in the case of the x86 / x86_64 long double versions (bug 20256). These versions are not actually doing anything that a compiler couldn't generate, just straightforward comparisons / arithmetic (and, in the x86 / x86_64 case, testing for NaNs with fxam, which isn't actually needed once you use an unordered comparison and let the NaNs pass through the same subtraction as non-NaN inputs). This patch removes the x86 / x86_64 / powerpc versions, so that those architectures use the generic C versions, which correctly handle setting errno and deal properly with sNaN inputs. This seems better than dealing with setting errno in lots of .S versions. The i386 versions also return results with excess range and precision, which is not appropriate for a function exactly defined by reference to IEEE operations. For errno setting to work correctly on overflow, it's necessary to remove excess range with math_narrow_eval, which this patch duly does in the float and double versions so that the tests can reliably pass on x86. For float, this avoids any double rounding issues as the long double precision is more than twice that of float. For double, double rounding issues will need to be addressed separately, so this patch does not fully fix bug 20255. Tested for x86_64, x86 and powerpc. [BZ #6796] [BZ #20255] [BZ #20256] * math/s_fdim.c: Include <math_private.h>. (__fdim): Use math_narrow_eval on result. * math/s_fdimf.c: Include <math_private.h>. (__fdimf): Use math_narrow_eval on result. * sysdeps/i386/fpu/s_fdim.S: Remove file. * sysdeps/i386/fpu/s_fdimf.S: Likewise. * sysdeps/i386/fpu/s_fdiml.S: Likewise. * sysdeps/i386/i686/fpu/s_fdim.S: Likewise. * sysdeps/i386/i686/fpu/s_fdimf.S: Likewise. * sysdeps/i386/i686/fpu/s_fdiml.S: Likewise. * sysdeps/powerpc/fpu/s_fdim.c: Likewise. * sysdeps/powerpc/fpu/s_fdimf.c: Likewise. * sysdeps/powerpc/powerpc32/fpu/s_fdim.c: Likewise. * sysdeps/powerpc/powerpc64/fpu/s_fdim.c: Likewise. * sysdeps/x86_64/fpu/s_fdiml.S: Likewise. * math/libm-test.inc (fdim_test_data): Expect errno setting on overflow. Add sNaN tests.
Diffstat (limited to 'math')
-rw-r--r--math/libm-test.inc35
-rw-r--r--math/s_fdim.c3
-rw-r--r--math/s_fdimf.c3
3 files changed, 37 insertions, 4 deletions
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 010743f..cc41c63 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -7211,8 +7211,7 @@ static const struct test_ff_f_data fdim_test_data[] =
TEST_ff_f (fdim, max_value, max_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -max_value, -max_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -max_value, max_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
- /* Bug 6796: errno setting may be missing. */
- TEST_ff_f (fdim, max_value, -max_value, plus_oflow, INEXACT_EXCEPTION|OVERFLOW_EXCEPTION),
+ TEST_ff_f (fdim, max_value, -max_value, plus_oflow, INEXACT_EXCEPTION|OVERFLOW_EXCEPTION|ERRNO_PLUS_OFLOW),
TEST_ff_f (fdim, plus_infty, 9, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, plus_infty, -9, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
@@ -7229,24 +7228,56 @@ static const struct test_ff_f_data fdim_test_data[] =
TEST_ff_f (fdim, 0, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, 9, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -9, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+ TEST_ff_f (fdim, 0, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, 9, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -9, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, 0, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, 9, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -9, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ff_f (fdim, qnan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, qnan_value, 9, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, qnan_value, -9, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -qnan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -qnan_value, 9, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -qnan_value, -9, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+ TEST_ff_f (fdim, snan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, snan_value, 9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, snan_value, -9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, 9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, -9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ff_f (fdim, plus_infty, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, minus_infty, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, plus_infty, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, minus_infty, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+ TEST_ff_f (fdim, plus_infty, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, minus_infty, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, plus_infty, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, minus_infty, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ff_f (fdim, qnan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, qnan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -qnan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -qnan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+ TEST_ff_f (fdim, snan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, snan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ff_f (fdim, qnan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, qnan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -qnan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, -qnan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+ TEST_ff_f (fdim, snan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, snan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, qnan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, qnan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -qnan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -qnan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, snan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, snan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
+ TEST_ff_f (fdim, -snan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
TEST_ff_f (fdim, plus_infty, plus_infty, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_ff_f (fdim, plus_infty, minus_infty, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
diff --git a/math/s_fdim.c b/math/s_fdim.c
index 8789ca4..a051ed8 100644
--- a/math/s_fdim.c
+++ b/math/s_fdim.c
@@ -19,6 +19,7 @@
#include <errno.h>
#include <math.h>
+#include <math_private.h>
double
__fdim (double x, double y)
@@ -26,7 +27,7 @@ __fdim (double x, double y)
if (islessequal (x, y))
return 0.0;
- double r = x - y;
+ double r = math_narrow_eval (x - y);
if (isinf (r) && !isinf (x) && !isinf (y))
__set_errno (ERANGE);
diff --git a/math/s_fdimf.c b/math/s_fdimf.c
index 2e8eccf..8aed61d 100644
--- a/math/s_fdimf.c
+++ b/math/s_fdimf.c
@@ -19,6 +19,7 @@
#include <errno.h>
#include <math.h>
+#include <math_private.h>
float
__fdimf (float x, float y)
@@ -26,7 +27,7 @@ __fdimf (float x, float y)
if (islessequal (x, y))
return 0.0f;
- float r = x - y;
+ float r = math_narrow_eval (x - y);
if (isinf (r) && !isinf (x) && !isinf (y))
__set_errno (ERANGE);