[PATCH] Regenerate ULPs for i486 builds.

[PATCH] Regenerate ULPs for i486 builds.

[Carlos O'Donell]

Joseph,

On i486 builds I see 3 failures:

FAIL: math/test-ildouble
FAIL: math/test-ldouble
FAIL: math/test-ldouble-finite
Summary of test results:
      3 FAIL
   2553 PASS
     45 XFAIL

They are all ULPs related e.g.
~~~
Failure: Test: pow_towardzero (0x1.000002p+0, -0x2p+0)
Result:
 is:          9.99999761581463530839e-01   0xf.ffffc00000bfffd0p-4
 should be:   9.99999761581463530947e-01   0xf.ffffc00000bffff0p-4
 difference:  1.08420217248550443400e-19   0x8.0000000000000000p-66
 ulp       :  2.0000
 max.ulp   :  1.0000
~~~

Why might we be 1-3 ULP worse than the previously checked in baseline?
The baseline were accurate when you added them in 2012, but perhaps
compiler changes have caused this regerssion.

It's not entirely out of line with what we have for the other pow
baselines, so I'm going to suggest updating the baseline, to avoid the
failures.

Regenerated with `make regen-ulps`.

OK to checkin?

2016-10-27  Carlos O'Donell  <carlos@redhat.com>

	* sysdeps/i386/fpu/libm-test-ulps: Regenerate.

diff --git a/sysdeps/i386/fpu/libm-test-ulps b/sysdeps/i386/fpu/libm-test-ulps
index 84da475..1858c06 100644
--- a/sysdeps/i386/fpu/libm-test-ulps
+++ b/sysdeps/i386/fpu/libm-test-ulps
@@ -1901,14 +1901,14 @@ ldouble: 4
 Function: "pow_towardzero":
 double: 1
 idouble: 1
-ildouble: 1
-ldouble: 1
+ildouble: 4
+ldouble: 4
 
 Function: "pow_upward":
 double: 1
 idouble: 1
-ildouble: 2
-ldouble: 2
+ildouble: 4
+ldouble: 4
 
 Function: "sin":
 float: 1
---

-- 
Cheers,
Carlos.

Re: [PATCH] Regenerate ULPs for i486 builds.

[Joseph Myers]

On Thu, 27 Oct 2016, Carlos O'Donell wrote:

> Why might we be 1-3 ULP worse than the previously checked in baseline?

Because, for the most part, when new tests or libm changes require ulps 
updates, people test for i686/fpu/multiarch and so update that file but 
not this one (the two can have slightly different results for some 
functions because of the different implementations used).  The new tests 
requiring this update were from commit 
c898991d8bcfacc825097ba389ffccc5367c2b2d.

> OK to checkin?

OK.

-- 
Joseph S. Myers
joseph@codesourcery.com