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[PATCH][BZ #16824] Fix failing y1 due to too large ulps in downward/upward rounding mode.

From: Stefan Liebler <stli at linux dot vnet dot ibm dot com>
To: libc-alpha at sourceware dot org
Date: Fri, 11 Apr 2014 13:56:55 +0200
Subject: [PATCH][BZ #16824] Fix failing y1 due to too large ulps in downward/upward rounding mode.
Authentication-results: sourceware.org; auth=none

Hi,

on s390 the y1 tests for long double fails due to too large ulps indownward / upward rounding mode (See Bug 16824).

According to Joseph Myers patch comment
(https://sourceware.org/ml/libc-alpha/2014-03/msg00620.html),
round-to-nearest is used internally to reduce error accumulation.
Tests on s390/s390x shows following ulps:
y1: 2
y1_downward: 4
y1_towardzero: 2
y1_upward: 5

Is this okay? On other architectures too?

Bye
---
2014-04-11  Stefan Liebler  <stli@linux.vnet.ibm.com>

	[BZ #16824]
	* sysdeps/ieee754/ldbl-128/e_j1l.c (__ieee754_y1l):
	Set round-to-nearest internally to reduce error accumulation.
---

Attachment: patchglibc_math_y1
Description: Text document

Follow-Ups:
- Re: [PATCH][BZ #16824] Fix failing y1 due to too large ulps in downward/upward rounding mode.
  - From: Adhemerval Zanella
- Re: [PATCH][BZ #16824] Fix failing y1 due to too large ulps in downward/upward rounding mode.
  - From: Siddhesh Poyarekar

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