S390: Disable gcc generation of mul-add in cctests

S390: Disable gcc generation of mul-add in cctests

Generated code performs distinct floating multiply and add/subtract
operations. Tests fail when GCC uses mul-add to calculate the
expected result since these instructions provide higher accuracy due
to the lack of an intermediate round.

R=machenbach@chromium.org, mbrandy@us.ibm.com, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/faaf8512bfef5300d0f79a997acf12cb1dcfc05e
Cr-Commit-Position: refs/heads/master@{#34953}

[john.yan, 2016-03-18 16:23:32]

The CQ bit was checked by jyan@ca.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2016-03-18 16:23:39]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1812823008/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1812823008/1

[john.yan, 2016-03-18 16:23:48]

PTAL

[commit-bot: I haz the power, 2016-03-18 16:47:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-03-18 16:47:26]

Dry run: This issue passed the CQ dry run.

[Michael Achenbach, 2016-03-21 08:56:02]

lgtm

[john.yan, 2016-03-21 12:32:12]

The CQ bit was checked by jyan@ca.ibm.com

[commit-bot: I haz the power, 2016-03-21 12:32:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1812823008/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1812823008/1

[john.yan, 2016-03-21 14:17:23]

The CQ bit was checked by jyan@ca.ibm.com

[john.yan, 2016-03-21 14:17:24]

The patchset sent to the CQ was uploaded after l-g-t-m from
machenbach@chromium.org
Link to the patchset: https://codereview.chromium.org/1812823008/#ps20001
(title: "Rebased on master")

[commit-bot: I haz the power, 2016-03-21 14:17:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1812823008/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1812823008/20001

[commit-bot: I haz the power, 2016-03-21 16:42:55]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-03-21 16:43:41]

Description was changed from

==========
S390: Disable gcc generation of mul-add in cctests

Generated code performs distinct floating multiply and add/subtract
operations. Tests fail when GCC uses mul-add to calculate the
expected result since these instructions provide higher accuracy due
to the lack of an intermediate round.

R=machenbach@chromium.org, mbrandy@us.ibm.com, joransiu@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=
==========

to

==========
S390: Disable gcc generation of mul-add in cctests

Generated code performs distinct floating multiply and add/subtract
operations. Tests fail when GCC uses mul-add to calculate the
expected result since these instructions provide higher accuracy due
to the lack of an intermediate round.

R=machenbach@chromium.org, mbrandy@us.ibm.com, joransiu@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/faaf8512bfef5300d0f79a997acf12cb1dcfc05e
Cr-Commit-Position: refs/heads/master@{#34953}
==========

[commit-bot: I haz the power, 2016-03-21 16:43:43]

Patchset 2 (id:??) landed as
https://crrev.com/faaf8512bfef5300d0f79a997acf12cb1dcfc05e
Cr-Commit-Position: refs/heads/master@{#34953}