S390: Use FIEBRA/FIDBRA for FP Floor/Ceil

S390: Use FIEBRA/FIDBRA for FP Floor/Ceil

The existing FloatFloor/Ceiling functions had an issue with handling
Number.MIN_VALUE (0x1 ==> 5e-324), and would incorrectly return
MIN_VALUE instead of 0/1.  Simplify the entire sequence by using the
available hardware instruction with the appropriate rounding mode
(POS_INF for Ceiling, NEG_INF for Floor).

Add missing FIEBRA/FIDBRA cases to disassembler.

R=jyan@ca.ibm.com,michael_dawson@ca.ibm.com,mbrandy@us.ibm.com
BUG=

Committed: https://crrev.com/06d7276b24384b134915b6b55a24ce9d1e022d02
Cr-Commit-Position: refs/heads/master@{#35239}

[JoranSiu, 2016-04-03 04:32:54]

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

[commit-bot: I haz the power, 2016-04-03 04:33:04]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1853973002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1853973002/1

[JoranSiu, 2016-04-03 04:34:03]

PTAL

[commit-bot: I haz the power, 2016-04-03 04:51:54]

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

[commit-bot: I haz the power, 2016-04-03 04:51:55]

Dry run: This issue passed the CQ dry run.

[john.yan, 2016-04-04 13:17:23]

lgtm

[JoranSiu, 2016-04-04 13:31:28]

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

[commit-bot: I haz the power, 2016-04-04 13:31:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1853973002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1853973002/1

[commit-bot: I haz the power, 2016-04-04 13:53:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-04 13:54:24]

Description was changed from

==========
S390: Use FIEBRA/FIDBRA for FP Floor/Ceil

The existing FloatFloor/Ceiling functions had an issue with handling
Number.MIN_VALUE (0x1 ==> 5e-324), and would incorrectly return
MIN_VALUE instead of 0/1.  Simplify the entire sequence by using the
available hardware instruction with the appropriate rounding mode
(POS_INF for Ceiling, NEG_INF for Floor).

Add missing FIEBRA/FIDBRA cases to disassembler.

R=jyan@ca.ibm.com,michael_dawson@ca.ibm.com,mbrandy@us.ibm.com
BUG=
==========

to

==========
S390: Use FIEBRA/FIDBRA for FP Floor/Ceil

The existing FloatFloor/Ceiling functions had an issue with handling
Number.MIN_VALUE (0x1 ==> 5e-324), and would incorrectly return
MIN_VALUE instead of 0/1.  Simplify the entire sequence by using the
available hardware instruction with the appropriate rounding mode
(POS_INF for Ceiling, NEG_INF for Floor).

Add missing FIEBRA/FIDBRA cases to disassembler.

R=jyan@ca.ibm.com,michael_dawson@ca.ibm.com,mbrandy@us.ibm.com
BUG=

Committed: https://crrev.com/06d7276b24384b134915b6b55a24ce9d1e022d02
Cr-Commit-Position: refs/heads/master@{#35239}
==========

[commit-bot: I haz the power, 2016-04-04 13:54:29]

Patchset 1 (id:??) landed as
https://crrev.com/06d7276b24384b134915b6b55a24ce9d1e022d02
Cr-Commit-Position: refs/heads/master@{#35239}