MIPS: Fix uninitialized upper word bits for Cvt_d_uw macro.

MIPS: Fix uninitialized upper word bits for Cvt_d_uw macro.

After Cvt_d_uw macro, upper 32 bits of the output remain
unitnitialized which caused flaky failures on some tests on
MIPS32R6

TEST=cctest/test-assembler-mips/MIPS13,mjsunit/asm/int32-umod
BUG=

Committed: https://crrev.com/108d52645a56fa068b21cda304e7f23675956b54
Cr-Commit-Position: refs/heads/master@{#32983}

[ivica.bogosavljevic, 2015-12-18 15:06:26]

Description was changed from

==========
MIPS: Fix uninitialized upper word bits for Cvt_d_uw macro.

After Cvt_d_uw macro, upper 32 bits of the output remain
unitnitialized which caused flaky failures on some tests on
MIPS32R6

TEST=cctest/test-assembler-mips/MIPS13,mjsunit/asm/int32-umod
BUG=
==========

to

==========
MIPS: Fix uninitialized upper word bits for Cvt_d_uw macro.

After Cvt_d_uw macro, upper 32 bits of the output remain
unitnitialized which caused flaky failures on some tests on
MIPS32R6

TEST=cctest/test-assembler-mips/MIPS13,mjsunit/asm/int32-umod
BUG=
==========

[ivica.bogosavljevic, 2015-12-18 15:06:27]

ivica.bogosavljevic@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, alan.li@imgtec.com, balazs.kilvady@imgtec.com,
djordje.pesic@imgtec.com, ilija.pavlovic@imgtec.com, miran.karic@imgtec.com,
paul.lind@imgtec.com

[ivica.bogosavljevic, 2015-12-18 15:07:56]

https://codereview.chromium.org/1537973002/diff/1/src/mips/macro-assembler-mi...
File src/mips/macro-assembler-mips.cc (right):

https://codereview.chromium.org/1537973002/diff/1/src/mips/macro-assembler-mi...
src/mips/macro-assembler-mips.cc:1272: mtc1(rs, scratch);
After mtc1, upper 32 bits of the register are unpredictable, and we needto use
Mthc1 to set them to zeros.

https://codereview.chromium.org/1537973002/diff/1/test/cctest/test-assembler-...
File test/cctest/test-assembler-mips.cc (right):

https://codereview.chromium.org/1537973002/diff/1/test/cctest/test-assembler-...
test/cctest/test-assembler-mips.cc:1822: CcTest::InitializeVM();
Enable tests for both MIPS32R2 and MIPS32R6

[paul.l..., 2015-12-21 06:20:45]

lgtm

[Ilija.Pavlovic1, 2015-12-21 08:56:06]

ilija.pavlovic@imgtec.com changed reviewers:
+ Ilija.Pavlovic@imgtec.com

[Ilija.Pavlovic1, 2015-12-21 08:56:06]

lgtm

[ivica.bogosavljevic, 2015-12-21 09:52:49]

The CQ bit was checked by ivica.bogosavljevic@imgtec.com to run a CQ dry run

[commit-bot: I haz the power, 2015-12-21 09:52:53]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1537973002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1537973002/1

[commit-bot: I haz the power, 2015-12-21 10:15:50]

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

[commit-bot: I haz the power, 2015-12-21 10:15:51]

Dry run: This issue passed the CQ dry run.

[ivica.bogosavljevic, 2015-12-21 10:47:55]

The CQ bit was checked by ivica.bogosavljevic@imgtec.com

[commit-bot: I haz the power, 2015-12-21 10:47:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1537973002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1537973002/1

[commit-bot: I haz the power, 2015-12-21 10:49:19]

Description was changed from

==========
MIPS: Fix uninitialized upper word bits for Cvt_d_uw macro.

After Cvt_d_uw macro, upper 32 bits of the output remain
unitnitialized which caused flaky failures on some tests on
MIPS32R6

TEST=cctest/test-assembler-mips/MIPS13,mjsunit/asm/int32-umod
BUG=
==========

to

==========
MIPS: Fix uninitialized upper word bits for Cvt_d_uw macro.

After Cvt_d_uw macro, upper 32 bits of the output remain
unitnitialized which caused flaky failures on some tests on
MIPS32R6

TEST=cctest/test-assembler-mips/MIPS13,mjsunit/asm/int32-umod
BUG=
==========

[commit-bot: I haz the power, 2015-12-21 10:49:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-21 10:49:45]

Description was changed from

==========
MIPS: Fix uninitialized upper word bits for Cvt_d_uw macro.

After Cvt_d_uw macro, upper 32 bits of the output remain
unitnitialized which caused flaky failures on some tests on
MIPS32R6

TEST=cctest/test-assembler-mips/MIPS13,mjsunit/asm/int32-umod
BUG=
==========

to

==========
MIPS: Fix uninitialized upper word bits for Cvt_d_uw macro.

After Cvt_d_uw macro, upper 32 bits of the output remain
unitnitialized which caused flaky failures on some tests on
MIPS32R6

TEST=cctest/test-assembler-mips/MIPS13,mjsunit/asm/int32-umod
BUG=

Committed: https://crrev.com/108d52645a56fa068b21cda304e7f23675956b54
Cr-Commit-Position: refs/heads/master@{#32983}
==========

[commit-bot: I haz the power, 2015-12-21 10:49:46]

Patchset 1 (id:??) landed as
https://crrev.com/108d52645a56fa068b21cda304e7f23675956b54
Cr-Commit-Position: refs/heads/master@{#32983}