MIPS: Add floor, ceil, round (truncate) instructions for ia32, x64 (if SSE4.1) and add floor, ceil,…

MIPS: Add floor, ceil, round (truncate) instructions for ia32, x64 (if SSE4.1) and add floor, ceil, round (truncate and away from zero) for arm64.

Port r25018 (77a5c80)

TEST=test/mjsunit/asm/math-floor.js,test/mjsunit/asm/math-ceil.js,test/unittest/compiler/js-builtin-reducer-unittest.cc
BUG=

[balazs.kilvady, 2014-10-31 18:49:26]

balazs.kilvady@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, danno@chromium.org, dusan.milosavljevic@imgtec.com,
gergely.kis@imgtec.com, paul.lind@imgtec.com, sigurds@chromium.org

[paul.l..., 2014-10-31 18:56:49]

LGTM.

[dusmil.imgtec, 2014-10-31 19:06:49]

Hmm, just checking are our versions of conversion instruction the same as
thous used in ARM port.

[paul.l..., 2014-10-31 19:11:40]

https://codereview.chromium.org/680833005/diff/20001/src/compiler/mips/instru...
File src/compiler/mips/instruction-selector-mips.cc (right):

https://codereview.chromium.org/680833005/diff/20001/src/compiler/mips/instru...
src/compiler/mips/instruction-selector-mips.cc:688: if
(CpuFeatures::IsSupported(MIPSr2)) {
Per side discussion between me & Balázs, this should be 'r2 or r6'. It is only
the mips r1 and earlier arch variants that do not support these instructions.

[dusmil.imgtec, 2014-10-31 19:12:50]

Not good, it looks like this is rounding only which produces double result from
double input.
I checked thin on ia32. I wish I was wrong.

[dusmil.imgtec, 2014-10-31 19:14:32]

Not good, it looks like this is rounding only which produces double result from
 double input.
 I checked this on ia32. I wish I was wrong. Instructions used in MIPS code will
produce LONG integer.

[sigurds, 2016-01-25 12:32:01]

Description was changed from

==========
MIPS: Add floor, ceil, round (truncate) instructions for ia32, x64 (if SSE4.1)
and add floor, ceil, round (truncate and away from zero) for arm64.

Port r25018 (77a5c80)

TEST=test/mjsunit/asm/math-floor.js,test/mjsunit/asm/math-ceil.js,test/unittest/compiler/js-builtin-reducer-unittest.cc
BUG=
==========

to

==========
MIPS: Add floor, ceil, round (truncate) instructions for ia32, x64 (if SSE4.1)
and add floor, ceil, round (truncate and away from zero) for arm64.

Port r25018 (77a5c80)

TEST=test/mjsunit/asm/math-floor.js,test/mjsunit/asm/math-ceil.js,test/unittest/compiler/js-builtin-reducer-unittest.cc
BUG=
==========