Feature #10081: [PATCH] Specifying MACRO for increase performence in ppc64

• Status: Closed
• Assignee: -
• Target version: 2.2.0

[gustavo.pedrosa (Gustavo Frederico Temple Pedrosa)]

To increase performance on ppc64 machines, the MACRO "powerpc64" were specified for the architecture, just like for x86_64 machines.

I've executed some benchmarks, see below:

Benchmark               Before (milliseconds)	After (milliseconds)	Percentage difference
bm_vm2_regexp.rb        4955                    4752                    -4,10%
bm_so_meteor_contest.rb 6065                    5817                    -4,09%
bm_app_pentomino.rb     35122                   34886                   -0,67%
bm_hash_flatten.rb      3055                    3011                    -1,44%
bm_so_sieve.rb          1227                    1210                    -1,39%

[nobu (Nobuyoshi Nakada)]

PowerPC64 can unaligned access?

[gustavo.pedrosa (Gustavo Frederico Temple Pedrosa)]

Nobuyoshi Nakada wrote:

PowerPC64 can unaligned access?

Yes, I have tested in my IBM POWER 7+ (rev 2.1)

[nobu (Nobuyoshi Nakada)]

Thank you.
Possibly, can PACKED_STRUCT_UNALIGNED also work on PowerPC64?

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

Applied in changeset r46915.

---

UNALIGNED_WORD_ACCESS on ppc64

• include/ruby/defines.h, siphash.c, st.c (UNALIGNED_WORD_ACCESS):
  add PowerPC64 too, which is capable to access unaligned words.
  patched by Gustavo Frederico Temple Pedrosa in [ruby-core:63937].
  [Feature #10081]
• regint.h (PLATFORM_UNALIGNED_WORD_ACCESS): ditto.