[RFC] cortex-a{53,57}-simd.md missing?

[Ilya Palachev]

Hi all.

This is a question related with current development of Aarch64 backend.

In latest trunk revision of GCC 5.0, in directory gcc/config/arm there 
are following files:

cortex-a{8,9,15,17}.md
cortex-a{8,9,15,17}-neon.md

These files contain constructions like

(define_insn_reservation insn-name default_latency condition regexp)

for both scalar and vector (NEON) instructions.

But for AdvSIMD aarch64 instructions in cortex-a53.md only the following 
lines can be found:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Crude Advanced SIMD approximation.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(define_insn_reservation "cortex_53_advsimd" 4
   (and (eq_attr "tune" "cortexa53")
        (eq_attr:q "is_neon_type" "yes"))
   "cortex_a53_simd0")

Does it mean that all AdvSIMD instructions for cortex-a53 are supposed 
to be of latency = 4?

In cortex-a57.md the description for "neon" instructions is more full, 
it contains a lot of statements for different SIMD instructions.
It appeared in trunk just a month ago.

Are there any plans to release detailed pipeline descriptions for SIMD 
instructions for cortex-a53?
How can it influence the performance of the generated code?

--
Best regards,
Ilya Palachev