[PATCH][ARM/AArch64] Add CRC32 scheduling information to Cortex-A53 and Cortex-A57

[Kyrill Tkachov <kyrylo dot tkachov at arm dot com>]

Hi all,

Now that both backends have a way of generating CRC32 instructions this 
patch adds the crc type to the scheduling information for the Cortex-A53 
and Cortex-A57 cores.
For both Cortex-A53 and Cortex-A57 they behave similarly to shifted 
arithmetic instructions

When scheduling for the Cortex-A57 we use the Cortex-A15 pipeline 
description, so the crc type is added to cortex-a15.md.
CRC32 instructions can only be generated when targeting ARMv8-A so this 
will not affect codegen when tuning for the ARMv7-A Cortex-A15 core.

Ok for trunk?

2014-08-04  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

    * config/arm/cortex-a15.md (cortex_a15_alu_shift): Add crc type
    to reservation.
    * config/arm/cortex-a53.md (cortex_a53_alu_shift): Likewise.

commit 5efe4a288368d3fc291aae86ca426acf8716901a
Author: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date:   Tue Jun 17 16:57:55 2014 +0100

    [ARM/AArch64] Add scheduling information for CRC32 instructions

diff --git a/gcc/config/arm/cortex-a15.md b/gcc/config/arm/cortex-a15.md
index 54f3bea..cff9aa2 100644
--- a/gcc/config/arm/cortex-a15.md
+++ b/gcc/config/arm/cortex-a15.md
@@ -72,11 +72,14 @@
   "ca15_issue1,(ca15_sx1,ca15_sx1_alu)|(ca15_sx2,ca15_sx2_alu)")
 
 ;; ALU ops with immediate shift
+;; crc is also included here so that appropriate scheduling of CRC32 ARMv8-A
+;; instructions can be performed when tuning for the Cortex-A57 since that
+;; core reuses the Cortex-A15 pipeline description for the moment.
 (define_insn_reservation "cortex_a15_alu_shift" 3
   (and (eq_attr "tune" "cortexa15")
        (eq_attr "type" "extend,\
                         alu_shift_imm,alus_shift_imm,\
-                        logic_shift_imm,logics_shift_imm,\
+                        crc,logic_shift_imm,logics_shift_imm,\
                         mov_shift,mvn_shift"))
   "ca15_issue1,(ca15_sx1,ca15_sx1+ca15_sx1_shf,ca15_sx1_alu)\
 	       |(ca15_sx2,ca15_sx2+ca15_sx2_shf,ca15_sx2_alu)")
diff --git a/gcc/config/arm/cortex-a53.md b/gcc/config/arm/cortex-a53.md
index a629bd6..e342cb2 100644
--- a/gcc/config/arm/cortex-a53.md
+++ b/gcc/config/arm/cortex-a53.md
@@ -84,7 +84,7 @@
 (define_insn_reservation "cortex_a53_alu_shift" 2
   (and (eq_attr "tune" "cortexa53")
        (eq_attr "type" "alu_shift_imm,alus_shift_imm,\
-                        logic_shift_imm,logics_shift_imm,\
+                        crc,logic_shift_imm,logics_shift_imm,\
                         alu_shift_reg,alus_shift_reg,\
                         logic_shift_reg,logics_shift_reg,\
                         extend,mov_shift,mov_shift_reg,\