From: ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 23 Mar 2016 10:39:10 +0000 (+0000)
Subject: [ARM] Reduce size of arm1020e automaton
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9ada59d2ab98f2a92f9d496c420004f0fbebafce;p=thirdparty%2Fgcc.git

[ARM] Reduce size of arm1020e automaton

	* config/arm/arm1020e.md (1020call_op): Reduce reservation
	duration.
	(v10_fdivs): Likewise.
	(v10_fdivd): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@234422 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f78ff93a9a40..f4251133922f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2016-03-23  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* config/arm/arm1020e.md (1020call_op): Reduce reservation
+	duration.
+	(v10_fdivs): Likewise.
+	(v10_fdivd): Likewise.
+
 2016-03-23  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	PR driver/70132
diff --git a/gcc/config/arm/arm1020e.md b/gcc/config/arm/arm1020e.md
index 7cdab57ddb34..84a300d80454 100644
--- a/gcc/config/arm/arm1020e.md
+++ b/gcc/config/arm/arm1020e.md
@@ -246,13 +246,14 @@
       (eq_attr "type" "branch"))
  "1020a_e")
 
-;; The latency for a call is not predictable.  Therefore, we use 32 as
-;; roughly equivalent to positive infinity.
+;; The latency for a call is not predictable.  Therefore, we model as blocking
+;; execution for a number of cycles but we can't do anything more accurate
+;; than that.
 
 (define_insn_reservation "1020call_op" 32
  (and (eq_attr "tune" "arm1020e,arm1022e")
       (eq_attr "type" "call"))
- "1020a_e*32")
+ "1020a_e*4")
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; VFP
@@ -300,12 +301,12 @@
 (define_insn_reservation "v10_fdivs" 18
  (and (eq_attr "vfp10" "yes")
       (eq_attr "type" "fdivs, fsqrts"))
- "1020a_e+v10_ds*14")
+ "1020a_e+v10_ds*4")
 
 (define_insn_reservation "v10_fdivd" 32
  (and (eq_attr "vfp10" "yes")
       (eq_attr "type" "fdivd, fsqrtd"))
- "1020a_e+v10_fmac+v10_ds*28")
+ "1020a_e+v10_fmac+v10_ds*4")
 
 (define_insn_reservation "v10_floads" 4
  (and (eq_attr "vfp10" "yes")