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[arm-embedded] Backport trunk Cortex-M4 FPU tuning to embedded-4_8-branch

Message ID 000901ceebed$e9a4c7f0$bcee57d0$@arm.com
State New
Headers show

Commit Message

Terry Guo Nov. 28, 2013, 3:57 a.m. UTC 
Hi,

This patch back ported a trunk cortex-m4 FPU tuning to embedded-4_8-branch.

BR,
Terry

gcc/ChangeLog.arm
2013-11-28  Terry Guo  <terry.guo@arm.com>
 
	Backport mainline r198084
	2013-04-19  Terry Guo  <terry.guo@arm.com>

	* config/arm/cortex-m4-fpu.md (cortex_m4_v): Delete cpu unit.
	Replace with ...
	(cortex_m4_v_a,  cortex_m4_v_b): ... new cpu units.
	(cortex_m4_v, cortex_m4_exa_va, cortex_m4_exb_vb): New reservations.
	(cortex_m4_fmacs): Use new reservations.
	(cortex_m4_f_load, cortex_m4_f_store): Likewise.
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Patch

Index: gcc/config/arm/cortex-m4-fpu.md
===================================================================
--- gcc/config/arm/cortex-m4-fpu.md	(revision 205473)
+++ gcc/config/arm/cortex-m4-fpu.md	(working copy)
@@ -18,10 +18,14 @@ 
 ;; along with GCC; see the file COPYING3.  If not see
 ;; <http://www.gnu.org/licenses/>.
 
-;; Use an artifial unit to model FPU.
-(define_cpu_unit "cortex_m4_v" "cortex_m4")
+;; Use two artificial units to model FPU.
+(define_cpu_unit "cortex_m4_v_a" "cortex_m4")
+(define_cpu_unit "cortex_m4_v_b" "cortex_m4")
 
+(define_reservation "cortex_m4_v" "cortex_m4_v_a+cortex_m4_v_b")
 (define_reservation "cortex_m4_ex_v" "cortex_m4_ex+cortex_m4_v")
+(define_reservation "cortex_m4_exa_va" "cortex_m4_a+cortex_m4_v_a")
+(define_reservation "cortex_m4_exb_vb" "cortex_m4_b+cortex_m4_v_b")
 
 ;; Integer instructions following VDIV or VSQRT complete out-of-order.
 (define_insn_reservation "cortex_m4_fdivs" 15
@@ -44,10 +48,12 @@ 
        (eq_attr "type" "fmuls"))
   "cortex_m4_ex_v")
 
+;; Integer instructions following multiply-accumulate instructions
+;; complete out-of-order.
 (define_insn_reservation "cortex_m4_fmacs" 4
   (and (eq_attr "tune" "cortexm4")
        (eq_attr "type" "fmacs,ffmas"))
-  "cortex_m4_ex_v*3")
+  "cortex_m4_ex_v,cortex_m4_v*2")
 
 (define_insn_reservation "cortex_m4_ffariths" 1
   (and (eq_attr "tune" "cortexm4")
@@ -77,12 +83,12 @@ 
 (define_insn_reservation "cortex_m4_f_load" 2
   (and (eq_attr "tune" "cortexm4")
        (eq_attr "type" "f_loads"))
-  "cortex_m4_ex_v*2")
+  "cortex_m4_exa_va,cortex_m4_exb_vb")
 
-(define_insn_reservation "cortex_m4_f_store" 2
+(define_insn_reservation "cortex_m4_f_store" 1
   (and (eq_attr "tune" "cortexm4")
        (eq_attr "type" "f_stores"))
-  "cortex_m4_ex_v*2")
+  "cortex_m4_exa_va")
 
 (define_insn_reservation "cortex_m4_f_loadd" 3
   (and (eq_attr "tune" "cortexm4")