meta-xilinx/meta-xilinx-bsp/recipes-microblaze/gcc/gcc-8/0023-Patch-OPT-Update-heuristics-for-loop-invariant-for-a.patch

From a28768eec0a9d5137196bed8e8c6d284cf4c3cbc Mon Sep 17 00:00:00 2001
From: Mahesh Bodapati <mbodapat@xilinx.com>
Date: Tue, 17 Jan 2017 17:33:31 +0530
Subject: [PATCH 23/54] [Patch] OPT: Update heuristics for loop-invariant for
 address arithme. .tic.

The changes are made in the patch to update the heuristics
for loop invariant for address arithmetic. The heuristics is
changed to calculate the estimated register pressure cost when
ira based register pressure is not enabled. The estimated
register pressure cost modifies the existing calculation cost
associated to perform the Loop invariant code motion for address
arithmetic.

ChangeLog:
2015-06-17  Ajit Agarwal  <ajitkum@xilinx.com>
            Nagaraju Mekala <nmekala@xilinx.com>

	* loop-invariant.c (gain_for_invariant): update the
	heuristics for estimate_reg_pressure_cost.

Signed-off-by:Ajit Agarwal ajitkum@xilinx.com
              Nagaraju Mekala nmekala@xilinx.com
---
 gcc/loop-invariant.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/gcc/loop-invariant.c b/gcc/loop-invariant.c
index bd31a51..8e22ca0 100644
--- a/gcc/loop-invariant.c
+++ b/gcc/loop-invariant.c
@@ -1466,10 +1466,8 @@ gain_for_invariant (struct invariant *inv, unsigned *regs_needed,
 
   if (! flag_ira_loop_pressure)
     {
-      size_cost = (estimate_reg_pressure_cost (new_regs[0] + regs_needed[0],
-					       regs_used, speed, call_p)
-		   - estimate_reg_pressure_cost (new_regs[0],
-						 regs_used, speed, call_p));
+      size_cost = estimate_reg_pressure_cost (regs_needed[0],
+					       regs_used, speed, call_p);
     }
   else if (ret < 0)
     return -1;
-- 
2.7.4