diff mbox series

Fix cost of integer loads for generic model

Message ID 20180102093746.GB44218@kam.mff.cuni.cz
State New
Headers show
Series Fix cost of integer loads for generic model | expand

Commit Message

Jan Hubicka Jan. 2, 2018, 9:37 a.m. UTC 
Hi,
this patch fixes register allocation issue in spec2006 lbm benchmark improving it by
about 13%.

Bootstrapped/regtested x86_64-linux, will commit it soon.

Honza

	* x86-tune-costs.h (generic_cost): Increase cost of integer load to match
	other memory operations.
diff mbox series

Patch

diff --git a/gcc/config/i386/x86-tune-costs.h b/gcc/config/i386/x86-tune-costs.h
index eff7f7f6bbf..4f1795ad8d3 100644
--- a/gcc/config/i386/x86-tune-costs.h
+++ b/gcc/config/i386/x86-tune-costs.h
@@ -2259,8 +2260,8 @@  struct processor_costs generic_cost = {
 
   /* All move costs are relative to integer->integer move times 2 and thus
      they are latency*2. */
-  4,				     /* cost for loading QImode using movzbl */
-  {4, 4, 4},				/* cost of loading integer registers
+  6,				     /* cost for loading QImode using movzbl */
+  {6, 6, 6},				/* cost of loading integer registers
 					   in QImode, HImode and SImode.
 					   Relative to reg-reg move (2).  */
   {6, 6, 6},				/* cost of storing integer registers */