From: liuhongt <hongtao.liu@intel.com>
Date: Thu, 24 Oct 2019 03:13:00 +0000 (+0800)
Subject: According to instruction_tables.pdf
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=16516644d8f5c13e666251470d604778d347f796;p=gcc.git

According to instruction_tables.pdf

1. Set cost of movement inside mask registers a bit higher than gpr's.
2. Set cost of movement between mask register and gpr much higher than movement
   inside gpr, but still less equal than load/store.
3. Set cost of mask register load/store a bit higher than gpr load/store.

gcc/
	* config/i386/x86-tune-costs.h (skylake_cost): Adjust cost
	model.
---

diff --git a/gcc/config/i386/x86-tune-costs.h b/gcc/config/i386/x86-tune-costs.h
index 256c84e364e..a782a9dd9e3 100644
--- a/gcc/config/i386/x86-tune-costs.h
+++ b/gcc/config/i386/x86-tune-costs.h
@@ -1727,12 +1727,12 @@ struct processor_costs skylake_cost = {
   {8, 8, 8, 12, 24},			/* cost of storing SSE registers
 					   in 32,64,128,256 and 512-bit */
   6, 6,					/* SSE->integer and integer->SSE moves */
-  2, 2,				/* mask->integer and integer->mask moves */
-  {4, 4, 4},				/* cost of loading mask register
+  4, 6,				/* mask->integer and integer->mask moves */
+  {6, 6, 6},				/* cost of loading mask register
 					   in QImode, HImode, SImode.  */
-  {6, 6, 6},				/* cost if storing mask register
+  {8, 8, 8},				/* cost if storing mask register
 					   in QImode, HImode, SImode.  */
-  2,					/* cost of moving mask register.  */
+  3,					/* cost of moving mask register.  */
   /* End of register allocator costs.  */
   },