[PATCH] [x86] Adjust issue_rate for latest Intel processors.

[PATCH] [x86] Adjust issue_rate for latest Intel processors.

[liuhongt]

For Skylake based processor, decoder is 4-way.
For Sunny Cove and Willow Cove, decoder is 5-way.
For Golden cove, decoder is 6-way.

Bootstrapped and regtested on x86-64-pc-linux-gnu{-m32,}.
Ready to install.

gcc/ChangeLog:

	* config/i386/x86-tune-sched.cc (ix86_issue_rate): Adjust for
	latest Intel processors.
---
 gcc/config/i386/x86-tune-sched.cc | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gcc/config/i386/x86-tune-sched.cc b/gcc/config/i386/x86-tune-sched.cc
index 1ffaeef037c..e2765f81902 100644
--- a/gcc/config/i386/x86-tune-sched.cc
+++ b/gcc/config/i386/x86-tune-sched.cc
@@ -73,10 +73,24 @@ ix86_issue_rate (void)
     case PROCESSOR_SANDYBRIDGE:
     case PROCESSOR_HASWELL:
     case PROCESSOR_TREMONT:
+    case PROCESSOR_SKYLAKE:
+    case PROCESSOR_SKYLAKE_AVX512:
+    case PROCESSOR_CASCADELAKE:
+    case PROCESSOR_CANNONLAKE:
     case PROCESSOR_ALDERLAKE:
     case PROCESSOR_GENERIC:
       return 4;
 
+    case PROCESSOR_ICELAKE_CLIENT:
+    case PROCESSOR_ICELAKE_SERVER:
+    case PROCESSOR_TIGERLAKE:
+    case PROCESSOR_COOPERLAKE:
+    case PROCESSOR_ROCKETLAKE:
+      return 5;
+
+    case PROCESSOR_SAPPHIRERAPIDS:
+      return 6;
+
     default:
       return 1;
     }
-- 
2.18.1