[PATCH] Support -march=gracemont

[PATCH] Support -march=gracemont

[liuhongt]

Alderlake-N is E-core only, add it as an alias of Alderlake.

Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
Any comments?

gcc/ChangeLog:

	* common/config/i386/cpuinfo.h (get_intel_cpu): Detect
	Alderlake-N.
	* common/config/i386/i386-common.cc (alias_table): Support
	-march=gracemont as an alias of -march=alderlake.
---
 gcc/common/config/i386/cpuinfo.h      | 3 +++
 gcc/common/config/i386/i386-common.cc | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/gcc/common/config/i386/cpuinfo.h b/gcc/common/config/i386/cpuinfo.h
index 13102b9c5dc..941f728b48b 100644
--- a/gcc/common/config/i386/cpuinfo.h
+++ b/gcc/common/config/i386/cpuinfo.h
@@ -533,6 +533,9 @@ get_intel_cpu (struct __processor_model *cpu_model,
       cpu_model->__cpu_type = INTEL_COREI7;
       cpu_model->__cpu_subtype = INTEL_COREI7_TIGERLAKE;
       break;
+
+    case 0xbe:
+      /* Alder Lake N, E-core only.  */
     case 0x97:
     case 0x9a:
       /* Alder Lake.  */
diff --git a/gcc/common/config/i386/i386-common.cc b/gcc/common/config/i386/i386-common.cc
index 26005914079..8aa8bf12d76 100644
--- a/gcc/common/config/i386/i386-common.cc
+++ b/gcc/common/config/i386/i386-common.cc
@@ -2190,6 +2190,8 @@ const pta processor_alias_table[] =
     M_CPU_TYPE (INTEL_GOLDMONT_PLUS), P_PROC_SSE4_2},
   {"tremont", PROCESSOR_TREMONT, CPU_HASWELL, PTA_TREMONT,
     M_CPU_TYPE (INTEL_TREMONT), P_PROC_SSE4_2},
+  {"gracemont", PROCESSOR_ALDERLAKE, CPU_HASWELL, PTA_ALDERLAKE,
+   M_CPU_SUBTYPE (INTEL_COREI7_ALDERLAKE), P_PROC_AVX2},
   {"sierraforest", PROCESSOR_SIERRAFOREST, CPU_HASWELL, PTA_SIERRAFOREST,
     M_CPU_SUBTYPE (INTEL_SIERRAFOREST), P_PROC_AVX2},
   {"grandridge", PROCESSOR_GRANDRIDGE, CPU_HASWELL, PTA_GRANDRIDGE,
-- 
2.31.1