Detect AMD Family 26 extended models for cpuinfo_uarch_zen6 (#371)

* Fix cpuinfo_x86_normalize_brand_string unannotated fall-through warning

* Detect AMD Family 26 extended models for cpuinfo_uarch_zen6

Author: fbarchard

include/cpuinfo.h

@@ -431,6 +431,8 @@ enum cpuinfo_uarch {
 	cpuinfo_uarch_zen4 = 0x0020010C,
 	/** AMD Zen 5 microarchitecture. */
 	cpuinfo_uarch_zen5 = 0x0020010D,
+	/** AMD Zen 6 microarchitecture. */
+	cpuinfo_uarch_zen6 = 0x0020010E,
 
 	/** NSC Geode and AMD Geode GX and LX. */
 	cpuinfo_uarch_geode = 0x00200200,

src/x86/uarch.c

@@ -402,7 +402,21 @@ enum cpuinfo_uarch cpuinfo_x86_decode_uarch(
 					}
 					break;
 				case 0x1a:
-					return cpuinfo_uarch_zen5;
+					switch (model_info->extended_model) {
+						case 0x0: // model 00h..2Fh
+						case 0x1:
+						case 0x2:
+						case 0x4: // model 40h..4Fh
+							return cpuinfo_uarch_zen5;
+
+						case 0x5: // model 50h..5Fh
+						case 0x8: // model 80h..AFh
+						case 0x9:
+						case 0xA:
+						case 0xC: // model C0h..CFh
+							return cpuinfo_uarch_zen6;
+					}
+					break;
 			}
 			break;
 		case cpuinfo_vendor_hygon:

tools/cpu-info.c

@@ -144,6 +144,8 @@ static const char* uarch_to_string(enum cpuinfo_uarch uarch) {
 			return "Zen 4";
 		case cpuinfo_uarch_zen5:
 			return "Zen 5";
+		case cpuinfo_uarch_zen6:
+			return "Zen 6";
 		case cpuinfo_uarch_geode:
 			return "Geode";
 		case cpuinfo_uarch_bobcat: