std.Target: add CPU features and models for alpha

lib/std/Target.zig

@@ -700,7 +700,7 @@ pub const Os = struct {
 };
 
 pub const aarch64 = @import("Target/aarch64.zig");
-pub const alpha = @import("Target/generic.zig");
+pub const alpha = @import("Target/alpha.zig");
 pub const amdgcn = @import("Target/amdgcn.zig");
 pub const arc = @import("Target/arc.zig");
 pub const arm = @import("Target/arm.zig");
@@ -1944,6 +1944,7 @@ pub const Cpu = struct {
         /// Clang compatibility is important, consider using `baseline` instead.
         pub fn generic(arch: Arch) *const Model {
             return switch (arch) {
+                .alpha => &alpha.cpu.ev4,
                 .amdgcn => &amdgcn.cpu.gfx600,
                 .avr => &avr.cpu.avr1,
                 .kvx => &kvx.cpu.coolidge_v1,
@@ -1976,6 +1977,7 @@ pub const Cpu = struct {
         /// `Os.Tag.freestanding`.
         pub fn baseline(arch: Arch, os: Os) *const Model {
             return switch (arch) {
+                .alpha => &alpha.cpu.ev6,
                 .amdgcn => &amdgcn.cpu.gfx906,
                 .arm => switch (os.tag) {
                     .@"3ds" => &arm.cpu.mpcore,

lib/std/Target/alpha.zig

@@ -0,0 +1,101 @@
+//! This file is auto-generated by tools/update_cpu_features.zig.
+
+const std = @import("../std.zig");
+const CpuFeature = std.Target.Cpu.Feature;
+const CpuModel = std.Target.Cpu.Model;
+
+pub const Feature = enum {
+    bwx,
+    cix,
+    fix,
+    max,
+};
+
+pub const featureSet = CpuFeature.FeatureSetFns(Feature).featureSet;
+pub const featureSetHas = CpuFeature.FeatureSetFns(Feature).featureSetHas;
+pub const featureSetHasAny = CpuFeature.FeatureSetFns(Feature).featureSetHasAny;
+pub const featureSetHasAll = CpuFeature.FeatureSetFns(Feature).featureSetHasAll;
+
+pub const all_features = blk: {
+    const len = @typeInfo(Feature).@"enum".fields.len;
+    std.debug.assert(len <= CpuFeature.Set.needed_bit_count);
+    var result: [len]CpuFeature = undefined;
+    result[@intFromEnum(Feature.bwx)] = .{
+        .llvm_name = null,
+        .description = "Enable byte/word extensions",
+        .dependencies = featureSet(&[_]Feature{}),
+    };
+    result[@intFromEnum(Feature.cix)] = .{
+        .llvm_name = null,
+        .description = "Enable counting extensions",
+        .dependencies = featureSet(&[_]Feature{}),
+    };
+    result[@intFromEnum(Feature.fix)] = .{
+        .llvm_name = null,
+        .description = "Enable floating point move and square root extensions",
+        .dependencies = featureSet(&[_]Feature{}),
+    };
+    result[@intFromEnum(Feature.max)] = .{
+        .llvm_name = null,
+        .description = "Enable motion video extensions",
+        .dependencies = featureSet(&[_]Feature{}),
+    };
+    const ti = @typeInfo(Feature);
+    for (&result, 0..) |*elem, i| {
+        elem.index = i;
+        elem.name = ti.@"enum".fields[i].name;
+    }
+    break :blk result;
+};
+
+pub const cpu = struct {
+    pub const ev4: CpuModel = .{
+        .name = "ev4",
+        .llvm_name = null,
+        .features = featureSet(&[_]Feature{}),
+    };
+    pub const ev45: CpuModel = .{
+        .name = "ev45",
+        .llvm_name = null,
+        .features = featureSet(&[_]Feature{}),
+    };
+    pub const ev5: CpuModel = .{
+        .name = "ev5",
+        .llvm_name = null,
+        .features = featureSet(&[_]Feature{}),
+    };
+    pub const ev56: CpuModel = .{
+        .name = "ev56",
+        .llvm_name = null,
+        .features = featureSet(&[_]Feature{
+            .bwx,
+        }),
+    };
+    pub const ev6: CpuModel = .{
+        .name = "ev6",
+        .llvm_name = null,
+        .features = featureSet(&[_]Feature{
+            .bwx,
+            .fix,
+            .max,
+        }),
+    };
+    pub const ev67: CpuModel = .{
+        .name = "ev67",
+        .llvm_name = null,
+        .features = featureSet(&[_]Feature{
+            .bwx,
+            .cix,
+            .fix,
+            .max,
+        }),
+    };
+    pub const pca56: CpuModel = .{
+        .name = "pca56",
+        .llvm_name = null,
+        .features = featureSet(&[_]Feature{
+            .bwx,
+            .max,
+        }),
+    };
+};

tools/update_cpu_features.zig

@@ -393,6 +393,83 @@ const targets = [_]ArchTarget{
             "apple-latest",
         },
     },
+    .{
+        .zig_name = "alpha",
+        .llvm = null,
+        .extra_features = &.{
+            .{
+                .zig_name = "bwx",
+                .desc = "Enable byte/word extensions",
+                .deps = &.{},
+            },
+            .{
+                .zig_name = "cix",
+                .desc = "Enable counting extensions",
+                .deps = &.{},
+            },
+            .{
+                .zig_name = "fix",
+                .desc = "Enable floating point move and square root extensions",
+                .deps = &.{},
+            },
+            .{
+                .zig_name = "max",
+                .desc = "Enable motion video extensions",
+                .deps = &.{},
+            },
+        },
+        .extra_cpus = &.{
+            .{
+                .llvm_name = null,
+                .zig_name = "ev4",
+                .features = &.{},
+            },
+            .{
+                .llvm_name = null,
+                .zig_name = "ev45",
+                .features = &.{},
+            },
+            .{
+                .llvm_name = null,
+                .zig_name = "ev5",
+                .features = &.{},
+            },
+            .{
+                .llvm_name = null,
+                .zig_name = "ev56",
+                .features = &.{
+                    "bwx",
+                },
+            },
+            .{
+                .llvm_name = null,
+                .zig_name = "pca56",
+                .features = &.{
+                    "bwx",
+                    "max",
+                },
+            },
+            .{
+                .llvm_name = null,
+                .zig_name = "ev6",
+                .features = &.{
+                    "bwx",
+                    "fix",
+                    "max",
+                },
+            },
+            .{
+                .llvm_name = null,
+                .zig_name = "ev67",
+                .features = &.{
+                    "bwx",
+                    "cix",
+                    "fix",
+                    "max",
+                },
+            },
+        },
+    },
     .{
         .zig_name = "amdgcn",
         .llvm = .{