From 93cb0f1552b0c7285ef22f6713239675170a348b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Sun, 6 Sep 2026 09:09:30 +0200
Subject: [PATCH] std.zig.system.openbsd: implement powerpc CPU model detection

ref https://codeberg.org/ziglang/zig/issues/36726
---
 lib/std/zig/system/openbsd.zig | 55 ++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/lib/std/zig/system/openbsd.zig b/lib/std/zig/system/openbsd.zig
index 4a6b064210db8af1ade69625d6769657f1042420..39f2156ffa7dd189d826c4c4549e6e21445a6ee1 100644
--- a/lib/std/zig/system/openbsd.zig
+++ b/lib/std/zig/system/openbsd.zig
@@ -43,9 +43,64 @@ const aarch64 = struct {
     }
 };
 
+const powerpc = struct {
+    const models = .{
+        .{ "601", &std.Target.powerpc.cpu.@"601" },
+        .{ "603ev", &std.Target.powerpc.cpu.@"603ev" },
+        .{ "603e", &std.Target.powerpc.cpu.@"603e" },
+        .{ "603", &std.Target.powerpc.cpu.@"603" },
+        .{ "604ev", &std.Target.powerpc.cpu.@"604e" },
+        .{ "604", &std.Target.powerpc.cpu.@"604" },
+        .{ "7400", &std.Target.powerpc.cpu.@"7400" },
+        .{ "7410", &std.Target.powerpc.cpu.@"7400" },
+        .{ "7450", &std.Target.powerpc.cpu.@"7450" },
+        .{ "7451", &std.Target.powerpc.cpu.@"7450" },
+        .{ "7455", &std.Target.powerpc.cpu.@"7450" },
+        .{ "7457", &std.Target.powerpc.cpu.@"7450" },
+        .{ "7447A", &std.Target.powerpc.cpu.@"7450" },
+        .{ "7448", &std.Target.powerpc.cpu.@"7450" },
+        .{ "750FX", &std.Target.powerpc.cpu.@"750" },
+        .{ "750", &std.Target.powerpc.cpu.@"750" },
+        .{ "970FX", &std.Target.powerpc.cpu.@"970" },
+        .{ "970MP", &std.Target.powerpc.cpu.@"970" },
+        .{ "970", &std.Target.powerpc.cpu.@"970" },
+        .{ "IBM POWER8E", &std.Target.powerpc.cpu.pwr8 },
+        .{ "IBM POWER8NVL", &std.Target.powerpc.cpu.pwr8 },
+        .{ "IBM POWER8", &std.Target.powerpc.cpu.pwr8 },
+        .{ "IBM POWER9P", &std.Target.powerpc.cpu.pwr9 },
+        .{ "IBM POWER9", &std.Target.powerpc.cpu.pwr9 },
+    };
+
+    fn detectNativeCpu(arch: std.Target.Cpu.Arch) ?std.Target.Cpu {
+        const mib: [2]c_int = [_]c_int{
+            std.c.CTL.HW,
+            std.c.HW.MODEL,
+        };
+        var buf: [64:0]u8 = undefined;
+        var len: usize = buf.len + 1;
+
+        std.posix.sysctl(&mib, &buf, &len, null, 0) catch |err| switch (err) {
+            error.NameTooLong => unreachable,
+            error.PermissionDenied => unreachable,
+            error.SystemResources => unreachable,
+            error.UnknownName => unreachable,
+            error.Unexpected => return null,
+        };
+
+        const name = buf[0 .. len - 1 :0];
+
+        inline for (models) |pair| {
+            if (std.mem.startsWith(u8, name, pair[0])) return pair[1].toCpu(arch);
+        }
+
+        return null;
+    }
+};
+
 pub fn detectNativeCpuAndFeatures() ?std.Target.Cpu {
     return switch (native_arch) {
         .aarch64 => aarch64.detectNativeCpuAndFeatures(native_arch),
+        .powerpc, .powerpc64 => powerpc.detectNativeCpu(native_arch),
         else => null,
     };
 }
-- 
2.54.0