Flatten directory structure for cranelift_codegen_meta::isa

cranelift/codegen/meta/src/isa/s390x.rs

@@ -0,0 +1,47 @@
+use crate::cdsl::isa::TargetIsa;
+use crate::cdsl::settings::{SettingGroup, SettingGroupBuilder};
+
+use crate::shared::Definitions as SharedDefinitions;
+
+fn define_settings(_shared: &SettingGroup) -> SettingGroup {
+    let mut settings = SettingGroupBuilder::new("s390x");
+
+    // The baseline architecture for cranelift is z14 (arch12),
+    // so we list only facilities of later processors here.
+
+    // z15 (arch13) facilities
+    let has_mie2 = settings.add_bool(
+        "has_mie2",
+        "Has Miscellaneous-Instruction-Extensions Facility 2 support.",
+        "",
+        false,
+    );
+    let has_vxrs_ext2 = settings.add_bool(
+        "has_vxrs_ext2",
+        "Has Vector-Enhancements Facility 2 support.",
+        "",
+        false,
+    );
+
+    // Architecture level presets
+    settings.add_preset(
+        "arch13",
+        "Thirteenth Edition of the z/Architecture.",
+        preset!(has_mie2 && has_vxrs_ext2),
+    );
+
+    // Processor presets
+    settings.add_preset(
+        "z15",
+        "IBM z15 processor.",
+        preset!(has_mie2 && has_vxrs_ext2),
+    );
+
+    settings.build()
+}
+
+pub(crate) fn define(shared_defs: &mut SharedDefinitions) -> TargetIsa {
+    let settings = define_settings(&shared_defs.settings);
+
+    TargetIsa::new("s390x", settings)
+}