Remove the quad_precision_float feature gate

The f128 type has very little support in the compiler and the feature is
basically unusable today. Supporting half-baked features in the compiler can be
detrimental to the long-term development of the compiler, and hence this feature
is being removed.

Author: alexcrichton

src/libcore/intrinsics.rs

@@ -96,7 +96,6 @@ pub trait TyVisitor {
 
     fn visit_f32(&mut self) -> bool;
     fn visit_f64(&mut self) -> bool;
-    fn visit_f128(&mut self) -> bool;
 
     fn visit_char(&mut self) -> bool;
 

src/libdebug/lib.rs

@@ -25,7 +25,7 @@
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/")]
 #![experimental]
-#![feature(managed_boxes, macro_rules, quad_precision_float)]
+#![feature(managed_boxes, macro_rules)]
 #![allow(experimental)]
 
 pub mod fmt;

src/libdebug/reflect.rs

@@ -179,13 +179,6 @@ impl<V:TyVisitor + MovePtr> TyVisitor for MovePtrAdaptor<V> {
         true
     }
 
-    fn visit_f128(&mut self) -> bool {
-        self.align_to::<f128>();
-        if ! self.inner.visit_f128() { return false; }
-        self.bump_past::<f128>();
-        true
-    }
-
     fn visit_char(&mut self) -> bool {
         self.align_to::<char>();
         if ! self.inner.visit_char() { return false; }

src/libdebug/repr.rs

@@ -258,7 +258,6 @@ impl<'a> TyVisitor for ReprVisitor<'a> {
 
     fn visit_f32(&mut self) -> bool { self.write::<f32>() }
     fn visit_f64(&mut self) -> bool { self.write::<f64>() }
-    fn visit_f128(&mut self) -> bool { fail!("not implemented") }
 
     fn visit_char(&mut self) -> bool {
         self.get::<char>(|this, &ch| {

src/libhexfloat/lib.rs

@@ -112,7 +112,6 @@ pub fn expand_syntax_ext(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
         Some(Ident{ident, span}) => match token::get_ident(ident).get() {
             "f32" => Some(ast::TyF32),
             "f64" => Some(ast::TyF64),
-            "f128" => Some(ast::TyF128),
             _ => {
                 cx.span_err(span, "invalid floating point type in hexfloat!");
                 None

src/librustc/front/feature_gate.rs

@@ -64,7 +64,7 @@ static KNOWN_FEATURES: &'static [(&'static str, Status)] = &[
     ("overloaded_calls", Active),
     ("unboxed_closure_sugar", Active),
 
-    ("quad_precision_float", Active),
+    ("quad_precision_float", Removed),
 
     // A temporary feature gate used to enable parser extensions needed
     // to bootstrap fix for #5723.
@@ -91,7 +91,6 @@ enum Status {
 /// A set of features to be used by later passes.
 pub struct Features {
     pub default_type_params: Cell<bool>,
-    pub quad_precision_float: Cell<bool>,
     pub issue_5723_bootstrap: Cell<bool>,
     pub overloaded_calls: Cell<bool>,
 }
@@ -100,7 +99,6 @@ impl Features {
     pub fn new() -> Features {
         Features {
             default_type_params: Cell::new(false),
-            quad_precision_float: Cell::new(false),
             issue_5723_bootstrap: Cell::new(false),
             overloaded_calls: Cell::new(false),
         }
@@ -425,7 +423,6 @@ pub fn check_crate(sess: &Session, krate: &ast::Crate) {
     sess.abort_if_errors();
 
     sess.features.default_type_params.set(cx.has_feature("default_type_params"));
-    sess.features.quad_precision_float.set(cx.has_feature("quad_precision_float"));
     sess.features.issue_5723_bootstrap.set(cx.has_feature("issue_5723_bootstrap"));
     sess.features.overloaded_calls.set(cx.has_feature("overloaded_calls"));
 }

src/librustc/metadata/tydecode.rs

@@ -330,7 +330,6 @@ fn parse_ty(st: &mut PState, conv: conv_did) -> ty::t {
           'D' => return ty::mk_mach_int(ast::TyI64),
           'f' => return ty::mk_mach_float(ast::TyF32),
           'F' => return ty::mk_mach_float(ast::TyF64),
-          'Q' => return ty::mk_mach_float(ast::TyF128),
           _ => fail!("parse_ty: bad numeric type")
         }
       }

src/librustc/metadata/tyencode.rs

@@ -221,7 +221,6 @@ fn enc_sty(w: &mut MemWriter, cx: &ctxt, st: &ty::sty) {
             match t {
                 TyF32 => mywrite!(w, "Mf"),
                 TyF64 => mywrite!(w, "MF"),
-                TyF128 => mywrite!(w, "MQ")
             }
         }
         ty::ty_enum(def, ref substs) => {

src/librustc/middle/resolve.rs

@@ -770,7 +770,6 @@ impl PrimitiveTypeTable {
         table.intern("char",    TyChar);
         table.intern("f32",     TyFloat(TyF32));
         table.intern("f64",     TyFloat(TyF64));
-        table.intern("f128",    TyFloat(TyF128));
         table.intern("int",     TyInt(TyI));
         table.intern("i8",      TyInt(TyI8));
         table.intern("i16",     TyInt(TyI16));

src/librustc/middle/trans/debuginfo.rs

@@ -1621,7 +1621,6 @@ fn basic_type_metadata(cx: &CrateContext, t: ty::t) -> DIType {
         ty::ty_float(float_ty) => match float_ty {
             ast::TyF32 => ("f32".to_string(), DW_ATE_float),
             ast::TyF64 => ("f64".to_string(), DW_ATE_float),
-            ast::TyF128 => ("f128".to_string(), DW_ATE_float)
         },
         _ => cx.sess().bug("debuginfo::basic_type_metadata - t is invalid type")
     };

src/librustc/middle/trans/reflect.rs

@@ -148,7 +148,6 @@ impl<'a, 'b> Reflector<'a, 'b> {
           ty::ty_uint(ast::TyU64) => self.leaf("u64"),
           ty::ty_float(ast::TyF32) => self.leaf("f32"),
           ty::ty_float(ast::TyF64) => self.leaf("f64"),
-          ty::ty_float(ast::TyF128) => self.leaf("f128"),
 
           // Should rename to vec_*.
           ty::ty_vec(ref mt, Some(sz)) => {

src/librustc/middle/trans/type_.rs

@@ -88,10 +88,6 @@ impl Type {
         ty!(llvm::LLVMDoubleTypeInContext(ccx.llcx))
     }
 
-    pub fn f128(ccx: &CrateContext) -> Type {
-        ty!(llvm::LLVMFP128TypeInContext(ccx.llcx))
-    }
-
     pub fn bool(ccx: &CrateContext) -> Type {
         Type::i1(ccx)
     }
@@ -135,7 +131,6 @@ impl Type {
         match t {
             ast::TyF32 => Type::f32(ccx),
             ast::TyF64 => Type::f64(ccx),
-            ast::TyF128 => Type::f128(ccx)
         }
     }
 

src/librustc/middle/ty.rs

@@ -694,7 +694,6 @@ mod primitives {
     def_prim_ty!(TY_U64,    super::ty_uint(ast::TyU64),     12)
     def_prim_ty!(TY_F32,    super::ty_float(ast::TyF32),    14)
     def_prim_ty!(TY_F64,    super::ty_float(ast::TyF64),    15)
-    def_prim_ty!(TY_F128,   super::ty_float(ast::TyF128),   16)
 
     pub static TY_BOT: t_box_ = t_box_ {
         sty: super::ty_bot,
@@ -1272,9 +1271,6 @@ pub fn mk_f32() -> t { mk_prim_t(&primitives::TY_F32) }
 #[inline]
 pub fn mk_f64() -> t { mk_prim_t(&primitives::TY_F64) }
 
-#[inline]
-pub fn mk_f128() -> t { mk_prim_t(&primitives::TY_F128) }
-
 #[inline]
 pub fn mk_uint() -> t { mk_prim_t(&primitives::TY_UINT) }
 
@@ -1314,7 +1310,6 @@ pub fn mk_mach_float(tm: ast::FloatTy) -> t {
     match tm {
         ast::TyF32  => mk_f32(),
         ast::TyF64  => mk_f64(),
-        ast::TyF128 => mk_f128()
     }
 }
 

src/librustc/middle/typeck/astconv.rs

@@ -355,13 +355,6 @@ pub fn ast_ty_to_prim_ty(tcx: &ty::ctxt, ast_ty: &ast::Ty) -> Option<ty::t> {
                             Some(ty::mk_mach_uint(uit))
                         }
                         ast::TyFloat(ft) => {
-                            if ft == ast::TyF128 && !tcx.sess.features.quad_precision_float.get() {
-                                tcx.sess.span_err(path.span, "quadruple precision floats are \
-                                                              missing complete runtime support");
-                                tcx.sess.span_note(path.span, "add \
-                                                               #[feature(quad_precision_float)] \
-                                                               to the crate attributes to enable");
-                            }
                             check_path_args(tcx, path, NO_TPS | NO_REGIONS);
                             Some(ty::mk_mach_float(ft))
                         }

src/librustdoc/clean/mod.rs

@@ -1072,7 +1072,7 @@ pub enum Type {
 pub enum Primitive {
     Int, I8, I16, I32, I64,
     Uint, U8, U16, U32, U64,
-    F32, F64, F128,
+    F32, F64,
     Char,
     Bool,
     Nil,
@@ -1111,7 +1111,6 @@ impl Primitive {
             "str" => Some(Str),
             "f32" => Some(F32),
             "f64" => Some(F64),
-            "f128" => Some(F128),
             "slice" => Some(Slice),
             "tuple" => Some(PrimitiveTuple),
             _ => None,
@@ -1153,7 +1152,6 @@ impl Primitive {
             U64 => "u64",
             F32 => "f32",
             F64 => "f64",
-            F128 => "f128",
             Str => "str",
             Bool => "bool",
             Char => "char",
@@ -1227,7 +1225,6 @@ impl Clean<Type> for ty::t {
             ty::ty_uint(ast::TyU64) => Primitive(U64),
             ty::ty_float(ast::TyF32) => Primitive(F32),
             ty::ty_float(ast::TyF64) => Primitive(F64),
-            ty::ty_float(ast::TyF128) => Primitive(F128),
             ty::ty_str => Primitive(Str),
             ty::ty_box(t) => Managed(box t.clean()),
             ty::ty_uniq(t) => Unique(box t.clean()),
@@ -2010,7 +2007,6 @@ fn resolve_type(path: Path, tpbs: Option<Vec<TyParamBound>>,
             ast::TyUint(ast::TyU64) => return Primitive(U64),
             ast::TyFloat(ast::TyF32) => return Primitive(F32),
             ast::TyFloat(ast::TyF64) => return Primitive(F64),
-            ast::TyFloat(ast::TyF128) => return Primitive(F128),
         },
         def::DefTyParam(_, i, _) => return Generic(i),
         def::DefTyParamBinder(i) => return TyParamBinder(i),

src/libsyntax/ast.rs

@@ -700,7 +700,6 @@ impl fmt::Show for UintTy {
 pub enum FloatTy {
     TyF32,
     TyF64,
-    TyF128
 }
 
 impl fmt::Show for FloatTy {

src/libsyntax/ast_util.rs

@@ -179,7 +179,6 @@ pub fn float_ty_to_str(t: FloatTy) -> String {
     match t {
         TyF32 => "f32".to_string(),
         TyF64 => "f64".to_string(),
-        TyF128 => "f128".to_string(),
     }
 }
 

src/libsyntax/ext/quote.rs

@@ -483,7 +483,6 @@ fn mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> Gc<ast::Expr> {
             let s_fty = match fty {
                 ast::TyF32 => "TyF32",
                 ast::TyF64 => "TyF64",
-                ast::TyF128 => "TyF128"
             };
             let e_fty = mk_ast_path(cx, sp, s_fty);
             let e_fident = mk_ident(cx, sp, fident);

src/libsyntax/parse/lexer/mod.rs

@@ -639,16 +639,9 @@ impl<'a> StringReader<'a> {
                 /* FIXME (#2252): if this is out of range for either a
                 32-bit or 64-bit float, it won't be noticed till the
                 back-end.  */
-            } else if c == '1' && n == '2' && self.nextnextch().unwrap_or('\x00') == '8' {
-                self.bump();
-                self.bump();
-                self.bump();
-                let last_bpos = self.last_pos;
-                self.check_float_base(start_bpos, last_bpos, base);
-                return token::LIT_FLOAT(str_to_ident(num_str.as_slice()), ast::TyF128);
             }
             let last_bpos = self.last_pos;
-            self.err_span_(start_bpos, last_bpos, "expected `f32`, `f64` or `f128` suffix");
+            self.err_span_(start_bpos, last_bpos, "expected `f32` or `f64` suffix");
         }
         if is_float {
             let last_bpos = self.last_pos;

src/test/run-pass/quad-precision-float.rs

@@ -58,7 +58,6 @@ impl TyVisitor for MyVisitor {
 
     fn visit_f32(&mut self) -> bool { true }
     fn visit_f64(&mut self) -> bool { true }
-    fn visit_f128(&mut self) -> bool { true }
 
     fn visit_char(&mut self) -> bool { true }