3 files changed, 24 insertions, 33 deletions
diff --git a/compiler/rustc_target/src/asm/mod.rs b/compiler/rustc_target/src/asm/mod.rs
index aff1ff92d31..3c65c84b0de 100644
--- a/compiler/rustc_target/src/asm/mod.rs
+++ b/compiler/rustc_target/src/asm/mod.rs
@@ -20,16 +20,16 @@ macro_rules! def_reg_class {
         }
 
         impl $arch_regclass {
-            pub fn name(self) -> &'static str {
+            pub fn name(self) -> rustc_span::Symbol {
                 match self {
-                    $(Self::$class => stringify!($class),)*
+                    $(Self::$class => rustc_span::symbol::sym::$class,)*
                 }
             }
 
-            pub fn parse(_arch: super::InlineAsmArch, name: &str) -> Result<Self, &'static str> {
+            pub fn parse(_arch: super::InlineAsmArch, name: rustc_span::Symbol) -> Result<Self, &'static str> {
                 match name {
                     $(
-                        stringify!($class) => Ok(Self::$class),
+                        rustc_span::sym::$class => Ok(Self::$class),
                     )*
                     _ => Err("unknown register class"),
                 }
@@ -327,7 +327,7 @@ pub enum InlineAsmRegClass {
 }
 
 impl InlineAsmRegClass {
-    pub fn name(self) -> &'static str {
+    pub fn name(self) -> Symbol {
         match self {
             Self::X86(r) => r.name(),
             Self::Arm(r) => r.name(),
@@ -422,29 +422,22 @@ impl InlineAsmRegClass {
     }
 
     pub fn parse(arch: InlineAsmArch, name: Symbol) -> Result<Self, &'static str> {
-        // FIXME: use direct symbol comparison for register class names
-        name.with(|name| {
-            Ok(match arch {
-                InlineAsmArch::X86 | InlineAsmArch::X86_64 => {
-                    Self::X86(X86InlineAsmRegClass::parse(arch, name)?)
-                }
-                InlineAsmArch::Arm => Self::Arm(ArmInlineAsmRegClass::parse(arch, name)?),
-                InlineAsmArch::AArch64 => {
-                    Self::AArch64(AArch64InlineAsmRegClass::parse(arch, name)?)
-                }
-                InlineAsmArch::RiscV32 | InlineAsmArch::RiscV64 => {
-                    Self::RiscV(RiscVInlineAsmRegClass::parse(arch, name)?)
-                }
-                InlineAsmArch::Nvptx64 => Self::Nvptx(NvptxInlineAsmRegClass::parse(arch, name)?),
-                InlineAsmArch::Hexagon => {
-                    Self::Hexagon(HexagonInlineAsmRegClass::parse(arch, name)?)
-                }
-                InlineAsmArch::Mips | InlineAsmArch::Mips64 => {
-                    Self::Mips(MipsInlineAsmRegClass::parse(arch, name)?)
-                }
-                InlineAsmArch::SpirV => Self::SpirV(SpirVInlineAsmRegClass::parse(arch, name)?),
-                InlineAsmArch::Wasm32 => Self::Wasm(WasmInlineAsmRegClass::parse(arch, name)?),
-            })
+        Ok(match arch {
+            InlineAsmArch::X86 | InlineAsmArch::X86_64 => {
+                Self::X86(X86InlineAsmRegClass::parse(arch, name)?)
+            }
+            InlineAsmArch::Arm => Self::Arm(ArmInlineAsmRegClass::parse(arch, name)?),
+            InlineAsmArch::AArch64 => Self::AArch64(AArch64InlineAsmRegClass::parse(arch, name)?),
+            InlineAsmArch::RiscV32 | InlineAsmArch::RiscV64 => {
+                Self::RiscV(RiscVInlineAsmRegClass::parse(arch, name)?)
+            }
+            InlineAsmArch::Nvptx64 => Self::Nvptx(NvptxInlineAsmRegClass::parse(arch, name)?),
+            InlineAsmArch::Hexagon => Self::Hexagon(HexagonInlineAsmRegClass::parse(arch, name)?),
+            InlineAsmArch::Mips | InlineAsmArch::Mips64 => {
+                Self::Mips(MipsInlineAsmRegClass::parse(arch, name)?)
+            }
+            InlineAsmArch::SpirV => Self::SpirV(SpirVInlineAsmRegClass::parse(arch, name)?),
+            InlineAsmArch::Wasm32 => Self::Wasm(WasmInlineAsmRegClass::parse(arch, name)?),
         })
     }
 
@@ -484,7 +477,7 @@ impl fmt::Display for InlineAsmRegOrRegClass {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::Reg(r) => write!(f, "\"{}\"", r.name()),
-            Self::RegClass(r) => f.write_str(r.name()),
+            Self::RegClass(r) => write!(f, "{}", r.name()),
         }
     }
 }
diff --git a/compiler/rustc_target/src/lib.rs b/compiler/rustc_target/src/lib.rs
index fb747dfcbd3..1ad57582eba 100644
--- a/compiler/rustc_target/src/lib.rs
+++ b/compiler/rustc_target/src/lib.rs
@@ -15,6 +15,7 @@
 #![feature(never_type)]
 #![feature(associated_type_bounds)]
 #![feature(exhaustive_patterns)]
+#![feature(str_split_once)]
 
 #[macro_use]
 extern crate rustc_macros;
diff --git a/compiler/rustc_target/src/spec/apple_base.rs b/compiler/rustc_target/src/spec/apple_base.rs
index e271a6dec40..88422395216 100644
--- a/compiler/rustc_target/src/spec/apple_base.rs
+++ b/compiler/rustc_target/src/spec/apple_base.rs
@@ -54,10 +54,7 @@ fn macos_deployment_target() -> (u32, u32) {
     let deployment_target = env::var("MACOSX_DEPLOYMENT_TARGET").ok();
     let version = deployment_target
         .as_ref()
-        .and_then(|s| {
-            let mut i = s.splitn(2, '.');
-            i.next().and_then(|a| i.next().map(|b| (a, b)))
-        })
+        .and_then(|s| s.split_once('.'))
         .and_then(|(a, b)| a.parse::<u32>().and_then(|a| b.parse::<u32>().map(|b| (a, b))).ok());
 
     version.unwrap_or((10, 7))