Use more robust checks in rustc for wasm

Author: alexcrichton

compiler/rustc_codegen_llvm/src/builder.rs

@@ -769,7 +769,7 @@ impl BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
         // we like. To ensure that LLVM picks the right instruction we choose
         // the raw wasm intrinsic functions which avoid LLVM inserting all the
         // other control flow automatically.
-        if self.sess().target.arch.starts_with("wasm32") {
+        if self.sess().target.is_like_wasm {
             let src_ty = self.cx.val_ty(val);
             if self.cx.type_kind(src_ty) != TypeKind::Vector {
                 let float_width = self.cx.float_width(src_ty);
@@ -791,7 +791,7 @@ impl BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
 
     fn fptosi(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
         // see `fptoui` above for why wasm is different here
-        if self.sess().target.arch.starts_with("wasm") {
+        if self.sess().target.is_like_wasm {
             let src_ty = self.cx.val_ty(val);
             if self.cx.type_kind(src_ty) != TypeKind::Vector {
                 let float_width = self.cx.float_width(src_ty);

compiler/rustc_codegen_llvm/src/consts.rs

@@ -490,7 +490,7 @@ impl StaticMethods for CodegenCx<'ll, 'tcx> {
 
             // Wasm statics with custom link sections get special treatment as they
             // go into custom sections of the wasm executable.
-            if self.tcx.sess.opts.target_triple.triple().starts_with("wasm") {
+            if self.tcx.sess.target.is_like_wasm {
                 if let Some(section) = attrs.link_section {
                     let section = llvm::LLVMMDStringInContext(
                         self.llcx,

compiler/rustc_typeck/src/check/mod.rs

@@ -536,8 +536,8 @@ fn fn_maybe_err(tcx: TyCtxt<'_>, sp: Span, abi: Abi) {
 }
 
 fn maybe_check_static_with_link_section(tcx: TyCtxt<'_>, id: LocalDefId, span: Span) {
-    // Only restricted on wasm32 target for now
-    if !tcx.sess.opts.target_triple.triple().starts_with("wasm") {
+    // Only restricted on wasm target for now
+    if !tcx.sess.target.is_like_wasm {
         return;
     }