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Rollup merge of #89072 - bjorn3:less_symbol_as_str, r=michaelwoerister

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Avoid a couple of Symbol::as_str calls in cg_llvm

This should improve performance a tiny bit. Also remove `Symbol::len` and make `SymbolIndex` private.
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Jubilee 2021-09-24 11:40:12 -07:00 • committed by GitHub
commit 8a454f8101
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3 changed files with 11 additions and 12 deletions
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15
compiler/rustc_codegen_llvm/src/intrinsic.rs
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@ -96,7 +96,6 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
let arg_tys = sig.inputs();
let ret_ty = sig.output();
let name = tcx.item_name(def_id);
let name_str = &*name.as_str();
let llret_ty = self.layout_of(ret_ty).llvm_type(self);
let result = PlaceRef::new_sized(llresult, fn_abi.ret.layout);
@ -230,9 +229,14 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
&[args[0].immediate(), y],
)
}
sym::ctlz_nonzero | sym::cttz_nonzero => {
sym::ctlz_nonzero => {
let y = self.const_bool(true);
let llvm_name = &format!("llvm.{}.i{}", &name_str[..4], width);
let llvm_name = &format!("llvm.ctlz.i{}", width);
self.call_intrinsic(llvm_name, &[args[0].immediate(), y])
}
sym::cttz_nonzero => {
let y = self.const_bool(true);
let llvm_name = &format!("llvm.cttz.i{}", width);
self.call_intrinsic(llvm_name, &[args[0].immediate(), y])
}
sym::ctpop => self.call_intrinsic(
@ -353,7 +357,7 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
return;
}
_ if name_str.starts_with("simd_") => {
_ if name.as_str().starts_with("simd_") => {
match generic_simd_intrinsic(self, name, callee_ty, args, ret_ty, llret_ty, span) {
Ok(llval) => llval,
Err(()) => return,
@ -843,7 +847,6 @@ fn generic_simd_intrinsic(
let sig =
tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), callee_ty.fn_sig(tcx));
let arg_tys = sig.inputs();
let name_str = &*name.as_str();
if name == sym::simd_select_bitmask {
let in_ty = arg_tys[0];
@ -917,7 +920,7 @@ fn generic_simd_intrinsic(
));
}
if let Some(stripped) = name_str.strip_prefix("simd_shuffle") {
if let Some(stripped) = name.as_str().strip_prefix("simd_shuffle") {
// If this intrinsic is the older "simd_shuffleN" form, simply parse the integer.
// If there is no suffix, use the index array length.
let n: u64 = if stripped.is_empty() {