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Rollup merge of #77161 - est31:swich_len_already_trusted, r=petrochenkov

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Remove TrustedLen requirement from BuilderMethods::switch

The main use case of TrustedLen is allowing APIs to specialize on it,
but no use of it uses that specialization. Instead, only the .len()
function provided by ExactSizeIterator is used, which is already
required to be accurate.

Thus, the TrustedLen requirement on BuilderMethods::switch is redundant.
This commit is contained in:
Ralf Jung 2020-09-26 12:58:24 +02:00 committed by GitHub
commit 7c47b1e5f4
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4 changed files with 2 additions and 6 deletions
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3
compiler/rustc_codegen_llvm/src/builder.rs
View File

@ -21,7 +21,6 @@
use rustc_target::spec::{HasTargetSpec, Target};
use std::borrow::Cow;
use std::ffi::CStr;
use std::iter::TrustedLen;
use std::ops::{Deref, Range};
use std::ptr;
use tracing::debug;
@ -179,7 +178,7 @@ fn switch(
&mut self,
v: &'ll Value,
else_llbb: &'ll BasicBlock,
cases: impl ExactSizeIterator<Item = (u128, &'ll BasicBlock)> + TrustedLen,
cases: impl ExactSizeIterator<Item = (u128, &'ll BasicBlock)>,
) {
let switch =
unsafe { llvm::LLVMBuildSwitch(self.llbuilder, v, else_llbb, cases.len() as c_uint) };

1
compiler/rustc_codegen_llvm/src/lib.rs
View File

@ -12,7 +12,6 @@
#![feature(in_band_lifetimes)]
#![feature(nll)]
#![feature(or_patterns)]
#![feature(trusted_len)]
#![recursion_limit = "256"]
use back::write::{create_informational_target_machine, create_target_machine};

1
compiler/rustc_codegen_ssa/src/lib.rs
View File

@ -6,7 +6,6 @@
#![feature(in_band_lifetimes)]
#![feature(nll)]
#![feature(or_patterns)]
#![feature(trusted_len)]
#![feature(associated_type_bounds)]
#![recursion_limit = "256"]

3
compiler/rustc_codegen_ssa/src/traits/builder.rs
View File

@ -18,7 +18,6 @@
use rustc_target::abi::{Abi, Align, Scalar, Size};
use rustc_target::spec::HasTargetSpec;
use std::iter::TrustedLen;
use std::ops::Range;
#[derive(Copy, Clone)]
@ -60,7 +59,7 @@ fn switch(
&mut self,
v: Self::Value,
else_llbb: Self::BasicBlock,
cases: impl ExactSizeIterator<Item = (u128, Self::BasicBlock)> + TrustedLen,
cases: impl ExactSizeIterator<Item = (u128, Self::BasicBlock)>,
);
fn invoke(
&mut self,