bjoernager/rust
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Stop generating allocas+memcmp for simple array equality

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This commit is contained in:
Scott McMurray 2021-05-30 10:25:41 -07:00
parent d05eafae2f
commit 2456495a26
12 changed files with 238 additions and 4 deletions
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5
compiler/rustc_codegen_llvm/src/context.rs
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@ -500,6 +500,7 @@ impl CodegenCx<'b, 'tcx> {
let t_i32 = self.type_i32();
let t_i64 = self.type_i64();
let t_i128 = self.type_i128();
let t_isize = self.type_isize();
let t_f32 = self.type_f32();
let t_f64 = self.type_f64();
@ -712,6 +713,10 @@ impl CodegenCx<'b, 'tcx> {
ifn!("llvm.assume", fn(i1) -> void);
ifn!("llvm.prefetch", fn(i8p, t_i32, t_i32, t_i32) -> void);
// This isn't an "LLVM intrinsic", but LLVM's optimization passes
// recognize it like one and we assume it exists in `core::slice::cmp`
ifn!("memcmp", fn(i8p, i8p, t_isize) -> t_i32);
// variadic intrinsics
ifn!("llvm.va_start", fn(i8p) -> void);
ifn!("llvm.va_end", fn(i8p) -> void);