diff options
Diffstat (limited to 'compiler/rustc_codegen_ssa/src')
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/mir/rvalue.rs | 3 | ||||
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/traits/builder.rs | 12 |
2 files changed, 15 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs index d24e48b37a4..992a23442e2 100644 --- a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs +++ b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs @@ -1005,6 +1005,9 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { mir::BinOp::Cmp => { use std::cmp::Ordering; assert!(!is_float); + if let Some(value) = bx.three_way_compare(lhs_ty, lhs, rhs) { + return value; + } let pred = |op| base::bin_op_to_icmp_predicate(op, is_signed); if bx.cx().tcx().sess.opts.optimize == OptLevel::No { // FIXME: This actually generates tighter assembly, and is a classic trick diff --git a/compiler/rustc_codegen_ssa/src/traits/builder.rs b/compiler/rustc_codegen_ssa/src/traits/builder.rs index 99fd6b6510f..070b680e540 100644 --- a/compiler/rustc_codegen_ssa/src/traits/builder.rs +++ b/compiler/rustc_codegen_ssa/src/traits/builder.rs @@ -397,6 +397,18 @@ pub trait BuilderMethods<'a, 'tcx>: fn icmp(&mut self, op: IntPredicate, lhs: Self::Value, rhs: Self::Value) -> Self::Value; fn fcmp(&mut self, op: RealPredicate, lhs: Self::Value, rhs: Self::Value) -> Self::Value; + /// Returns `-1` if `lhs < rhs`, `0` if `lhs == rhs`, and `1` if `lhs > rhs`. + // FIXME: Move the default implementation from `codegen_scalar_binop` into this method and + // remove the `Option` return once LLVM 20 is the minimum version. + fn three_way_compare( + &mut self, + _ty: Ty<'tcx>, + _lhs: Self::Value, + _rhs: Self::Value, + ) -> Option<Self::Value> { + None + } + fn memcpy( &mut self, dst: Self::Value, |