Rollup merge of #136543 - RalfJung:round-ties-even, r=tgross35

intrinsics: unify rint, roundeven, nearbyint in a single round_ties_even intrinsic

LLVM has three intrinsics here that all do the same thing (when used in the default FP environment). There's no reason Rust needs to copy that historically-grown mess -- let's just have one intrinsic and leave it up to the LLVM backend to decide how to lower that.

Suggested by `@hanna-kruppe` in https://github.com/rust-lang/rust/issues/136459; Cc `@tgross35`

try-job: test-various

13 files changed, 127 insertions, 208 deletions

diff --git a/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs b/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
index 26f14532b45..4d9bed8652c 100644
--- a/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
+++ b/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
@@ -340,14 +340,10 @@ fn codegen_float_intrinsic_call<'tcx>(
         sym::ceilf64 => ("ceil", 1, fx.tcx.types.f64, types::F64),
         sym::truncf32 => ("truncf", 1, fx.tcx.types.f32, types::F32),
         sym::truncf64 => ("trunc", 1, fx.tcx.types.f64, types::F64),
-        sym::rintf32 => ("rintf", 1, fx.tcx.types.f32, types::F32),
-        sym::rintf64 => ("rint", 1, fx.tcx.types.f64, types::F64),
+        sym::round_ties_even_f32 => ("rintf", 1, fx.tcx.types.f32, types::F32),
+        sym::round_ties_even_f64 => ("rint", 1, fx.tcx.types.f64, types::F64),
         sym::roundf32 => ("roundf", 1, fx.tcx.types.f32, types::F32),
         sym::roundf64 => ("round", 1, fx.tcx.types.f64, types::F64),
-        sym::roundevenf32 => ("roundevenf", 1, fx.tcx.types.f32, types::F32),
-        sym::roundevenf64 => ("roundeven", 1, fx.tcx.types.f64, types::F64),
-        sym::nearbyintf32 => ("nearbyintf", 1, fx.tcx.types.f32, types::F32),
-        sym::nearbyintf64 => ("nearbyint", 1, fx.tcx.types.f64, types::F64),
         sym::sinf32 => ("sinf", 1, fx.tcx.types.f32, types::F32),
         sym::sinf64 => ("sin", 1, fx.tcx.types.f64, types::F64),
         sym::cosf32 => ("cosf", 1, fx.tcx.types.f32, types::F32),
@@ -399,8 +395,8 @@ fn codegen_float_intrinsic_call<'tcx>(
         | sym::ceilf64
         | sym::truncf32
         | sym::truncf64
-        | sym::nearbyintf32
-        | sym::nearbyintf64
+        | sym::round_ties_even_f32
+        | sym::round_ties_even_f64
         | sym::sqrtf32
         | sym::sqrtf64 => {
             let val = match intrinsic {
@@ -408,7 +404,9 @@ fn codegen_float_intrinsic_call<'tcx>(
                 sym::floorf32 | sym::floorf64 => fx.bcx.ins().floor(args[0]),
                 sym::ceilf32 | sym::ceilf64 => fx.bcx.ins().ceil(args[0]),
                 sym::truncf32 | sym::truncf64 => fx.bcx.ins().trunc(args[0]),
-                sym::nearbyintf32 | sym::nearbyintf64 => fx.bcx.ins().nearest(args[0]),
+                sym::round_ties_even_f32 | sym::round_ties_even_f64 => {
+                    fx.bcx.ins().nearest(args[0])
+                }
                 sym::sqrtf32 | sym::sqrtf64 => fx.bcx.ins().sqrt(args[0]),
                 _ => unreachable!(),
             };
diff --git a/compiler/rustc_codegen_gcc/src/intrinsic/mod.rs b/compiler/rustc_codegen_gcc/src/intrinsic/mod.rs
index 433868e238a..f8672c07299 100644
--- a/compiler/rustc_codegen_gcc/src/intrinsic/mod.rs
+++ b/compiler/rustc_codegen_gcc/src/intrinsic/mod.rs
@@ -84,14 +84,11 @@ fn get_simple_intrinsic<'gcc, 'tcx>(
         sym::ceilf64 => "ceil",
         sym::truncf32 => "truncf",
         sym::truncf64 => "trunc",
-        sym::rintf32 => "rintf",
-        sym::rintf64 => "rint",
-        sym::nearbyintf32 => "nearbyintf",
-        sym::nearbyintf64 => "nearbyint",
+        // We match the LLVM backend and lower this to `rint`.
+        sym::round_ties_even_f32 => "rintf",
+        sym::round_ties_even_f64 => "rint",
         sym::roundf32 => "roundf",
         sym::roundf64 => "round",
-        sym::roundevenf32 => "roundevenf",
-        sym::roundevenf64 => "roundeven",
         sym::abort => "abort",
         _ => return None,
     };
diff --git a/compiler/rustc_codegen_llvm/src/intrinsic.rs b/compiler/rustc_codegen_llvm/src/intrinsic.rs
index f68365f6c69..dfbb5bc1731 100644
--- a/compiler/rustc_codegen_llvm/src/intrinsic.rs
+++ b/compiler/rustc_codegen_llvm/src/intrinsic.rs
@@ -127,15 +127,14 @@ fn get_simple_intrinsic<'ll>(
         sym::truncf64 => "llvm.trunc.f64",
         sym::truncf128 => "llvm.trunc.f128",
 
-        sym::rintf16 => "llvm.rint.f16",
-        sym::rintf32 => "llvm.rint.f32",
-        sym::rintf64 => "llvm.rint.f64",
-        sym::rintf128 => "llvm.rint.f128",
-
-        sym::nearbyintf16 => "llvm.nearbyint.f16",
-        sym::nearbyintf32 => "llvm.nearbyint.f32",
-        sym::nearbyintf64 => "llvm.nearbyint.f64",
-        sym::nearbyintf128 => "llvm.nearbyint.f128",
+        // We could use any of `rint`, `nearbyint`, or `roundeven`
+        // for this -- they are all identical in semantics when
+        // assuming the default FP environment.
+        // `rint` is what we used for $forever.
+        sym::round_ties_even_f16 => "llvm.rint.f16",
+        sym::round_ties_even_f32 => "llvm.rint.f32",
+        sym::round_ties_even_f64 => "llvm.rint.f64",
+        sym::round_ties_even_f128 => "llvm.rint.f128",
 
         sym::roundf16 => "llvm.round.f16",
         sym::roundf32 => "llvm.round.f32",
@@ -144,11 +143,6 @@ fn get_simple_intrinsic<'ll>(
 
         sym::ptr_mask => "llvm.ptrmask",
 
-        sym::roundevenf16 => "llvm.roundeven.f16",
-        sym::roundevenf32 => "llvm.roundeven.f32",
-        sym::roundevenf64 => "llvm.roundeven.f64",
-        sym::roundevenf128 => "llvm.roundeven.f128",
-
         _ => return None,
     };
     Some(cx.get_intrinsic(llvm_name))
diff --git a/compiler/rustc_hir_analysis/src/check/intrinsic.rs b/compiler/rustc_hir_analysis/src/check/intrinsic.rs
index 08e0e52a492..d468027602c 100644
--- a/compiler/rustc_hir_analysis/src/check/intrinsic.rs
+++ b/compiler/rustc_hir_analysis/src/check/intrinsic.rs
@@ -140,6 +140,10 @@ pub fn intrinsic_operation_unsafety(tcx: TyCtxt<'_>, intrinsic_id: LocalDefId) -
         | sym::fmul_algebraic
         | sym::fdiv_algebraic
         | sym::frem_algebraic
+        | sym::round_ties_even_f16
+        | sym::round_ties_even_f32
+        | sym::round_ties_even_f64
+        | sym::round_ties_even_f128
         | sym::const_eval_select => hir::Safety::Safe,
         _ => hir::Safety::Unsafe,
     };
@@ -416,26 +420,16 @@ pub fn check_intrinsic_type(
             sym::truncf64 => (0, 0, vec![tcx.types.f64], tcx.types.f64),
             sym::truncf128 => (0, 0, vec![tcx.types.f128], tcx.types.f128),
 
-            sym::rintf16 => (0, 0, vec![tcx.types.f16], tcx.types.f16),
-            sym::rintf32 => (0, 0, vec![tcx.types.f32], tcx.types.f32),
-            sym::rintf64 => (0, 0, vec![tcx.types.f64], tcx.types.f64),
-            sym::rintf128 => (0, 0, vec![tcx.types.f128], tcx.types.f128),
-
-            sym::nearbyintf16 => (0, 0, vec![tcx.types.f16], tcx.types.f16),
-            sym::nearbyintf32 => (0, 0, vec![tcx.types.f32], tcx.types.f32),
-            sym::nearbyintf64 => (0, 0, vec![tcx.types.f64], tcx.types.f64),
-            sym::nearbyintf128 => (0, 0, vec![tcx.types.f128], tcx.types.f128),
+            sym::round_ties_even_f16 => (0, 0, vec![tcx.types.f16], tcx.types.f16),
+            sym::round_ties_even_f32 => (0, 0, vec![tcx.types.f32], tcx.types.f32),
+            sym::round_ties_even_f64 => (0, 0, vec![tcx.types.f64], tcx.types.f64),
+            sym::round_ties_even_f128 => (0, 0, vec![tcx.types.f128], tcx.types.f128),
 
             sym::roundf16 => (0, 0, vec![tcx.types.f16], tcx.types.f16),
             sym::roundf32 => (0, 0, vec![tcx.types.f32], tcx.types.f32),
             sym::roundf64 => (0, 0, vec![tcx.types.f64], tcx.types.f64),
             sym::roundf128 => (0, 0, vec![tcx.types.f128], tcx.types.f128),
 
-            sym::roundevenf16 => (0, 0, vec![tcx.types.f16], tcx.types.f16),
-            sym::roundevenf32 => (0, 0, vec![tcx.types.f32], tcx.types.f32),
-            sym::roundevenf64 => (0, 0, vec![tcx.types.f64], tcx.types.f64),
-            sym::roundevenf128 => (0, 0, vec![tcx.types.f128], tcx.types.f128),
-
             sym::volatile_load | sym::unaligned_volatile_load => {
                 (1, 0, vec![Ty::new_imm_ptr(tcx, param(0))], param(0))
             }
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index d4d435d9b74..10c79b1be82 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -1367,10 +1367,6 @@ symbols! {
         native_link_modifiers_whole_archive,
         natvis_file,
         ne,
-        nearbyintf128,
-        nearbyintf16,
-        nearbyintf32,
-        nearbyintf64,
         needs_allocator,
         needs_drop,
         needs_panic_runtime,
@@ -1688,20 +1684,16 @@ symbols! {
         return_position_impl_trait_in_trait,
         return_type_notation,
         rhs,
-        rintf128,
-        rintf16,
-        rintf32,
-        rintf64,
         riscv_target_feature,
         rlib,
         ropi,
         ropi_rwpi: "ropi-rwpi",
         rotate_left,
         rotate_right,
-        roundevenf128,
-        roundevenf16,
-        roundevenf32,
-        roundevenf64,
+        round_ties_even_f128,
+        round_ties_even_f16,
+        round_ties_even_f32,
+        round_ties_even_f64,
         roundf128,
         roundf16,
         roundf32,
diff --git a/library/core/src/intrinsics/mod.rs b/library/core/src/intrinsics/mod.rs
index e2ab9be2bd2..ae2b3b92b82 100644
--- a/library/core/src/intrinsics/mod.rs
+++ b/library/core/src/intrinsics/mod.rs
@@ -2731,110 +2731,124 @@ pub unsafe fn truncf128(_x: f128) -> f128 {
     unreachable!()
 }
 
-/// Returns the nearest integer to an `f16`. Changing the rounding mode is not possible in Rust,
-/// so this rounds half-way cases to the number with an even least significant digit.
-///
-/// May raise an inexact floating-point exception if the argument is not an integer.
-/// However, Rust assumes floating-point exceptions cannot be observed, so these exceptions
-/// cannot actually be utilized from Rust code.
-/// In other words, this intrinsic is equivalent in behavior to `nearbyintf16` and `roundevenf16`.
+/// Returns the nearest integer to an `f16`. Rounds half-way cases to the number with an even
+/// least significant digit.
 ///
 /// The stabilized version of this intrinsic is
 /// [`f16::round_ties_even`](../../std/primitive.f16.html#method.round_ties_even)
 #[rustc_intrinsic]
 #[rustc_intrinsic_must_be_overridden]
 #[rustc_nounwind]
-pub unsafe fn rintf16(_x: f16) -> f16 {
+#[cfg(not(bootstrap))]
+pub fn round_ties_even_f16(_x: f16) -> f16 {
     unreachable!()
 }
-/// Returns the nearest integer to an `f32`. Changing the rounding mode is not possible in Rust,
-/// so this rounds half-way cases to the number with an even least significant digit.
-///
-/// May raise an inexact floating-point exception if the argument is not an integer.
-/// However, Rust assumes floating-point exceptions cannot be observed, so these exceptions
-/// cannot actually be utilized from Rust code.
-/// In other words, this intrinsic is equivalent in behavior to `nearbyintf32` and `roundevenf32`.
+
+/// To be removed on next bootstrap bump.
+#[cfg(bootstrap)]
+pub fn round_ties_even_f16(x: f16) -> f16 {
+    #[rustc_intrinsic]
+    #[rustc_intrinsic_must_be_overridden]
+    #[rustc_nounwind]
+    unsafe fn rintf16(_x: f16) -> f16 {
+        unreachable!()
+    }
+
+    // SAFETY: this intrinsic isn't actually unsafe
+    unsafe { rintf16(x) }
+}
+
+/// Returns the nearest integer to an `f32`. Rounds half-way cases to the number with an even
+/// least significant digit.
 ///
 /// The stabilized version of this intrinsic is
 /// [`f32::round_ties_even`](../../std/primitive.f32.html#method.round_ties_even)
 #[rustc_intrinsic]
 #[rustc_intrinsic_must_be_overridden]
 #[rustc_nounwind]
-pub unsafe fn rintf32(_x: f32) -> f32 {
+#[cfg(not(bootstrap))]
+pub fn round_ties_even_f32(_x: f32) -> f32 {
     unreachable!()
 }
-/// Returns the nearest integer to an `f64`. Changing the rounding mode is not possible in Rust,
-/// so this rounds half-way cases to the number with an even least significant digit.
-///
-/// May raise an inexact floating-point exception if the argument is not an integer.
-/// However, Rust assumes floating-point exceptions cannot be observed, so these exceptions
-/// cannot actually be utilized from Rust code.
-/// In other words, this intrinsic is equivalent in behavior to `nearbyintf64` and `roundevenf64`.
-///
-/// The stabilized version of this intrinsic is
-/// [`f64::round_ties_even`](../../std/primitive.f64.html#method.round_ties_even)
-#[rustc_intrinsic]
-#[rustc_intrinsic_must_be_overridden]
-#[rustc_nounwind]
-pub unsafe fn rintf64(_x: f64) -> f64 {
-    unreachable!()
+
+/// To be removed on next bootstrap bump.
+#[cfg(bootstrap)]
+pub fn round_ties_even_f32(x: f32) -> f32 {
+    #[rustc_intrinsic]
+    #[rustc_intrinsic_must_be_overridden]
+    #[rustc_nounwind]
+    unsafe fn rintf32(_x: f32) -> f32 {
+        unreachable!()
+    }
+
+    // SAFETY: this intrinsic isn't actually unsafe
+    unsafe { rintf32(x) }
 }
-/// Returns the nearest integer to an `f128`. Changing the rounding mode is not possible in Rust,
-/// so this rounds half-way cases to the number with an even least significant digit.
-///
-/// May raise an inexact floating-point exception if the argument is not an integer.
-/// However, Rust assumes floating-point exceptions cannot be observed, so these exceptions
-/// cannot actually be utilized from Rust code.
-/// In other words, this intrinsic is equivalent in behavior to `nearbyintf128` and `roundevenf128`.
+
+/// Provided for compatibility with stdarch. DO NOT USE.
+#[inline(always)]
+pub unsafe fn rintf32(x: f32) -> f32 {
+    round_ties_even_f32(x)
+}
+
+/// Returns the nearest integer to an `f64`. Rounds half-way cases to the number with an even
+/// least significant digit.
 ///
 /// The stabilized version of this intrinsic is
-/// [`f128::round_ties_even`](../../std/primitive.f128.html#method.round_ties_even)
+/// [`f64::round_ties_even`](../../std/primitive.f64.html#method.round_ties_even)
 #[rustc_intrinsic]
 #[rustc_intrinsic_must_be_overridden]
 #[rustc_nounwind]
-pub unsafe fn rintf128(_x: f128) -> f128 {
+#[cfg(not(bootstrap))]
+pub fn round_ties_even_f64(_x: f64) -> f64 {
     unreachable!()
 }
 
-/// Returns the nearest integer to an `f16`. Changing the rounding mode is not possible in Rust,
-/// so this rounds half-way cases to the number with an even least significant digit.
-///
-/// This intrinsic does not have a stable counterpart.
-#[rustc_intrinsic]
-#[rustc_intrinsic_must_be_overridden]
-#[rustc_nounwind]
-pub unsafe fn nearbyintf16(_x: f16) -> f16 {
-    unreachable!()
+/// To be removed on next bootstrap bump.
+#[cfg(bootstrap)]
+pub fn round_ties_even_f64(x: f64) -> f64 {
+    #[rustc_intrinsic]
+    #[rustc_intrinsic_must_be_overridden]
+    #[rustc_nounwind]
+    unsafe fn rintf64(_x: f64) -> f64 {
+        unreachable!()
+    }
+
+    // SAFETY: this intrinsic isn't actually unsafe
+    unsafe { rintf64(x) }
 }
-/// Returns the nearest integer to an `f32`. Changing the rounding mode is not possible in Rust,
-/// so this rounds half-way cases to the number with an even least significant digit.
-///
-/// This intrinsic does not have a stable counterpart.
-#[rustc_intrinsic]
-#[rustc_intrinsic_must_be_overridden]
-#[rustc_nounwind]
-pub unsafe fn nearbyintf32(_x: f32) -> f32 {
-    unreachable!()
+
+/// Provided for compatibility with stdarch. DO NOT USE.
+#[inline(always)]
+pub unsafe fn rintf64(x: f64) -> f64 {
+    round_ties_even_f64(x)
 }
-/// Returns the nearest integer to an `f64`. Changing the rounding mode is not possible in Rust,
-/// so this rounds half-way cases to the number with an even least significant digit.
+
+/// Returns the nearest integer to an `f128`. Rounds half-way cases to the number with an even
+/// least significant digit.
 ///
-/// This intrinsic does not have a stable counterpart.
+/// The stabilized version of this intrinsic is
+/// [`f128::round_ties_even`](../../std/primitive.f128.html#method.round_ties_even)
 #[rustc_intrinsic]
 #[rustc_intrinsic_must_be_overridden]
 #[rustc_nounwind]
-pub unsafe fn nearbyintf64(_x: f64) -> f64 {
+#[cfg(not(bootstrap))]
+pub fn round_ties_even_f128(_x: f128) -> f128 {
     unreachable!()
 }
-/// Returns the nearest integer to an `f128`. Changing the rounding mode is not possible in Rust,
-/// so this rounds half-way cases to the number with an even least significant digit.
-///
-/// This intrinsic does not have a stable counterpart.
-#[rustc_intrinsic]
-#[rustc_intrinsic_must_be_overridden]
-#[rustc_nounwind]
-pub unsafe fn nearbyintf128(_x: f128) -> f128 {
-    unreachable!()
+
+/// To be removed on next bootstrap bump.
+#[cfg(bootstrap)]
+pub fn round_ties_even_f128(x: f128) -> f128 {
+    #[rustc_intrinsic]
+    #[rustc_intrinsic_must_be_overridden]
+    #[rustc_nounwind]
+    unsafe fn rintf128(_x: f128) -> f128 {
+        unreachable!()
+    }
+
+    // SAFETY: this intrinsic isn't actually unsafe
+    unsafe { rintf128(x) }
 }
 
 /// Returns the nearest integer to an `f16`. Rounds half-way cases away from zero.
@@ -2878,47 +2892,6 @@ pub unsafe fn roundf128(_x: f128) -> f128 {
     unreachable!()
 }
 
-/// Returns the nearest integer to an `f16`. Rounds half-way cases to the number
-/// with an even least significant digit.
-///
-/// This intrinsic does not have a stable counterpart.
-#[rustc_intrinsic]
-#[rustc_intrinsic_must_be_overridden]
-#[rustc_nounwind]
-pub unsafe fn roundevenf16(_x: f16) -> f16 {
-    unreachable!()
-}
-/// Returns the nearest integer to an `f32`. Rounds half-way cases to the number
-/// with an even least significant digit.
-///
-/// This intrinsic does not have a stable counterpart.
-#[rustc_intrinsic]
-#[rustc_intrinsic_must_be_overridden]
-#[rustc_nounwind]
-pub unsafe fn roundevenf32(_x: f32) -> f32 {
-    unreachable!()
-}
-/// Returns the nearest integer to an `f64`. Rounds half-way cases to the number
-/// with an even least significant digit.
-///
-/// This intrinsic does not have a stable counterpart.
-#[rustc_intrinsic]
-#[rustc_intrinsic_must_be_overridden]
-#[rustc_nounwind]
-pub unsafe fn roundevenf64(_x: f64) -> f64 {
-    unreachable!()
-}
-/// Returns the nearest integer to an `f128`. Rounds half-way cases to the number
-/// with an even least significant digit.
-///
-/// This intrinsic does not have a stable counterpart.
-#[rustc_intrinsic]
-#[rustc_intrinsic_must_be_overridden]
-#[rustc_nounwind]
-pub unsafe fn roundevenf128(_x: f128) -> f128 {
-    unreachable!()
-}
-
 /// Float addition that allows optimizations based on algebraic rules.
 /// May assume inputs are finite.
 ///
diff --git a/library/std/src/f128.rs b/library/std/src/f128.rs
index 14ce2b69ca4..974514c9c45 100644
--- a/library/std/src/f128.rs
+++ b/library/std/src/f128.rs
@@ -126,7 +126,7 @@ impl f128 {
     #[unstable(feature = "f128", issue = "116909")]
     #[must_use = "method returns a new number and does not mutate the original value"]
     pub fn round_ties_even(self) -> f128 {
-        unsafe { intrinsics::rintf128(self) }
+        intrinsics::round_ties_even_f128(self)
     }
 
     /// Returns the integer part of `self`.
diff --git a/library/std/src/f16.rs b/library/std/src/f16.rs
index 0af69dff05a..c3b51bf31de 100644
--- a/library/std/src/f16.rs
+++ b/library/std/src/f16.rs
@@ -126,7 +126,7 @@ impl f16 {
     #[unstable(feature = "f16", issue = "116909")]
     #[must_use = "method returns a new number and does not mutate the original value"]
     pub fn round_ties_even(self) -> f16 {
-        unsafe { intrinsics::rintf16(self) }
+        intrinsics::round_ties_even_f16(self)
     }
 
     /// Returns the integer part of `self`.
diff --git a/library/std/src/f32.rs b/library/std/src/f32.rs
index 295eee8700a..19fb24c8ee2 100644
--- a/library/std/src/f32.rs
+++ b/library/std/src/f32.rs
@@ -122,7 +122,7 @@ impl f32 {
     #[stable(feature = "round_ties_even", since = "1.77.0")]
     #[inline]
     pub fn round_ties_even(self) -> f32 {
-        unsafe { intrinsics::rintf32(self) }
+        intrinsics::round_ties_even_f32(self)
     }
 
     /// Returns the integer part of `self`.
diff --git a/library/std/src/f64.rs b/library/std/src/f64.rs
index 0d713ecbc73..f1c3cb56127 100644
--- a/library/std/src/f64.rs
+++ b/library/std/src/f64.rs
@@ -122,7 +122,7 @@ impl f64 {
     #[stable(feature = "round_ties_even", since = "1.77.0")]
     #[inline]
     pub fn round_ties_even(self) -> f64 {
-        unsafe { intrinsics::rintf64(self) }
+        intrinsics::round_ties_even_f64(self)
     }
 
     /// Returns the integer part of `self`.
diff --git a/src/tools/miri/src/intrinsics/mod.rs b/src/tools/miri/src/intrinsics/mod.rs
index bce78adcaea..0faad0f7621 100644
--- a/src/tools/miri/src/intrinsics/mod.rs
+++ b/src/tools/miri/src/intrinsics/mod.rs
@@ -145,7 +145,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(Scalar::from_bool(branch), dest)?;
             }
 
-            "floorf16" | "ceilf16" | "truncf16" | "roundf16" | "rintf16" => {
+            "floorf16" | "ceilf16" | "truncf16" | "roundf16" | "round_ties_even_f16" => {
                 let [f] = check_arg_count(args)?;
                 let f = this.read_scalar(f)?.to_f16()?;
                 let mode = match intrinsic_name {
@@ -153,14 +153,14 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     "ceilf16" => Round::TowardPositive,
                     "truncf16" => Round::TowardZero,
                     "roundf16" => Round::NearestTiesToAway,
-                    "rintf16" => Round::NearestTiesToEven,
+                    "round_ties_even_f16" => Round::NearestTiesToEven,
                     _ => bug!(),
                 };
                 let res = f.round_to_integral(mode).value;
                 let res = this.adjust_nan(res, &[f]);
                 this.write_scalar(res, dest)?;
             }
-            "floorf32" | "ceilf32" | "truncf32" | "roundf32" | "rintf32" => {
+            "floorf32" | "ceilf32" | "truncf32" | "roundf32" | "round_ties_even_f32" => {
                 let [f] = check_arg_count(args)?;
                 let f = this.read_scalar(f)?.to_f32()?;
                 let mode = match intrinsic_name {
@@ -168,14 +168,14 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     "ceilf32" => Round::TowardPositive,
                     "truncf32" => Round::TowardZero,
                     "roundf32" => Round::NearestTiesToAway,
-                    "rintf32" => Round::NearestTiesToEven,
+                    "round_ties_even_f32" => Round::NearestTiesToEven,
                     _ => bug!(),
                 };
                 let res = f.round_to_integral(mode).value;
                 let res = this.adjust_nan(res, &[f]);
                 this.write_scalar(res, dest)?;
             }
-            "floorf64" | "ceilf64" | "truncf64" | "roundf64" | "rintf64" => {
+            "floorf64" | "ceilf64" | "truncf64" | "roundf64" | "round_ties_even_f64" => {
                 let [f] = check_arg_count(args)?;
                 let f = this.read_scalar(f)?.to_f64()?;
                 let mode = match intrinsic_name {
@@ -183,14 +183,14 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     "ceilf64" => Round::TowardPositive,
                     "truncf64" => Round::TowardZero,
                     "roundf64" => Round::NearestTiesToAway,
-                    "rintf64" => Round::NearestTiesToEven,
+                    "round_ties_even_f64" => Round::NearestTiesToEven,
                     _ => bug!(),
                 };
                 let res = f.round_to_integral(mode).value;
                 let res = this.adjust_nan(res, &[f]);
                 this.write_scalar(res, dest)?;
             }
-            "floorf128" | "ceilf128" | "truncf128" | "roundf128" | "rintf128" => {
+            "floorf128" | "ceilf128" | "truncf128" | "roundf128" | "round_ties_even_f128" => {
                 let [f] = check_arg_count(args)?;
                 let f = this.read_scalar(f)?.to_f128()?;
                 let mode = match intrinsic_name {
@@ -198,7 +198,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     "ceilf128" => Round::TowardPositive,
                     "truncf128" => Round::TowardZero,
                     "roundf128" => Round::NearestTiesToAway,
-                    "rintf128" => Round::NearestTiesToEven,
+                    "round_ties_even_f128" => Round::NearestTiesToEven,
                     _ => bug!(),
                 };
                 let res = f.round_to_integral(mode).value;
diff --git a/tests/codegen/intrinsics/nearby.rs b/tests/codegen/intrinsics/nearby.rs
deleted file mode 100644
index 520fe2f1886..00000000000
--- a/tests/codegen/intrinsics/nearby.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-#![crate_type = "lib"]
-#![feature(core_intrinsics)]
-
-use std::intrinsics;
-
-// CHECK-LABEL: @nearbyintf32
-#[no_mangle]
-pub unsafe fn nearbyintf32(a: f32) -> f32 {
-    // CHECK: llvm.nearbyint.f32
-    intrinsics::nearbyintf32(a)
-}
-
-// CHECK-LABEL: @nearbyintf64
-#[no_mangle]
-pub unsafe fn nearbyintf64(a: f64) -> f64 {
-    // CHECK: llvm.nearbyint.f64
-    intrinsics::nearbyintf64(a)
-}
diff --git a/tests/ui/intrinsics/intrinsic-nearby.rs b/tests/ui/intrinsics/intrinsic-nearby.rs
deleted file mode 100644
index 990ecfc2b70..00000000000
--- a/tests/ui/intrinsics/intrinsic-nearby.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-//@ run-pass
-#![feature(core_intrinsics)]
-
-use std::intrinsics::*;
-
-fn main() {
-    unsafe {
-        assert_eq!(nearbyintf32(5.234f32), 5f32);
-        assert_eq!(nearbyintf64(6.777f64), 7f64);
-    }
-}