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

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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
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Trevor Gross 2025-02-23 14:30:25 -05:00 • committed by GitHub
commit a2bb4d748d
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13 changed files with 127 additions and 208 deletions
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16
compiler/rustc_span/src/symbol.rs
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@ -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,