58c10c66c1
Lowers `mir::BinOp::Cmp` (`three_way_compare` intrinsic) to the corresponding
LLVM `llvm.{s,u}cmp.i8.*` intrinsics, added in LLVM 19.
28 lines
836 B
Rust
28 lines
836 B
Rust
//@ revisions: DEBUG OPTIM
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//@ [DEBUG] compile-flags: -C opt-level=0
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//@ [OPTIM] compile-flags: -C opt-level=3
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//@ compile-flags: -C no-prepopulate-passes
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//@ min-llvm-version: 20
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#![crate_type = "lib"]
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#![feature(core_intrinsics)]
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use std::intrinsics::three_way_compare;
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#[no_mangle]
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// CHECK-LABEL: @signed_cmp
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// CHECK-SAME: (i16{{.*}} %a, i16{{.*}} %b)
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pub fn signed_cmp(a: i16, b: i16) -> std::cmp::Ordering {
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// CHECK: %[[CMP:.+]] = call i8 @llvm.scmp.i8.i16(i16 %a, i16 %b)
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// CHECK-NEXT: ret i8 %[[CMP]]
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three_way_compare(a, b)
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}
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#[no_mangle]
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// CHECK-LABEL: @unsigned_cmp
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// CHECK-SAME: (i16{{.*}} %a, i16{{.*}} %b)
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pub fn unsigned_cmp(a: u16, b: u16) -> std::cmp::Ordering {
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// CHECK: %[[CMP:.+]] = call i8 @llvm.ucmp.i8.i16(i16 %a, i16 %b)
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// CHECK-NEXT: ret i8 %[[CMP]]
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three_way_compare(a, b)
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}
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