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https://github.com/rust-lang/rust.git
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Andreas Liljeqvist
33 lines
865 B
Rust
33 lines
865 B
Rust
//@ revisions: X86_64 LA64
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//@ assembly-output: emit-asm
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//@ compile-flags: -C opt-level=3
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//
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//@ [X86_64] only-x86_64
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//@ [X86_64] compile-flags: -C target-cpu=znver4
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//@ [X86_64] compile-flags: -C llvm-args=-x86-asm-syntax=intel
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//
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//@ [LA64] only-loongarch64
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#![crate_type = "lib"]
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/// Verify `is_ascii` generates efficient code on different architectures:
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///
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/// - x86_64: Must NOT use `kshiftrd`/`kshiftrq` (broken AVX-512 auto-vectorization).
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/// Good version uses explicit SSE2 intrinsics (`pmovmskb`/`vpmovmskb`).
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///
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/// - loongarch64: Should use `vmskltz.b` instruction for the fast-path.
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// X86_64-LABEL: test_is_ascii
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// X86_64-NOT: kshiftrd
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// X86_64-NOT: kshiftrq
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// X86_64: {{vpor|por}}
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// X86_64: {{vpmovmskb|pmovmskb}}
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// LA64-LABEL: test_is_ascii
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// LA64: vmskltz.b
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#[no_mangle]
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pub fn test_is_ascii(s: &[u8]) -> bool {
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s.is_ascii()
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}
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