36 lines
966 B
Rust
36 lines
966 B
Rust
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// revisions: WIN LIN
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// [WIN] only-windows
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// [LIN] only-linux
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// assembly-output: emit-asm
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// compile-flags: --crate-type=lib -O -C llvm-args=-x86-asm-syntax=intel
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// min-llvm-version: 14
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// only-x86_64
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// ignore-sgx
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// ignore-debug
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#![feature(str_internals)]
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// CHECK-LABEL: is_ascii_simple_demo:
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#[no_mangle]
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pub fn is_ascii_simple_demo(bytes: &[u8]) -> bool {
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// Linux (System V): pointer is rdi; length is rsi
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// Windows: pointer is rcx; length is rdx.
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// CHECK-NOT: mov
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// CHECK-NOT: test
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// CHECK-NOT: cmp
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// CHECK: .[[LOOPHEAD:.+]]:
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// CHECK-NEXT: mov [[TEMP:.+]], [[LEN:rsi|rdx]]
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// CHECK-NEXT: sub [[LEN]], 1
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// CHECK-NEXT: jb .[[LOOPEXIT:.+]]
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// CHECK-NEXT: cmp byte ptr [{{rdi|rcx}} + [[TEMP]] - 1], 0
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// CHECK-NEXT: jns .[[LOOPHEAD]]
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// CHECK-NEXT: .[[LOOPEXIT]]:
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// CHECK-NEXT: test [[TEMP]], [[TEMP]]
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// CHECK-NEXT: sete al
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// CHECK-NEXT: ret
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core::slice::is_ascii_simple(bytes)
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}
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