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Refactor memchr to allow optimization

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This commit is contained in:
Dániel Buga 2020-09-20 14:46:07 +02:00
parent 5b9e886403
commit 89b8a97aea
4 changed files with 90 additions and 17 deletions
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62
src/test/codegen/issue-75659.rs Normal file
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@ -0,0 +1,62 @@
// This test checks that the call to memchr/slice_contains is optimized away
// when searching in small slices.
// compile-flags: -O
#![crate_type = "lib"]
// CHECK-LABEL: @foo1
#[no_mangle]
pub fn foo1(x: u8, data: &[u8; 1]) -> bool {
// CHECK-NOT: memchr
// CHECK-NOT: slice_contains
data.contains(&x)
}
// CHECK-LABEL: @foo2
#[no_mangle]
pub fn foo2(x: u8, data: &[u8; 2]) -> bool {
// CHECK-NOT: memchr
// CHECK-NOT: slice_contains
data.contains(&x)
}
// CHECK-LABEL: @foo3
#[no_mangle]
pub fn foo3(x: u8, data: &[u8; 3]) -> bool {
// CHECK-NOT: memchr
// CHECK-NOT: slice_contains
data.contains(&x)
}
// CHECK-LABEL: @foo4
#[no_mangle]
pub fn foo4(x: u8, data: &[u8; 4]) -> bool {
// CHECK-NOT: memchr
// CHECK-NOT: slice_contains
data.contains(&x)
}
// CHECK-LABEL: @foo8
#[no_mangle]
pub fn foo8(x: u8, data: &[u8; 8]) -> bool {
// CHECK-NOT: memchr
// CHECK-NOT: slice_contains
data.contains(&x)
}
// CHECK-LABEL: @foo8_i8
#[no_mangle]
pub fn foo8_i8(x: i8, data: &[i8; 8]) -> bool {
// CHECK-NOT: memchr
// CHECK-NOT: slice_contains
!data.contains(&x)
}
// Check that the general case isn't inlined
// CHECK-LABEL: @foo80
#[no_mangle]
pub fn foo80(x: u8, data: &[u8; 80]) -> bool {
// CHECK: call core::slice::memchr
data.contains(&x)
}