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add codegen test for trailing_zeros comparison #114850

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Aug 16, 2023
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add codegen test for trailing_zeros comparison #114850

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22 changes: 22 additions & 0 deletions tests/codegen/trailing_zeros.rs
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// compile-flags: -O
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// min-llvm-version: 17

#![crate_type = "lib"]

// CHECK-LABEL: @trailing_zeros_ge
#[no_mangle]
pub fn trailing_zeros_ge(val: u32) -> bool {
// CHECK: %[[AND:.*]] = and i32 %val, 7
// CHECK: %[[ICMP:.*]] = icmp eq i32 %[[AND]], 0
// CHECK: ret i1 %[[ICMP]]
val.trailing_zeros() >= 3
}

// CHECK-LABEL: @trailing_zeros_gt
#[no_mangle]
pub fn trailing_zeros_gt(val: u64) -> bool {
// CHECK: %[[AND:.*]] = and i64 %val, 15
// CHECK: %[[ICMP:.*]] = icmp eq i64 %[[AND]], 0
// CHECK: ret i1 %[[ICMP]]
val.trailing_zeros() > 3
}
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