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Auto merge of #114850 - khei4:khei4/trailing_zero_codegen, r=nikic

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add codegen test for `trailing_zeros` comparison

This PR add codegen test for
https://github.com/rust-lang/rust/issues/107554#issuecomment-1677369236

Fixes #107554.
This commit is contained in:
bors 2023-08-16 11:07:13 +00:00
commit 1ec628d7fa
1 changed files with 22 additions and 0 deletions
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tests/codegen/trailing_zeros.rs Normal file
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// compile-flags: -O
// 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
}