diff options
Diffstat (limited to 'src/test/codegen/slice-ref-equality.rs')
| -rw-r--r-- | src/test/codegen/slice-ref-equality.rs | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/src/test/codegen/slice-ref-equality.rs b/src/test/codegen/slice-ref-equality.rs index 1f99ac7342b..c06554ecdec 100644 --- a/src/test/codegen/slice-ref-equality.rs +++ b/src/test/codegen/slice-ref-equality.rs @@ -4,18 +4,31 @@ // #71602 reported a simple array comparison just generating a loop. // This was originally fixed by ensuring it generates a single bcmp, -// but we now generate it as a load instead. `is_zero_slice` was +// but we now generate it as a load+icmp instead. `is_zero_slice` was // tweaked to still test the case of comparison against a slice, // and `is_zero_array` tests the new array-specific behaviour. +// The optimization was then extended to short slice-to-array comparisons, +// so the first test here now has a long slice to still get the bcmp. -// CHECK-LABEL: @is_zero_slice +// CHECK-LABEL: @is_zero_slice_long #[no_mangle] -pub fn is_zero_slice(data: &[u8; 4]) -> bool { +pub fn is_zero_slice_long(data: &[u8; 456]) -> bool { // CHECK: : // CHECK-NEXT: %{{.+}} = getelementptr {{.+}} // CHECK-NEXT: %[[BCMP:.+]] = tail call i32 @{{bcmp|memcmp}}({{.+}}) // CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[BCMP]], 0 // CHECK-NEXT: ret i1 %[[EQ]] + &data[..] == [0; 456] +} + +// CHECK-LABEL: @is_zero_slice_short +#[no_mangle] +pub fn is_zero_slice_short(data: &[u8; 4]) -> bool { + // CHECK: : + // CHECK-NEXT: %[[PTR:.+]] = bitcast [4 x i8]* {{.+}} to i32* + // CHECK-NEXT: %[[LOAD:.+]] = load i32, i32* %[[PTR]], align 1 + // CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[LOAD]], 0 + // CHECK-NEXT: ret i1 %[[EQ]] &data[..] == [0; 4] } |