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| author | bors <bors@rust-lang.org> | 2020-12-26 06:43:51 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2020-12-26 06:43:51 +0000 |
| commit | 733cb54d18c6c3bbd8dfcd6184cdf678bd64bd0e (patch) | |
| tree | 7d3ac4690369953409e35bfde95c56d197d688f9 /src/test/codegen/slice-ref-equality.rs | |
| parent | 1f5bc176b0e54a8e464704adcd7e571700207fe9 (diff) | |
| download | rust-733cb54d18c6c3bbd8dfcd6184cdf678bd64bd0e.tar.gz rust-733cb54d18c6c3bbd8dfcd6184cdf678bd64bd0e.zip | |
Remove pointer comparison from slice equality
This resurrects #71735. Fixes #71602, helps with #80140. r? `@Mark-Simulacrum`
Diffstat (limited to 'src/test/codegen/slice-ref-equality.rs')
| -rw-r--r-- | src/test/codegen/slice-ref-equality.rs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/test/codegen/slice-ref-equality.rs b/src/test/codegen/slice-ref-equality.rs new file mode 100644 index 00000000000..acc7879e7b1 --- /dev/null +++ b/src/test/codegen/slice-ref-equality.rs @@ -0,0 +1,16 @@ +// compile-flags: -C opt-level=3 + +#![crate_type = "lib"] + +// #71602: check that slice equality just generates a single bcmp + +// CHECK-LABEL: @is_zero_slice +#[no_mangle] +pub fn is_zero_slice(data: &[u8; 4]) -> bool { + // CHECK: start: + // 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; 4] +} |