mir-opt diff tests for 64/32 bit targets doesn't render as diff in github

[oli-obk]

mir-opt tests have a diff mode where the changes of a specific optimization are shown as a .diff file which is rendered as a diff by most tools. For 32/64 bit tests we ended up adding a postfix to the file name (which comes after the .diff), and that breaks the tool support. We should change all these tests file-names so they end with .diff again.

We should change both

rust/src/tools/compiletest/src/runtest.rs

Line 3172 in 5fff382

expected_file = format!("{}{}", test_name, bit_width);

and

rust/src/tools/compiletest/src/runtest.rs

Line 3190 in 5fff382

expected_file = format!("{}{}", test_name, bit_width);

to insert the bitsize before the .diff or .mir respectively.

After you've run --bless for both 32 bit and 64 bit, you also need to change

rust/src/tools/compiletest/src/runtest.rs

Line 3147 in 5fff382

glob(&format!("{}/{}.*.mir{}", test_dir.display(), test_crate, bit_width)).unwrap()

and

rust/src/tools/compiletest/src/runtest.rs

Line 3152 in 5fff382

glob(&format!("{}/{}.*.diff{}", test_dir.display(), test_crate, bit_width)).unwrap()

Do not do the last step before having run --bless, otherwise you'll have to figure out what files to rename and do it manually. This way you get --bless to do it for you.

cc @rust-lang/wg-mir-opt

[aDotInTheVoid]

I'm working on this.