Nightly Compile Time Regression (06/23 to 07/01)

[steffengy]

I noticed a pretty huge compile time regression from
rustc 1.11.0-nightly (ad7fe6521 2016-06-23) to rustc 1.11.0-nightly (01411937f 2016-07-01).

- time: 7.904; rss: 120MB   expansion
+ time: 84.063; rss: 121MB  expansion

Compiling the same project, results in a pretty big increase in expansion time.
I could notice similar (about 11x) slow-downs on my windows installation and
reproduced it on a fresh ubuntu.

All instructions used can be found here: https://gist.github.com/steffengy/ab3660ec9d6eecb0fc38e7d536d9e7ef

[nagisa]

cc @jseyfried could be your macro-related changes.

[steffengy]

It's pretty macro-heavy, so that would actually make sense.

[alexcrichton]

triage: I-nominated

[jonas-schievink]

cc me (want to check this on my assembler macro)

[Aatch]

The project in question is steffengy/pesty-php, for reference.

[jseyfried]

I'll look into it.

[steffengy]

@jseyfried bisect shows that the first bad commit is 5bf7970

[jseyfried]

@steffengy Thanks for bisecting -- I fixed this in #34652.