bors 05a7f25cc4 Auto merge of #39456 - nagisa:mir-switchint-everywhere, r=nikomatsakis ... [MIR] SwitchInt Everywhere Something I've been meaning to do for a very long while. This PR essentially gets rid of 3 kinds of conditional branching and only keeps the most general one - `SwitchInt`. Primary benefits are such that dealing with MIR now does not involve dealing with 3 different ways to do conditional control flow. On the other hand, constructing a `SwitchInt` currently requires more code than what previously was necessary to build an equivalent `If` terminator. Something trivially "fixable" with some constructor methods somewhere (MIR needs stuff like that badly in general). Some timings (tl;dr: slightly faster^1 (unexpected), but also uses slightly more memory at peak (expected)): ^1: Not sure if the speed benefits are because of LLVM liking the generated code better or the compiler itself getting compiled better. Either way, its a net benefit. The CORE and SYNTAX timings done for compilation without optimisation. ``` AFTER: Building stage1 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu) Finished release [optimized] target(s) in 31.50 secs Finished release [optimized] target(s) in 31.42 secs Building stage1 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu) Finished release [optimized] target(s) in 439.56 secs Finished release [optimized] target(s) in 435.15 secs CORE: 99% (24.81 real, 0.13 kernel, 24.57 user); 358536k resident CORE: 99% (24.56 real, 0.15 kernel, 24.36 user); 359168k resident SYNTAX: 99% (49.98 real, 0.48 kernel, 49.42 user); 653416k resident SYNTAX: 99% (50.07 real, 0.58 kernel, 49.43 user); 653604k resident BEFORE: Building stage1 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu) Finished release [optimized] target(s) in 31.84 secs Building stage1 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu) Finished release [optimized] target(s) in 451.17 secs CORE: 99% (24.66 real, 0.20 kernel, 24.38 user); 351096k resident CORE: 99% (24.36 real, 0.17 kernel, 24.18 user); 352284k resident SYNTAX: 99% (52.24 real, 0.56 kernel, 51.66 user); 645544k resident SYNTAX: 99% (51.55 real, 0.48 kernel, 50.99 user); 646428k resident ``` cc @nikomatsakis @eddyb		2017-02-13 02:32:09 +00:00
..
archive_ro.rs	run rustfmt on librustc_llvm folder	2016-05-29 14:57:34 +05:30
build.rs	std: Remove cfg(cargobuild) annotations	2017-02-06 08:42:54 -08:00
Cargo.lock	[LLVM] Introduce a stable representation of DIFlags	2016-12-02 21:13:31 -05:00
Cargo.toml	[LLVM] Introduce a stable representation of DIFlags	2016-12-02 21:13:31 -05:00
diagnostic.rs	Don't assume llvm::StringRef is null terminated	2016-11-28 17:33:13 +01:00
ffi.rs	Auto merge of #39456 - nagisa:mir-switchint-everywhere, r=nikomatsakis	2017-02-13 02:32:09 +00:00
lib.rs	std: Remove cfg(cargobuild) annotations	2017-02-06 08:42:54 -08:00