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| author | Ryan Scott <ryan.gl.scott@gmail.com> | 2017-06-02 13:12:11 -0400 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2017-06-02 13:12:13 -0400 |
| commit | a786b136f48dfcf907dad55bcdbc4fcd247f2794 (patch) | |
| tree | 9c6abee43aa398fdd8168b1cb7bd2d3fb5e6bacf /compiler/codeGen/StgCmmClosure.hs | |
| parent | 811a2986475d88f73bb22b4600970039e1b582d6 (diff) | |
| download | haskell-a786b136f48dfcf907dad55bcdbc4fcd247f2794.tar.gz | |
Use lengthIs and friends in more places
While investigating #12545, I discovered several places in the code
that performed length-checks like so:
```
length ts == 4
```
This is not ideal, since the length of `ts` could be much longer than 4,
and we'd be doing way more work than necessary! There are already a slew
of helper functions in `Util` such as `lengthIs` that are designed to do
this efficiently, so I found every place where they ought to be used and
did just that. I also defined a couple more utility functions for list
length that were common patterns (e.g., `ltLength`).
Test Plan: ./validate
Reviewers: austin, hvr, goldfire, bgamari, simonmar
Reviewed By: bgamari, simonmar
Subscribers: goldfire, rwbarton, thomie
Differential Revision: https://phabricator.haskell.org/D3622
Diffstat (limited to 'compiler/codeGen/StgCmmClosure.hs')
| -rw-r--r-- | compiler/codeGen/StgCmmClosure.hs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/codeGen/StgCmmClosure.hs b/compiler/codeGen/StgCmmClosure.hs index 37572b7d4e..8eaee795a5 100644 --- a/compiler/codeGen/StgCmmClosure.hs +++ b/compiler/codeGen/StgCmmClosure.hs @@ -553,7 +553,7 @@ getCallMethod dflags _ id _ n_args v_args _cg_loc (Just (self_loop_id, block_id, args)) | gopt Opt_Loopification dflags , id == self_loop_id - , n_args - v_args == length args + , args `lengthIs` (n_args - v_args) -- If these patterns match then we know that: -- * loopification optimisation is turned on -- * function is performing a self-recursive call in a tail position |