[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 12 commits: Fix "build/elem" RULE.

Marge Bot gitlab at gitlab.haskell.org
Fri May 29 06:14:26 UTC 2020 


 Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC


Commits:
f10d11fa by Andreas Klebinger at 2020-05-29T01:38:42-04:00
Fix "build/elem" RULE.

An redundant constraint prevented the rule from matching.

Fixing this allows a call to elem on a known list to be translated
into a series of equality checks, and eventually a simple case
expression.

Surprisingly this seems to regress elem for strings. To avoid
this we now also allow foldrCString to inline and add an UTF8
variant. This results in elem being compiled to a tight
non-allocating loop over the primitive string literal which
performs a linear search.

In the process this commit adds UTF8 variants for some of the
functions in GHC.CString. This is required to make this work for
both ASCII and UTF8 strings.

There are also small tweaks to the CString related rules.
We now allow ourselfes the luxury to compare the folding function
via eqExpr, which helps to ensure the rule fires before we inline
foldrCString*. Together with a few changes to allow matching on both
the UTF8 and ASCII variants of the CString functions.

- - - - -
bbeb2389 by Ben Gamari at 2020-05-29T01:39:19-04:00
CoreToStg: Add Outputable ArgInfo instance

- - - - -
0e3361ca by Simon Peyton Jones at 2020-05-29T01:39:19-04:00
Make Lint check return type of a join point

Consider
   join x = rhs in body
It's important that the type of 'rhs' is the same as the type of
'body', but Lint wasn't checking that invariant.

Now it does!  This was exposed by investigation into !3113.

- - - - -
c49f7df0 by Simon Peyton Jones at 2020-05-29T01:39:19-04:00
Do not float join points in exprIsConApp_maybe

We hvae been making exprIsConApp_maybe cleverer in recent times:

    commit b78cc64e923716ac0512c299f42d4d0012306c05
    Date:   Thu Nov 15 17:14:31 2018 +0100
    Make constructor wrappers inline only during the final phase

    commit 7833cf407d1f608bebb1d38bb99d3035d8d735e6
    Date:   Thu Jan 24 17:58:50 2019 +0100
    Look through newtype wrappers (Trac #16254)

    commit c25b135ff5b9c69a90df0ccf51b04952c2dc6ee1
    Date:   Thu Feb 21 12:03:22 2019 +0000
    Fix exprIsConApp_maybe

But alas there was still a bug, now immortalised in
  Note [Don't float join points]
in SimpleOpt.

It's quite hard to trigger because it requires a dead
join point, but it came up when compiling Cabal
Cabal.Distribution.Fields.Lexer.hs, when working on
!3113.

Happily, the fix is extremly easy.  Finding the
bug was not so easy.

- - - - -
46720997 by Ben Gamari at 2020-05-29T01:39:19-04:00
Allow simplification through runRW#

Because runRW# inlines so late, we were previously able to do very
little simplification across it. For instance, given even a simple
program like

    case runRW# (\s -> let n = I# 42# in n) of
      I# n# -> f n#

we previously had no way to avoid the allocation of the I#.

This patch allows the simplifier to push strict contexts into the
continuation of a runRW# application, as explained in
in Note [Simplification of runRW#] in GHC.CoreToStg.Prep.

Fixes #15127.

Metric Increase:
    T9961
Metric Decrease:
    ManyConstructors

Co-Authored-By: Simon Peyton-Jone <simonpj at microsoft.com>

- - - - -
277c2f26 by Ben Gamari at 2020-05-29T01:39:55-04:00
Eta expand un-saturated primops

Now since we no longer try to predict CAFfyness we have no need for the
solution to #16846. Eta expanding unsaturated primop applications is
conceptually simpler, especially in the presence of levity polymorphism.

This essentially reverts cac8dc9f51e31e4c0a6cd9bc302f7e1bc7c03beb,
as suggested in #18079.

Closes #18079.

- - - - -
f44d7ae0 by Simon Jakobi at 2020-05-29T01:40:34-04:00
base: Scrap deprecation plan for Data.Monoid.{First,Last}

See the discussion on the libraries mailing list for context:

https://mail.haskell.org/pipermail/libraries/2020-April/030357.html

- - - - -
8b494895 by Jeremy Schlatter at 2020-05-29T01:41:12-04:00
Fix typo in documentation

- - - - -
998450f4 by Gleb Popov at 2020-05-29T01:41:53-04:00
Always define USE_PTHREAD_FOR_ITIMER for FreeBSD.

- - - - -
f9a513e0 by Alp Mestanogullari at 2020-05-29T01:42:36-04:00
hadrian: introduce 'install' target

Its logic is very simple. It `need`s the `binary-dist-dir` target
and runs suitable `configure` and `make install` commands for the
user. A new `--prefix` command line argument is introduced to
specify where GHC should be installed.

- - - - -
ed57b03a by Travis Whitaker at 2020-05-29T02:14:20-04:00
Build a threaded stage 1 if the bootstrapping GHC supports it.

- - - - -
1532b5cf by Peter Trommler at 2020-05-29T02:14:21-04:00
PPC NCG: No per-symbol .section ".toc" directives

All position independent symbols are collected during code generation
and emitted in one go. Prepending each symbol with a .section ".toc"
directive is redundant. This patch drops the per-symbol directives
leading to smaller assembler files.

Fixes #18250

- - - - -


30 changed files:

- compiler/GHC/Builtin/Names.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/ByteCode/Linker.hs
- compiler/GHC/CmmToAsm/PIC.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Types/Id.hs
- compiler/ghc.mk
- configure.ac
- docs/users_guide/using-concurrent.rst
- ghc/ghc.mk
- hadrian/README.md
- hadrian/cfg/system.config.in
- hadrian/src/CommandLine.hs
- hadrian/src/Expression.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Settings/Packages.hs
- libraries/base/Data/Monoid.hs
- libraries/base/GHC/Base.hs
- libraries/base/GHC/List.hs
- libraries/base/changelog.md
- + libraries/base/tests/perf/Makefile


The diff was not included because it is too large.


View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/32d09881327fbf23433922902bcac845090aa3a4...1532b5cf64b99ffdef2730878a08a252ca12a76d

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