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* Experiment with one-byte info tableswip/rwbarton-tiny-tablesReid Barton2016-02-291-0/+5
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* Overhaul the Overhauled Pattern Match CheckerGeorge Karachalias2016-02-041-4/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Overhaul the Overhauled Pattern Match Checker * Changed the representation of Value Set Abstractions. Instead of using a prefix tree, we now use a list of Value Vector Abstractions. The set of constraints Delta for every Value Vector Abstraction is the oracle state so that we solve everything only once. * Instead of doing everything lazily, we prune at once (and in general everything is much stricter). Hence, an example written with pattern guards is checked in almost the same time as the equivalent with pattern matching. * Do not store the covered and the divergent sets at all. Since what we only need is a yes/no (does this clause cover anything? Does it force any thunk?) We just keep a boolean for each. * Removed flags `-Wtoo-many-guards` and `-ffull-guard-reasoning`. Replaced with `fmax-pmcheck-iterations=n`. Still debatable what should the default `n` be. * When a guard is for sure not going to contribute anything, we treat it as such: The oracle is not called and cases `CGuard`, `UGuard` and `DGuard` from the paper are not happening at all (the generation of a fresh variable, the unfolding of the pattern list etc.). his combined with the above seems to be enough to drop the memory increase for test T783 down to 18.7%. * Do not export function `dsPmWarn` (it is now called directly from within `checkSingle` and `checkMatches`). * Make `PmExprVar` hold a `Name` instead of an `Id`. The term oracle does not handle type information so using `Id` was a waste of time/space. * Added testcases T11195, T11303b (data families) and T11374 The patch addresses at least the following: Trac #11195, #11276, #11303, #11374, #11162 Test Plan: validate Reviewers: goldfire, bgamari, hvr, austin Subscribers: simonpj, thomie Differential Revision: https://phabricator.haskell.org/D1795
* Restore original alignment for info tablesSimon Brenner2016-01-273-4/+24
| | | | | | | | | | | | | | | | | | | | This was broken in 4a32bf925b8aba7885d9c745769fe84a10979a53, meaning that info tables and subsequent code are no longer guaranteed to have the recommended alignment. Split up the section header and section alignment printers, and print an appropriate alignment directive before each info table. Fixes Trac #11486 Reviewers: austin, bgamari, rwbarton Reviewed By: bgamari, rwbarton Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1847 GHC Trac Issues: #11486
* Replace calls to `ptext . sLit` with `text`Jan Stolarek2016-01-189-307/+305
| | | | | | | | | | | | | | | | | | | | Summary: In the past the canonical way for constructing an SDoc string literal was the composition `ptext . sLit`. But for some time now we have function `text` that does the same. Plus it has some rules that optimize its runtime behaviour. This patch takes all uses of `ptext . sLit` in the compiler and replaces them with calls to `text`. The main benefits of this patch are clener (shorter) code and less dependencies between module, because many modules now do not need to import `FastString`. I don't expect any performance benefits - we mostly use SDocs to report errors and it seems there is little to be gained here. Test Plan: ./validate Reviewers: bgamari, austin, goldfire, hvr, alanz Subscribers: goldfire, thomie, mpickering Differential Revision: https://phabricator.haskell.org/D1784
* Remove some redundant definitions/constraintsHerbert Valerio Riedel2015-12-313-3/+0
| | | | | | Starting with GHC 7.10 and base-4.8, `Monad` implies `Applicative`, which allows to simplify some definitions to exploit the superclass relationship. This a first refactoring to that end.
* Drop pre-AMP compatibility CPP conditionalsHerbert Valerio Riedel2015-12-313-10/+0
| | | | | | | | | | | | Since GHC 8.1/8.2 only needs to be bootstrap-able by GHC 7.10 and GHC 8.0 (and GHC 8.2), we can now finally drop all that pre-AMP compatibility CPP-mess for good! Reviewers: austin, goldfire, bgamari Subscribers: goldfire, thomie, erikd Differential Revision: https://phabricator.haskell.org/D1724
* Adding flags: -ffull-guard-reasoning and too-many-guardsGeorge Karachalias2015-12-271-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduction of two new flags, for more precise control over the new pattern match checker's behaviour when reasoning about guards. This is supposed to address #11195 (and maybe more performance bugs related to the NP-Hardness of coverage checking). Expected behaviour: * When `-ffull-guard-reasoning` is on, run the new pattern match checker in its full power * When `-ffull-guard-reasoning` is off (the default), for every match, check a metric to see whether pattern match checking for it has high probability of being non performant (at the the moment we check whether the number of guards is over 20 but I would like to use a more precise measure in the future). If the probability is high: - Oversimplify the guards (less expressive but more performant) and run the checker, and - Issue a warning about the simplification that happened. A new flag `-Wtoo-many-guards/-Wno-too-many-guards` suppresses the warning about the simplification (useful when combined with -Werror). Test Plan: validate Reviewers: goldfire, austin, hvr, bgamari Reviewed By: bgamari Subscribers: mpickering, thomie Differential Revision: https://phabricator.haskell.org/D1676 GHC Trac Issues: #11195
* Add sparc64 a known architecture (Ticket #11211)John Paul Adrian Glaubitz2015-12-195-0/+12
| | | | | | | | | | | | Explicitly pass "--no-relax" on ArchSPARC64 (as ArchSPARC does) where gcc's default specs set "-mrelax" which conflicts with "-Wl,-r". Known architecture will also help extending sparc NCG support 64-bit ABI. Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Signed-off-by: Sergei Trofimovich <siarheit@google.com>
* DynFlags: remove Opt_StaticThomas Miedema2015-12-151-7/+7
| | | | | | | | | | | | | | | | | | | | | | | | There are currently 2 different ways to test for a static or dynamic build: * Test if WayDyn is in ways * Test if Opt_Static is set The problem is that these can easily go out of sync, especially when using the GHC API. This commit replaces all queries of Opt_Static with an equivalent query of WayDyn. This would have prevented bug #8294 and fixes #11154. Reviewers: hvr, austin, bgamari Reviewed By: austin, bgamari Differential Revision: https://phabricator.haskell.org/D1607 GHC Trac Issues: #10636
* Dwarf: Use .short instead of .hword on DarwinBen Gamari2015-12-121-1/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | Apparently gnu as uses `.short` as a synonym for `.word`. To emit a 16-bit value one would use `.hword`. However, Darwin doesn't support `.hword`, instead taking `.short` to mean a 16-bit value. The insanity is nearly unbearable! OS X reference: https://developer.apple.com/library/mac/documentation/DeveloperTools/Ref erence/Assembler/040-Assembler_Directives/asm_directives.html#//apple_re f/doc/uid/TP30000823-TPXREF101 gnu as reference: https://sourceware.org/binutils/docs/as/hword.html#hword Test Plan: Validate Reviewers: austin Reviewed By: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1602 GHC Trac Issues: #11202
* Add kind equalities to GHC.Richard Eisenberg2015-12-1115-205/+201
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This implements the ideas originally put forward in "System FC with Explicit Kind Equality" (ICFP'13). There are several noteworthy changes with this patch: * We now have casts in types. These change the kind of a type. See new constructor `CastTy`. * All types and all constructors can be promoted. This includes GADT constructors. GADT pattern matches take place in type family equations. In Core, types can now be applied to coercions via the `CoercionTy` constructor. * Coercions can now be heterogeneous, relating types of different kinds. A coercion proving `t1 :: k1 ~ t2 :: k2` proves both that `t1` and `t2` are the same and also that `k1` and `k2` are the same. * The `Coercion` type has been significantly enhanced. The documentation in `docs/core-spec/core-spec.pdf` reflects the new reality. * The type of `*` is now `*`. No more `BOX`. * Users can write explicit kind variables in their code, anywhere they can write type variables. For backward compatibility, automatic inference of kind-variable binding is still permitted. * The new extension `TypeInType` turns on the new user-facing features. * Type families and synonyms are now promoted to kinds. This causes trouble with parsing `*`, leading to the somewhat awkward new `HsAppsTy` constructor for `HsType`. This is dispatched with in the renamer, where the kind `*` can be told apart from a type-level multiplication operator. Without `-XTypeInType` the old behavior persists. With `-XTypeInType`, you need to import `Data.Kind` to get `*`, also known as `Type`. * The kind-checking algorithms in TcHsType have been significantly rewritten to allow for enhanced kinds. * The new features are still quite experimental and may be in flux. * TODO: Several open tickets: #11195, #11196, #11197, #11198, #11203. * TODO: Update user manual. Tickets addressed: #9017, #9173, #7961, #10524, #8566, #11142. Updates Haddock submodule.
* Kill redundant patternsBen Gamari2015-12-032-5/+0
| | | | | George's new exhaustiveness checker now realizes these are impossible. Yay!
* Output source notes in extended DWARF DIEsBen Gamari2015-11-233-29/+119
| | | | | | | | In order to accomplish this we need to ensure that emit DIEs for all DebugBlocks, even those that have been optimized out, lest we end up with undefined symbols of parents at link time. Differential Revision: https://phabricator.haskell.org/D1279
* Dwarf: Ensure tick parentage is preservedBen Gamari2015-11-231-8/+42
| | | | Differential Revision: https://phabricator.haskell.org/D1387
* Support multiple debug output levelsBen Gamari2015-11-233-9/+10
| | | | | | | | | We now only strip block information from DebugBlocks when compiling with `-g1`, intended to be used when only minimal debug information is desired. `-g2` is assumed when `-g` is passed without any integer argument. Differential Revision: https://phabricator.haskell.org/D1281
* Fix inconsistent pretty-printing of type familiesMichał Sośnicki2015-11-182-3/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | After the changes, the three functions used to print type families were identical, so they are refactored into one. Original RHSs of data instance declarations are recreated and printed in user error messages. RHSs containing representation TyCons are printed in the Coercion Axioms section in a typechecker dump. Add vbar to the list of SDocs exported by Outputable. Replace all text "|" docs with it. Fixes #10839 Reviewers: goldfire, jstolarek, austin, bgamari Reviewed By: jstolarek Subscribers: jstolarek, thomie Differential Revision: https://phabricator.haskell.org/D1441 GHC Trac Issues: #10839
* Implement function-sections for Haskell code, #8405Simon Brenner2015-11-1211-208/+233
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds a flag -split-sections that does similar things to -split-objs, but using sections in single object files instead of relying on the Satanic Splitter and other abominations. This is very similar to the GCC flags -ffunction-sections and -fdata-sections. The --gc-sections linker flag, which allows unused sections to actually be removed, is added to all link commands (if the linker supports it) so that space savings from having base compiled with sections can be realized. Supported both in LLVM and the native code-gen, in theory for all architectures, but really tested on x86 only. In the GHC build, a new SplitSections variable enables -split-sections for relevant parts of the build. Test Plan: validate with both settings of SplitSections Reviewers: dterei, Phyx, austin, simonmar, thomie, bgamari Reviewed By: simonmar, thomie, bgamari Subscribers: hsyl20, erikd, kgardas, thomie Differential Revision: https://phabricator.haskell.org/D1242 GHC Trac Issues: #8405
* nativeGen.PPC: Fix shift arith. right > 31 bitsPeter Trommler2015-11-111-3/+8
| | | | | | | | | | | | | | | | | | | | | Arithmetic right shifts of more than 31 bits set all bits to the sign bit on PowerPC. iThe assembler does not allow shift amounts larger than 32 so do an arithemetic right shift of 31 bit instead. Fixes #10870 Test Plan: validate (especially on powerpc) Reviewers: austin, erikd, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1459 GHC Trac Issues: #10870
* Dwarf.Constants: Introduce Haddock sectionsBen Gamari2015-11-011-8/+8
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* cmm: Expose machine's stack and return address registerBen Gamari2015-11-011-1/+2
| | | | | | | | | | We will need to use these to setup proper unwinding information for the stg_stop_thread closure. This pokes a hole in the STG abstraction, exposing the machine's stack pointer register so that we can accomplish this. We also expose a dummy return address register, which corresponds to the register used to hold the DWARF return address. Differential Revision: https://phabricator.haskell.org/D1225
* Dwarf.Types: Fix comment styleBen Gamari2015-11-011-5/+5
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* Dwarf: Preserve stack pointer registerBen Gamari2015-11-011-1/+11
| | | | | | | | | | | | | | | | | Here we add a `same_value $sp` instruction to our default unwinding rules to ensure that the implicit `$sp = CFA` rule (which `libdw` appears to exhibit on x86_64) doesn't overwrite it (necessary since we don't use $sp to track our call stack). See Phab Diff D1189 for details on how we arrived at this resolution. Reviewers: scpmw, austin, simonmar Reviewed By: austin, simonmar Subscribers: thomie, simonmar Differential Revision: https://phabricator.haskell.org/D1224
* Add subWordC# on x86ishNikita Karetnikov2015-10-313-5/+12
| | | | | | | | | | | | | | | This adds a subWordC# primop which implements subtraction with overflow reporting. Reviewers: tibbe, goldfire, rwbarton, bgamari, austin, hvr Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1334 GHC Trac Issues: #10962
* x86 codegen: don't generate location commentsSergei Trofimovich2015-10-291-3/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | The following source snippet 'module A where x */* y = 42' when being compiled with '-g' option emits syntactically invalid comment for GNU as: .text .align 8 .loc 1 3 1 /* */* */ Fixed by not emitting comments at all. We already suppress all asm comments in 'X86/Ppr.hs'. Signed-off-by: Sergei Trofimovich <siarheit@google.com> Test Plan: added test and check it works Reviewers: scpmw, simonmar, austin, bgamari Reviewed By: simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1386 GHC Trac Issues: #10667
* Make Monad/Applicative instances MRP-friendlyHerbert Valerio Riedel2015-10-173-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | This patch refactors pure/(*>) and return/(>>) in MRP-friendly way, i.e. such that the explicit definitions for `return` and `(>>)` match the MRP-style default-implementation, i.e. return = pure and (>>) = (*>) This way, e.g. all `return = pure` definitions can easily be grepped and removed in GHC 8.1; Test Plan: Harbormaster Reviewers: goldfire, alanz, bgamari, quchen, austin Reviewed By: quchen, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1312
* Rename package key to unit ID, and installed package ID to component ID.Edward Z. Yang2015-10-142-7/+7
| | | | | | Comes with Haddock submodule update. Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
* PPC: Fix right shift by 32 bits #10870Erik de Castro Lopo2015-10-121-6/+15
| | | | | | | | | | | | | | Summary: Test included. Test Plan: Run test T10870.hs on X86/X86_64/Arm/Arm64 etc Reviewers: bgamari, nomeata, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1322 GHC Trac Issues: #10870
* compiler/nativeGen/PPC/Ppr.hs: WhitespaceErik de Castro Lopo2015-10-121-7/+7
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* AsmCodeGen: Ensure LLVM .line directives are sortedBen Gamari2015-10-071-2/+6
| | | | | | | | Apparently some Clang 3.6 expects these to be sorted. Patch due to Peter Wortmann. Fixes #10687.
* nativeGen PPC: fix > 16 bit offsets in stack handlingPeter Trommler2015-10-023-13/+73
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement access to spill slots at offsets larger than 16 bits. Also allocation and deallocation of spill slots was restricted to 16 bit offsets. Now 32 bit offsets are supported on all PowerPC platforms. The implementation of 32 bit offsets requires more than one instruction but the native code generator wants one instruction. So we implement pseudo-instructions that are pretty printed into multiple assembly instructions. With pseudo-instructions for spill slot allocation and deallocation we can also implement handling of the back chain pointer according to the ELF ABIs. Test Plan: validate (especially on powerpc (32 bit)) Reviewers: bgamari, austin, erikd Reviewed By: erikd Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1296 GHC Trac Issues: #7830
* Dwarf: Ensure block length is encoded correctlyBen Gamari2015-09-251-1/+1
| | | | | | | | | | | | | | | | | | | | This is supposed to be encoded with ULEB128 which the previous implementation would only guarranty with short lengths. This likely holds in nearly all cases, but I'd really rather not take changes. I fix this using the `.uleb128` directive. I'm not certain that this is portable across assemblers but it makes this quite straightforward and at the moment I value correctness over portability. Test Plan: Compare implementation to DWARF spec Reviewers: scpmw, austin Reviewed By: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1220
* Dwarf: Rename binding to avoid shadowing pprBen Gamari2015-09-251-8/+8
| | | | | | | | | | Reviewers: austin Reviewed By: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1221
* Annotate CmmBranch with an optional likely targetSimon Marlow2015-09-234-11/+14
| | | | | | | | | | | | | | | | | Summary: This allows the code generator to give hints to later code generation steps about which branch is most likely to be taken. Right now it is only taken into account in one place: a special case in CmmContFlowOpt that swapped branches over to maximise the chance of fallthrough, which is now disabled when there is a likelihood setting. Test Plan: validate Reviewers: austin, simonpj, bgamari, ezyang, tibbe Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1273
* CodeGen: fix typo in error messageThomas Miedema2015-09-121-1/+1
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* Dwarf: Produce .dwarf_aranges sectionBen Gamari2015-08-293-21/+77
| | | | | | | | | | Test Plan: Check with `readelf --debug-dump=ranges` Reviewers: scpmw, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1174
* Dwarf: Produce {low,high}_pc attributes for compilation unitsBen Gamari2015-08-292-2/+13
| | | | | | | | | | | | | Some libraries (e.g. elfutils) need these otherwise they ignore our DWARF annotations. Test Plan: Test with elfutils' `readelf --debug-dump=cu_index` Reviewers: scpmw, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1173
* Dwarf: Fix DW_AT_use_UTF8 attributeBen Gamari2015-08-292-5/+6
| | | | | | | | | | | | | Previously this was given in the body but not in the abbreviation table. Who knows what sort of havoc this was wrecking. Test Plan: Verify against DWARF4 specification Reviewers: scpmw, austin Subscribers: Tarrasch, thomie Differential Revision: https://phabricator.haskell.org/D1172
* Refactor: delete most of the module FastTypesThomas Miedema2015-08-215-92/+85
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverses some of the work done in #1405, and goes back to the assumption that the bootstrap compiler understands GHC-haskell. In particular: * use MagicHash instead of _ILIT and _CLIT * pattern matching on I# if possible, instead of using iUnbox unnecessarily * use Int#/Char#/Addr# instead of the following type synonyms: - type FastInt = Int# - type FastChar = Char# - type FastPtr a = Addr# * inline the following functions: - iBox = I# - cBox = C# - fastChr = chr# - fastOrd = ord# - eqFastChar = eqChar# - shiftLFastInt = uncheckedIShiftL# - shiftR_FastInt = uncheckedIShiftRL# - shiftRLFastInt = uncheckedIShiftRL# * delete the following unused functions: - minFastInt - maxFastInt - uncheckedIShiftRA# - castFastPtr - panicDocFastInt and pprPanicFastInt * rename panicFastInt back to panic# These functions remain, since they actually do something: * iUnbox * bitAndFastInt * bitOrFastInt Test Plan: validate Reviewers: austin, bgamari Subscribers: rwbarton Differential Revision: https://phabricator.haskell.org/D1141 GHC Trac Issues: #1405
* Delete FastBoolThomas Miedema2015-08-219-27/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverses some of the work done in Trac #1405, and assumes GHC is smart enough to do its own unboxing of booleans now. I would like to do some more performance measurements, but the code changes can be reviewed already. Test Plan: With a perf build: ./inplace/bin/ghc-stage2 nofib/spectral/simple/Main.hs -fforce-recomp +RTS -t --machine-readable before: ``` [("bytes allocated", "1300744864") ,("num_GCs", "302") ,("average_bytes_used", "8811118") ,("max_bytes_used", "24477464") ,("num_byte_usage_samples", "9") ,("peak_megabytes_allocated", "64") ,("init_cpu_seconds", "0.001") ,("init_wall_seconds", "0.001") ,("mutator_cpu_seconds", "2.833") ,("mutator_wall_seconds", "4.283") ,("GC_cpu_seconds", "0.960") ,("GC_wall_seconds", "0.961") ] ``` after: ``` [("bytes allocated", "1301088064") ,("num_GCs", "310") ,("average_bytes_used", "8820253") ,("max_bytes_used", "24539904") ,("num_byte_usage_samples", "9") ,("peak_megabytes_allocated", "64") ,("init_cpu_seconds", "0.001") ,("init_wall_seconds", "0.001") ,("mutator_cpu_seconds", "2.876") ,("mutator_wall_seconds", "4.474") ,("GC_cpu_seconds", "0.965") ,("GC_wall_seconds", "0.979") ] ``` CPU time seems to be up a bit, but I'm not sure. Unfortunately CPU time measurements are rather noisy. Reviewers: austin, bgamari, rwbarton Subscribers: nomeata Differential Revision: https://phabricator.haskell.org/D1143 GHC Trac Issues: #1405
* Fix misspelled function name in a commentBartosz Nitka2015-07-301-1/+1
| | | | | | | | | | | | Test Plan: none Reviewers: austin, simonmar, bgamari Reviewed By: simonmar, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1112
* Fix todo in compiler/nativeGen: Rename Size to Formatmarkus2015-07-0721-935/+944
| | | | | | | | | | | | | | | | | | This commit renames the Size module in the native code generator to Format, as proposed by a todo, as well as adjusting parameter names in other modules that use it. Test Plan: validate Reviewers: austin, simonmar, bgamari Reviewed By: simonmar, bgamari Subscribers: bgamari, simonmar, thomie Projects: #ghc Differential Revision: https://phabricator.haskell.org/D865
* Implement PowerPC 64-bit native code backend for LinuxPeter Trommler2015-07-0310-238/+840
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extend the PowerPC 32-bit native code generator for "64-bit PowerPC ELF Application Binary Interface Supplement 1.9" by Ian Lance Taylor and "Power Architecture 64-Bit ELF V2 ABI Specification -- OpenPOWER ABI for Linux Supplement" by IBM. The latter ABI is mainly used on POWER7/7+ and POWER8 Linux systems running in little-endian mode. The code generator supports both static and dynamic linking. PowerPC 64-bit code for ELF ABI 1.9 and 2 is mostly position independent anyway, and thus so is all the code emitted by the code generator. In other words, -fPIC does not make a difference. rts/stg/SMP.h support is implemented. Following the spirit of the introductory comment in PPC/CodeGen.hs, the rest of the code is a straightforward extension of the 32-bit implementation. Limitations: * Code is generated only in the medium code model, which is also gcc's default * Local symbols are not accessed directly, which seems to also be the case for 32-bit * LLVM does not work, but this does not work on 32-bit either * Must use the system runtime linker in GHCi, because the GHC linker for "static" object files (rts/Linker.c) for PPC 64-bit is not implemented. The system runtime (dynamic) linker works. * The handling of the system stack (register 1) is not ELF- compliant so stack traces break. Instead of allocating a new stack frame, spill code should use the "official" spill area in the current stack frame and deallocation code should restore the back chain * DWARF support is missing Fixes #9863 Test Plan: validate (on powerpc, too) Reviewers: simonmar, trofi, erikd, austin Reviewed By: trofi Subscribers: bgamari, arnons1, kgardas, thomie Differential Revision: https://phabricator.haskell.org/D629 GHC Trac Issues: #9863
* Encode alignment in MO_Memcpy and friendsBen Gamari2015-06-163-48/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: Alignment needs to be a compile-time constant. Previously the code generators had to jump through hoops to ensure this was the case as the alignment was passed as a CmmExpr in the arguments list. Now we take care of this up front. This fixes #8131. Authored-by: Reid Barton <rwbarton@gmail.com> Dusted-off-by: Ben Gamari <ben@smart-cactus.org> Tests for T8131 Test Plan: Validate Reviewers: rwbarton, austin Reviewed By: rwbarton, austin Subscribers: bgamari, carter, thomie Differential Revision: https://phabricator.haskell.org/D624 GHC Trac Issues: #8131
* Fix DWARF generation for MinGW (#10468)Peter Wortmann2015-06-113-12/+16
| | | | | | | Fortunately this is relatively straightforward - all we need to do is switch to a non-ELF-specific way of specifying object file sections and make sure that section-relative addresses work correctly. This is enough to make "gdb" work on MinGW builds.
* Greatly speed up nativeCodeGen/seqBlocksJoachim Breitner2015-05-161-18/+35
| | | | | | | | | When working on #10397, I noticed that "reorder" in nativeCodeGen/seqBlocks took more than 60% of the time. With this refactoring, it does not even show up in the profile any more. This fixes #10422. Differential Revision: https://phabricator.haskell.org/D893
* Restore unwind information generationPeter Wortmann2015-04-031-2/+2
| | | | | | | | | | | | | | | | While we want to reduce the amount of information generated into debug_info, it really doesn't make sense to remove block information for unwinding. This is a simple oversight introduced in 4ab57024, which severly reduces the usefulness of generated unwind data. Thanks to bitonic for spotting this! Reviewed By: austin Differential Revision: https://phabricator.haskell.org/D792 GHC Trac Issues: #10236
* Refactor the story around switches (#10137)Joachim Breitner2015-03-303-17/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This re-implements the code generation for case expressions at the Stg → Cmm level, both for data type cases as well as for integral literal cases. (Cases on float are still treated as before). The goal is to allow for fancier strategies in implementing them, for a cleaner separation of the strategy from the gritty details of Cmm, and to run this later than the Common Block Optimization, allowing for one way to attack #10124. The new module CmmSwitch contains a number of notes explaining this changes. For example, it creates larger consecutive jump tables than the previous code, if possible. nofib shows little significant overall improvement of runtime. The rather large wobbling comes from changes in the code block order (see #8082, not much we can do about it). But the decrease in code size alone makes this worthwhile. ``` Program Size Allocs Runtime Elapsed TotalMem Min -1.8% 0.0% -6.1% -6.1% -2.9% Max -0.7% +0.0% +5.6% +5.7% +7.8% Geometric Mean -1.4% -0.0% -0.3% -0.3% +0.0% ``` Compilation time increases slightly: ``` -1 s.d. ----- -2.0% +1 s.d. ----- +2.5% Average ----- +0.3% ``` The test case T783 regresses a lot, but it is the only one exhibiting any regression. The cause is the changed order of branches in an if-then-else tree, which makes the hoople data flow analysis traverse the blocks in a suboptimal order. Reverting that gets rid of this regression, but has a consistent, if only very small (+0.2%), negative effect on runtime. So I conclude that this test is an extreme outlier and no reason to change the code. Differential Revision: https://phabricator.haskell.org/D720
* Replace .lhs with .hs in compiler commentsYuri de Wit2015-02-093-4/+4
| | | | | | | | | | | | | | Summary: It looks like during .lhs -> .hs switch the comments were not updated. So doing exactly that. Reviewers: austin, jstolarek, hvr, goldfire Reviewed By: austin, jstolarek Subscribers: thomie, goldfire Differential Revision: https://phabricator.haskell.org/D621 GHC Trac Issues: #9986
* Dwarf generation fixed pt 2Peter Wortmann2015-01-133-15/+28
| | | | | | | | | - Don't bracket HsTick expression uneccessarily - Generate debug information in UTF8 - Reduce amount of information generated - we do not currently need block information, for example. Special thanks to slyfox for the reports!
* Remove redundant constraints in the compiler itself, found by ↵Simon Peyton Jones2015-01-063-10/+7
| | | | -fwarn-redundant-constraints
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