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author | Ben Gamari <bgamari.foss@gmail.com> | 2017-11-02 17:28:40 -0400 |
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committer | Ben Gamari <ben@smart-cactus.org> | 2017-11-02 20:15:47 -0400 |
commit | 15f788f5e5096641245a4f060600a6db9cbc2c4e (patch) | |
tree | 99fa80ab340ffc5860eb5abef778c54d68da3e22 | |
parent | 43537568579a63cb6b8d70b4815d76c46bb9a692 (diff) | |
download | haskell-15f788f5e5096641245a4f060600a6db9cbc2c4e.tar.gz |
llvmGen: Pass vector arguments in vector registers by default
Earlier this year Edward Kmett requested [1] that we enable passing of
vector values in vector registers by default. The GHC calling convention
changes have been in LLVM for a number of years now so let's just flip
the switch.
[1] https://mail.haskell.org/pipermail/ghc-devs/2017-March/013905.html
Reviewers: austin
Subscribers: rwbarton, thomie
Differential Revision: https://phabricator.haskell.org/D4142
-rw-r--r-- | compiler/main/DynFlags.hs | 5 | ||||
-rw-r--r-- | docs/users_guide/using-optimisation.rst | 12 |
2 files changed, 15 insertions, 2 deletions
diff --git a/compiler/main/DynFlags.hs b/compiler/main/DynFlags.hs index a421284779..825497e8ba 100644 --- a/compiler/main/DynFlags.hs +++ b/compiler/main/DynFlags.hs @@ -3757,7 +3757,7 @@ fFlagsDeps = [ flagSpec "kill-one-shot" Opt_KillOneShot, flagSpec "late-dmd-anal" Opt_LateDmdAnal, flagSpec "liberate-case" Opt_LiberateCase, - flagHiddenSpec "llvm-pass-vectors-in-regs" Opt_LlvmPassVectorsInRegisters, + flagSpec "llvm-pass-vectors-in-regs" Opt_LlvmPassVectorsInRegisters, flagHiddenSpec "llvm-tbaa" Opt_LlvmTBAA, flagHiddenSpec "llvm-fill-undef-with-garbage" Opt_LlvmFillUndefWithGarbage, flagSpec "loopification" Opt_Loopification, @@ -4051,7 +4051,8 @@ defaultFlags settings Opt_RPath, Opt_SharedImplib, Opt_SimplPreInlining, - Opt_VersionMacros + Opt_VersionMacros, + Opt_LlvmPassVectorsInRegisters ] ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns] diff --git a/docs/users_guide/using-optimisation.rst b/docs/users_guide/using-optimisation.rst index 4714de7788..fc958e011c 100644 --- a/docs/users_guide/using-optimisation.rst +++ b/docs/users_guide/using-optimisation.rst @@ -493,6 +493,18 @@ by saying ``-fno-wombat``. self-recursive saturated tail calls into local jumps rather than function calls. +.. ghc-flag:: -fllvm-pass-vectors-in-regs + :shortdesc: Pass vector value in vector registers for function calls + :type: dynamic + :reverse: -fno-llvm-pass-vectors-in-regs + :category: + + :default: on + + Instructs GHC to use the platform's native vector registers to pass vector + arguments during function calls. As with all vector support, this requires + :ghc-flag:`-fllvm`. + .. ghc-flag:: -fmax-inline-alloc-size=⟨n⟩ :shortdesc: *default: 128.* Set the maximum size of inline array allocations to ⟨n⟩ bytes (default: 128). |