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| author | Ben Gamari <ben@smart-cactus.org> | 2021-11-15 23:22:06 -0500 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2021-11-16 08:55:07 -0500 |
| commit | fc4d8f1e72cf6aaa7d1bacafa201e3553a63d93a (patch) | |
| tree | 672569f812aae2ccf20c5251fd20524139dcdce7 /compiler/GHC/HsToCore.hs | |
| parent | cc635da167fdec2dead0603b0026cb841f0aa645 (diff) | |
| download | haskell-wip/T20541.tar.gz | |
Increase type sharingwip/T20541
Fixes #20541 by making mkTyConApp do more sharing of types.
In particular, replace
* BoxedRep Lifted ==> LiftedRep
* BoxedRep Unlifted ==> UnliftedRep
* TupleRep '[] ==> ZeroBitRep
* TYPE ZeroBitRep ==> ZeroBitType
In each case, the thing on the right is a type synonym
for the thing on the left, declared in ghc-prim:GHC.Types.
See Note [Using synonyms to compress types] in GHC.Core.Type.
The synonyms for ZeroBitRep and ZeroBitType are new, but absolutely
in the same spirit as the other ones. (These synonyms are mainly
for internal use, though the programmer can use them too.)
I also renamed GHC.Core.Ty.Rep.isVoidTy to isZeroBitTy, to be
compatible with the "zero-bit" nomenclature above. See discussion
on !6806.
There is a tricky wrinkle: see GHC.Core.Types
Note [Care using synonyms to compress types]
Compiler allocation decreases by up to 0.8%.
Diffstat (limited to 'compiler/GHC/HsToCore.hs')
| -rw-r--r-- | compiler/GHC/HsToCore.hs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/GHC/HsToCore.hs b/compiler/GHC/HsToCore.hs index bc87d42a75..d55bdf7115 100644 --- a/compiler/GHC/HsToCore.hs +++ b/compiler/GHC/HsToCore.hs @@ -740,7 +740,7 @@ mkUnsafeCoercePrimPair _old_id old_expr (scrut1, scrut1_ty, rr_cv_ty) = unsafe_equality runtimeRepTy runtimeRep1Ty runtimeRep2Ty - (scrut2, scrut2_ty, ab_cv_ty) = unsafe_equality (tYPE runtimeRep2Ty) + (scrut2, scrut2_ty, ab_cv_ty) = unsafe_equality (mkTYPEapp runtimeRep2Ty) (openAlphaTy `mkCastTy` alpha_co) openBetaTy |