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| author | sheaf <sam.derbyshire@gmail.com> | 2021-07-30 13:50:25 +0200 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2021-08-04 16:38:40 -0400 |
| commit | 7a9d8803cfde3c42da4b27a7b89bdcb2ac870e3f (patch) | |
| tree | 0d2e0dd78e719d93e276fff0a668e8315639ff45 /testsuite | |
| parent | 477bc2dd6d506ece1c5c030f79f3934ff1922a5f (diff) | |
| download | haskell-7a9d8803cfde3c42da4b27a7b89bdcb2ac870e3f.tar.gz | |
Use Reductions to keep track of rewritings
We define Reduction = Reduction Coercion !Type.
A reduction of the form 'Reduction co new_ty' witnesses an
equality ty ~co~> new_ty.
That is, the rewriting happens left-to-right: the right-hand-side
type of the coercion is the rewritten type, and the left-hand-side
type the original type.
Sticking to this convention makes the codebase more consistent,
helping to avoid certain applications of SymCo.
This replaces the parts of the codebase which represented reductions as
pairs, (Coercion,Type) or (Type,Coercion).
Reduction being strict in the Type argument improves performance
in some programs that rewrite many type families (such as T9872).
Fixes #20161
-------------------------
Metric Decrease:
T5321Fun
T9872a
T9872b
T9872c
T9872d
-------------------------
Diffstat (limited to 'testsuite')
| -rw-r--r-- | testsuite/tests/count-deps/CountDepsAst.stdout | 3 | ||||
| -rw-r--r-- | testsuite/tests/count-deps/CountDepsParser.stdout | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/testsuite/tests/count-deps/CountDepsAst.stdout b/testsuite/tests/count-deps/CountDepsAst.stdout index 184f20d7d0..bde8fc08da 100644 --- a/testsuite/tests/count-deps/CountDepsAst.stdout +++ b/testsuite/tests/count-deps/CountDepsAst.stdout @@ -1,4 +1,4 @@ -Found 274 Language.Haskell.Syntax module dependencies +Found 275 Language.Haskell.Syntax module dependencies GHC.Builtin.Names GHC.Builtin.PrimOps GHC.Builtin.Types @@ -42,6 +42,7 @@ GHC.Core.Opt.OccurAnal GHC.Core.PatSyn GHC.Core.Ppr GHC.Core.Predicate +GHC.Core.Reduction GHC.Core.Rules GHC.Core.Seq GHC.Core.SimpleOpt diff --git a/testsuite/tests/count-deps/CountDepsParser.stdout b/testsuite/tests/count-deps/CountDepsParser.stdout index a2ef4064f5..48c1791fed 100644 --- a/testsuite/tests/count-deps/CountDepsParser.stdout +++ b/testsuite/tests/count-deps/CountDepsParser.stdout @@ -1,4 +1,4 @@ -Found 280 GHC.Parser module dependencies +Found 281 GHC.Parser module dependencies GHC.Builtin.Names GHC.Builtin.PrimOps GHC.Builtin.Types @@ -42,6 +42,7 @@ GHC.Core.Opt.OccurAnal GHC.Core.PatSyn GHC.Core.Ppr GHC.Core.Predicate +GHC.Core.Reduction GHC.Core.Rules GHC.Core.Seq GHC.Core.SimpleOpt |