diff options
Diffstat (limited to 'compiler/GHC/Core/Opt/Simplify.hs')
| -rw-r--r-- | compiler/GHC/Core/Opt/Simplify.hs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/GHC/Core/Opt/Simplify.hs b/compiler/GHC/Core/Opt/Simplify.hs index 4f5ece8fca..575512b7c8 100644 --- a/compiler/GHC/Core/Opt/Simplify.hs +++ b/compiler/GHC/Core/Opt/Simplify.hs @@ -1393,6 +1393,7 @@ simplTick env tickish expr cont getDoneId other = pprPanic "getDoneId" (ppr other) -- Note [case-of-scc-of-case] +-- ~~~~~~~~~~~~~~~~~~~~~~~~~~ -- It's pretty important to be able to transform case-of-case when -- there's an SCC in the way. For example, the following comes up -- in nofib/real/compress/Encode.hs: @@ -1992,6 +1993,7 @@ simplIdF env var cont cont' = trimJoinCont var mb_join cont in simplExprF env' e cont' -- Note [zapSubstEnv] + -- ~~~~~~~~~~~~~~~~~~ -- The template is already simplified, so don't re-substitute. -- This is VITAL. Consider -- let x = e in |