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-- | The fusion helper for @enumFromThenTo \@Int@ had multiple
-- occurences of @c@, which made the simplifier refuse to inline it.
-- The new implementation for @efdtInt{Up,Dn}FB@ only have a single
-- occurence of @c@ which the simplifier inlines unconditionally.
module Main (main) where
import Control.Monad (when, forM_)
import GHC.ST
nop :: Monad m => a -> m ()
nop _ = return ()
{-# NOINLINE nop #-}
-- This is the baseline, using @enumFromTo@ which already had only a
-- single occurence of @c@.
f :: Int -> ST s ()
f n =
do
forM_ [2..n] $ \p -> do
let isPrime = p == (p - 1)
when isPrime $
forM_ [p + p, p + p + p .. n] $ \k -> do
nop k
{-# NOINLINE f #-}
g :: Int -> ST s ()
g n =
do
forM_ [2,3..n] $ \p -> do
-- This do block should be too big to get inlined multiple times.
-- Pad with @nop@s as necessary if this doesn't reproduce anymore.
let isPrime = p == (p - 1)
when isPrime $
forM_ [p + p, p + p + p .. n] $ \k -> do
nop k
{-# NOINLINE g #-}
main :: IO ()
main = do
-- runST (f 40000000) `seq` return ()
runST (g 40000000) `seq` return ()
|
