[Git][ghc/ghc][master] Fix the order of spill/reload instructions

Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC Commits: aada5db9 by ARATA Mizuki at 2025-11-11T11:52:07-05:00 Fix the order of spill/reload instructions The AArch64 NCG could emit multiple instructions for a single spill/reload, but their order was not consistent between the definition and a use. Fixes #26537 Co-authored-by: sheaf - - - - - 4 changed files: - compiler/GHC/CmmToAsm/Reg/Liveness.hs - + testsuite/tests/codeGen/should_run/T26537.hs - + testsuite/tests/codeGen/should_run/T26537.stdout - testsuite/tests/codeGen/should_run/all.T Changes: ===================================== compiler/GHC/CmmToAsm/Reg/Liveness.hs ===================================== @@ -48,6 +48,7 @@ import GHC.Cmm import GHC.CmmToAsm.Reg.Target import GHC.Data.Graph.Directed +import GHC.Data.OrdList import GHC.Utils.Monad import GHC.Utils.Outputable import GHC.Utils.Panic @@ -562,30 +563,26 @@ stripLiveBlock config (BasicBlock i lis) = BasicBlock i instrs' where (instrs', _) - = runState (spillNat [] lis) 0 + = runState (spillNat nilOL lis) 0 - -- spillNat :: [instr] -> [LiveInstr instr] -> State Int [instr] - spillNat :: Instruction instr => [instr] -> [LiveInstr instr] -> State Int [instr] + spillNat :: Instruction instr => OrdList instr -> [LiveInstr instr] -> State Int [instr] spillNat acc [] - = return (reverse acc) + = return (fromOL acc) - -- The SPILL/RELOAD cases do not appear to be exercised by our codegens - -- spillNat acc (LiveInstr (SPILL reg slot) _ : instrs) = do delta <- get - spillNat (mkSpillInstr config reg delta slot ++ acc) instrs + spillNat (acc `appOL` toOL (mkSpillInstr config reg delta slot)) instrs spillNat acc (LiveInstr (RELOAD slot reg) _ : instrs) = do delta <- get - spillNat (mkLoadInstr config reg delta slot ++ acc) instrs + spillNat (acc `appOL` toOL (mkLoadInstr config reg delta slot)) instrs spillNat acc (LiveInstr (Instr instr) _ : instrs) | Just i <- takeDeltaInstr instr = do put i spillNat acc instrs - - spillNat acc (LiveInstr (Instr instr) _ : instrs) - = spillNat (instr : acc) instrs + | otherwise + = spillNat (acc `snocOL` instr) instrs -- | Erase Delta instructions. ===================================== testsuite/tests/codeGen/should_run/T26537.hs ===================================== @@ -0,0 +1,72 @@ +{-# LANGUAGE MagicHash #-} +{-# LANGUAGE UnboxedTuples #-} +import GHC.Exts + +type D8 = (# Double#, Double#, Double#, Double#, Double#, Double#, Double#, Double# #) +type D64 = (# D8, D8, D8, D8, D8, D8, D8, D8 #) +type D512 = (# D64, D64, D64, D64, D64, D64, D64, D64 #) + +unD# :: Double -> Double# +unD# (D# x) = x + +mkD8 :: Double -> D8 +mkD8 x = (# unD# x, unD# (x + 1), unD# (x + 2), unD# (x + 3), unD# (x + 4), unD# (x + 5), unD# (x + 6), unD# (x + 7) #) +{-# NOINLINE mkD8 #-} + +mkD64 :: Double -> D64 +mkD64 x = (# mkD8 x, mkD8 (x + 8), mkD8 (x + 16), mkD8 (x + 24), mkD8 (x + 32), mkD8 (x + 40), mkD8 (x + 48), mkD8 (x + 56) #) +{-# NOINLINE mkD64 #-} + +mkD512 :: Double -> D512 +mkD512 x = (# mkD64 x, mkD64 (x + 64), mkD64 (x + 128), mkD64 (x + 192), mkD64 (x + 256), mkD64 (x + 320), mkD64 (x + 384), mkD64 (x + 448) #) +{-# NOINLINE mkD512 #-} + +addD8 :: D8 -> D8 -> D8 +addD8 (# x0, x1, x2, x3, x4, x5, x6, x7 #) (# y0, y1, y2, y3, y4, y5, y6, y7 #) = (# x0 +## y0, x1 +## y1, x2 +## y2, x3 +## y3, x4 +## y4, x5 +## y5, x6 +## y6, x7 +## y7 #) +{-# NOINLINE addD8 #-} + +addD64 :: D64 -> D64 -> D64 +addD64 (# x0, x1, x2, x3, x4, x5, x6, x7 #) (# y0, y1, y2, y3, y4, y5, y6, y7 #) = (# addD8 x0 y0, addD8 x1 y1, addD8 x2 y2, addD8 x3 y3, addD8 x4 y4, addD8 x5 y5, addD8 x6 y6, addD8 x7 y7 #) +{-# NOINLINE addD64 #-} + +addD512 :: D512 -> D512 -> D512 +addD512 (# x0, x1, x2, x3, x4, x5, x6, x7 #) (# y0, y1, y2, y3, y4, y5, y6, y7 #) = (# addD64 x0 y0, addD64 x1 y1, addD64 x2 y2, addD64 x3 y3, addD64 x4 y4, addD64 x5 y5, addD64 x6 y6, addD64 x7 y7 #) +{-# NOINLINE addD512 #-} + +toListD8 :: D8 -> [Double] +toListD8 (# x0, x1, x2, x3, x4, x5, x6, x7 #) = [D# x0, D# x1, D# x2, D# x3, D# x4, D# x5, D# x6, D# x7] +{-# NOINLINE toListD8 #-} + +toListD64 :: D64 -> [Double] +toListD64 (# x0, x1, x2, x3, x4, x5, x6, x7 #) = concat [toListD8 x0, toListD8 x1, toListD8 x2, toListD8 x3, toListD8 x4, toListD8 x5, toListD8 x6, toListD8 x7] +{-# NOINLINE toListD64 #-} + +toListD512 :: D512 -> [Double] +toListD512 (# x0, x1, x2, x3, x4, x5, x6, x7 #) = concat [toListD64 x0, toListD64 x1, toListD64 x2, toListD64 x3, toListD64 x4, toListD64 x5, toListD64 x6, toListD64 x7] +{-# NOINLINE toListD512 #-} + +data T = MkT D512 D64 + +mkT :: Double -> T +mkT x = MkT (mkD512 x) (mkD64 (x + 512)) +{-# NOINLINE mkT #-} + +addT :: T -> T -> T +addT (MkT x0 x1) (MkT y0 y1) = MkT (addD512 x0 y0) (addD64 x1 y1) +{-# NOINLINE addT #-} + +toListT :: T -> [Double] +toListT (MkT x0 x1) = toListD512 x0 ++ toListD64 x1 +{-# NOINLINE toListT #-} + +main :: IO () +main = do + let n = 512 + 64 + let !x = mkT 0 + !y = mkT n + print $ toListT x + print $ toListT y + print $ toListT (addT x y) + print $ toListT x == [0..n-1] + print $ toListT y == [n..2*n-1] + print $ toListT (addT x y) == zipWith (+) [0..n-1] [n..2*n-1] ===================================== testsuite/tests/codeGen/should_run/T26537.stdout ===================================== @@ -0,0 +1,6 @@ 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+True +True +True ===================================== testsuite/tests/codeGen/should_run/all.T ===================================== @@ -256,3 +256,4 @@ test('T24893', normal, compile_and_run, ['-O']) test('CCallConv', [req_c], compile_and_run, ['CCallConv_c.c']) test('T25364', normal, compile_and_run, ['']) test('T26061', normal, compile_and_run, ['']) +test('T26537', js_broken(26558), compile_and_run, ['-O2 -fregs-graph']) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/aada5db93a2f0fd00c0715ad9ca4f666... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/aada5db93a2f0fd00c0715ad9ca4f666... 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