cmmMiniInlineStmts uses (stmt:stmts)
= stmt : cmmMiniInlineStmts uses stmts
+lookForInline u expr (stmt : rest)
+ | Just 1 <- lookupUFM (countUses stmt) u, ok_to_inline
+ = Just (inlineStmt u expr stmt : rest)
+
+ | ok_to_skip
+ = case lookForInline u expr rest of
+ Nothing -> Nothing
+ Just stmts -> Just (stmt:stmts)
+
+ | otherwise
+ = Nothing
--- Try to inline a temporary assignment. We can skip over assignments to
--- other tempoararies, because we know that expressions aren't side-effecting
--- and temporaries are single-assignment.
-lookForInline u expr (stmt@(CmmAssign (CmmLocal (LocalReg u' _)) rhs) : rest)
- | u /= u'
- = case lookupUFM (countUses rhs) u of
- Just 1 -> Just (inlineStmt u expr stmt : rest)
- _other -> case lookForInline u expr rest of
- Nothing -> Nothing
- Just stmts -> Just (stmt:stmts)
-
-lookForInline u expr (CmmNop : rest)
- = lookForInline u expr rest
-
-lookForInline _ _ [] = Nothing
-
-lookForInline u expr (stmt:stmts)
- = case lookupUFM (countUses stmt) u of
- Just 1 | ok_to_inline -> Just (inlineStmt u expr stmt : stmts)
- _other -> Nothing
where
-- we don't inline into CmmCall if the expression refers to global
-- registers. This is a HACK to avoid global registers clashing with
CmmCall{} -> hasNoGlobalRegs expr
_ -> True
+ -- We can skip over assignments to other tempoararies, because we
+ -- know that expressions aren't side-effecting and temporaries are
+ -- single-assignment.
+ ok_to_skip = case stmt of
+ CmmNop -> True
+ CmmAssign (CmmLocal (LocalReg u' _)) rhs | u' /= u -> True
+ CmmAssign g@(CmmGlobal _) rhs -> not (g `regUsedIn` expr)
+ _other -> False
+
+
inlineStmt :: Unique -> CmmExpr -> CmmStmt -> CmmStmt
inlineStmt u a (CmmAssign r e) = CmmAssign r (inlineExpr u a e)
inlineStmt u a (CmmStore e1 e2) = CmmStore (inlineExpr u a e1) (inlineExpr u a e2)
-- -----------------------------------------------------------------------------
--- widening / narrowing
-
-narrowU :: Width -> Integer -> Integer
-narrowU W8 x = fromIntegral (fromIntegral x :: Word8)
-narrowU W16 x = fromIntegral (fromIntegral x :: Word16)
-narrowU W32 x = fromIntegral (fromIntegral x :: Word32)
-narrowU W64 x = fromIntegral (fromIntegral x :: Word64)
-narrowU _ _ = panic "narrowTo"
-
-narrowS :: Width -> Integer -> Integer
-narrowS W8 x = fromIntegral (fromIntegral x :: Int8)
-narrowS W16 x = fromIntegral (fromIntegral x :: Int16)
-narrowS W32 x = fromIntegral (fromIntegral x :: Int32)
-narrowS W64 x = fromIntegral (fromIntegral x :: Int64)
-narrowS _ _ = panic "narrowTo"
-
--- -----------------------------------------------------------------------------
-- Loopify for C
{-
-}
cmmLoopifyForC :: RawCmmTop -> RawCmmTop
-cmmLoopifyForC p@(CmmProc info entry_lbl [] (ListGraph blocks@(BasicBlock top_id _ : _)))
+cmmLoopifyForC p@(CmmProc info entry_lbl []
+ (ListGraph blocks@(BasicBlock top_id _ : _)))
| null info = p -- only if there's an info table, ignore case alts
| otherwise =
-- pprTrace "jump_lbl" (ppr jump_lbl <+> ppr entry_lbl) $