- = do stmtC (setInfo addr (CmmLit (CmmLabel mkMAP_DIRTY_infoLabel)))
- mkBasicIndexedWrite arrPtrsHdrSize Nothing bWord addr idx val
-
+ = do mkBasicIndexedWrite arrPtrsHdrSize Nothing bWord addr idx val
+ stmtC (setInfo addr (CmmLit (CmmLabel mkMAP_DIRTY_infoLabel)))
+ -- the write barrier. We must write a byte into the mark table:
+ -- bits8[a + header_size + StgMutArrPtrs_size(a) + x >> N]
+ stmtC $ CmmStore (
+ cmmOffsetExpr
+ (cmmOffsetExprW (cmmOffsetB addr arrPtrsHdrSize)
+ (loadArrPtrsSize addr))
+ (CmmMachOp mo_wordUShr [idx,
+ CmmLit (mkIntCLit mUT_ARR_PTRS_CARD_BITS)])
+ ) (CmmLit (CmmInt 1 W8))
+
+loadArrPtrsSize :: CmmExpr -> CmmExpr
+loadArrPtrsSize addr = CmmLoad (cmmOffsetB addr off) bWord
+ where off = fixedHdrSize*wORD_SIZE + oFFSET_StgMutArrPtrs_ptrs