Pointer Tagging

[ghc-hetmet.git] / compiler / cmm / PprC.hs

diff --git a/compiler/cmm/PprC.hs b/compiler/cmm/PprC.hs
index 77d337d..6032dc2 100644 (file)
--- a/compiler/cmm/PprC.hs
+++ b/compiler/cmm/PprC.hs
@@ -322,8 +322,9 @@ pprExpr e = case e of
        -> char '*' <> pprAsPtrReg r
 
     CmmLoad (CmmRegOff r off) rep
-       | isPtrReg r && rep == wordRep 
+       | isPtrReg r && rep == wordRep && (off `rem` wORD_SIZE == 0)
        -- ToDo: check that the offset is a word multiple?
+        --       (For tagging to work, I had to avoid unaligned loads. --ARY)
        -> pprAsPtrReg r <> brackets (ppr (off `shiftR` wordShift))
 
     CmmLoad expr rep ->