X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FbasicTypes%2FLiteral.lhs;fp=ghc%2Fcompiler%2FbasicTypes%2FLiteral.lhs;h=2167ba025753d81722ca7957bfe6c21973156489;hb=fcfe16433bd582d0e00404ea652806d13d14103c;hp=7df6fca9bdfe9129aff7dd76ad9f291452029433;hpb=f682290809d7641e3f8ec188eec9109193189ba1;p=ghc-hetmet.git

diff --git a/ghc/compiler/basicTypes/Literal.lhs b/ghc/compiler/basicTypes/Literal.lhs
index 7df6fca..2167ba0 100644
--- a/ghc/compiler/basicTypes/Literal.lhs
+++ b/ghc/compiler/basicTypes/Literal.lhs
@@ -13,6 +13,7 @@ module Literal
 	, hashLiteral
 
 	, inIntRange, inWordRange, tARGET_MAX_INT, inCharRange
+	, isZeroLit,
 
 	, word2IntLit, int2WordLit
 	, narrow8IntLit, narrow16IntLit, narrow32IntLit
@@ -163,6 +164,15 @@ inWordRange x = x >= 0		    && x <= tARGET_MAX_WORD
 
 inCharRange :: Int -> Bool
 inCharRange c =  c >= 0 && c <= tARGET_MAX_CHAR
+
+isZeroLit :: Literal -> Bool
+isZeroLit (MachInt    0) = True
+isZeroLit (MachInt64  0) = True
+isZeroLit (MachWord   0) = True
+isZeroLit (MachWord64 0) = True
+isZeroLit (MachFloat  0) = True
+isZeroLit (MachDouble 0) = True
+isZeroLit other		 = False
 \end{code}
 
 	Coercions