X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2FCmmOpt.hs;h=b96aa4aa8910ec70a2916b6644a825414911bcb5;hp=379d7a2996c2766b18b752956e7c289f80672296;hb=ae72991e2f0343c075a30c0a5a7d4ac18e9ef500;hpb=55030d7a875891de3ae2ccf4673711d1eae090ce

diff --git a/compiler/cmm/CmmOpt.hs b/compiler/cmm/CmmOpt.hs
index 379d7a2..b96aa4a 100644
--- a/compiler/cmm/CmmOpt.hs
+++ b/compiler/cmm/CmmOpt.hs
@@ -102,6 +102,11 @@ cmmMiniInline blocks = map do_inline blocks
 cmmMiniInlineStmts :: UniqFM Int -> [CmmStmt] -> [CmmStmt]
 cmmMiniInlineStmts uses [] = []
 cmmMiniInlineStmts uses (stmt@(CmmAssign (CmmLocal (LocalReg u _ _)) expr) : stmts)
+        -- not used at all: just discard this assignment
+  | Nothing <- lookupUFM uses u
+  = cmmMiniInlineStmts uses stmts
+
+        -- used once: try to inline at the use site
   | Just 1 <- lookupUFM uses u,
     Just stmts' <- lookForInline u expr stmts
   =