[commit: ghc] master: Remove obsolete comment in cmmOffset (d01844f)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/d01844f145263a038235684900bc7228a799ca6d/ghc

>---------------------------------------------------------------

commit d01844f145263a038235684900bc7228a799ca6d
Author: Joachim Breitner <mail at joachim-breitner.de>
Date:   Mon Mar 9 16:04:42 2015 +0100

    Remove obsolete comment in cmmOffset
    
    Summary:
    as obviously, the code does _not_ adhere to the comment, and yet the
    compiler does _not_ go into an infinite loop.
    
    Test Plan: Run validate
    
    Reviewers: austin
    
    Subscribers: thomie
    
    Differential Revision: https://phabricator.haskell.org/D719


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d01844f145263a038235684900bc7228a799ca6d
 compiler/cmm/CmmUtils.hs | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/compiler/cmm/CmmUtils.hs b/compiler/cmm/CmmUtils.hs
index 65d633e..3ddb9ec 100644
--- a/compiler/cmm/CmmUtils.hs
+++ b/compiler/cmm/CmmUtils.hs
@@ -205,13 +205,6 @@ cmmOffsetExpr :: DynFlags -> CmmExpr -> CmmExpr -> CmmExpr
 cmmOffsetExpr dflags e (CmmLit (CmmInt n _)) = cmmOffset dflags e (fromInteger n)
 cmmOffsetExpr dflags e byte_off = CmmMachOp (MO_Add (cmmExprWidth dflags e)) [e, byte_off]
 
--- NB. Do *not* inspect the value of the offset in these smart constructors!!!
--- because the offset is sometimes involved in a loop in the code generator
--- (we don't know the real Hp offset until we've generated code for the entire
--- basic block, for example).  So we cannot eliminate zero offsets at this
--- stage; they're eliminated later instead (either during printing or
--- a later optimisation step on Cmm).
---
 cmmOffset :: DynFlags -> CmmExpr -> Int -> CmmExpr
 cmmOffset _ e                 0        = e
 cmmOffset _ (CmmReg reg)      byte_off = cmmRegOff reg byte_off