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List:       gcc-bugs
Subject:    [Bug target/45250] [4.6 Regression] FAIL: tr1/5_numerical_facilities/special_functions/01_assoc_lagu
From:       "jakub at gcc dot gnu dot org" <gcc-bugzilla () gcc ! gnu ! org>
Date:       2010-08-31 19:48:18
Message-ID: 20100831194818.12228.qmail () sourceware ! org
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------- Comment #7 from jakub at gcc dot gnu dot org  2010-08-31 19:48 -------
Created an attachment (id=21614)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21614&action=view)
gcc46-pr45250.patch

The problem is that the PA backend has quite lame setup, where
FRAME_POINTER_REGNUM is the same as HARD_FRAME_POINTER_REGNUM and
ARG_POINTER_REGNUM, thus the replacements var-tracking is doing in order to
decrease size of loclists and use DW_OP_fbreg where possible, aren't reliable,
as the testcase shows, because the same hard register can be used for arbitrary
other data.  The following patch fixes it by not doing the replacements on PA
and similar targets at all when doing VALUE based var-tracking.  Ideally PA
backend would be fixed up to use different (fixed) hard regno, made up and
always eliminated, for FRAME_POINTER_REGNUM.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45250

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