[Bug target/39137] [4.4 Regression] -mpreferred-stack-boundary=2 causes lots of dynamic realign

[jakub at gcc dot gnu dot org]

------- Comment #41 from jakub at gcc dot gnu dot org  2009-03-11 21:12 -------
Subject: Bug 39137

Author: jakub
Date: Wed Mar 11 21:12:33 2009
New Revision: 144792

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=144792
Log:
        PR target/39137
        * cfgexpand.c (get_decl_align_unit): Use LOCAL_DECL_ALIGNMENT
        macro.
        * defaults.h (LOCAL_DECL_ALIGNMENT): Define if not yet defined.
        * config/i386/i386.h (LOCAL_DECL_ALIGNMENT): Define.
        * config/i386/i386.c (ix86_local_alignment): For
        -m32 -mpreferred-stack-boundary=2 use 32-bit alignment for
        long long variables on the stack to avoid dynamic realignment.
        Allow the first argument to be a decl rather than type.
        * doc/tm.texi (LOCAL_DECL_ALIGNMENT): Document.

        * gcc.target/i386/stackalign/longlong-1.c: New test.
        * gcc.target/i386/stackalign/longlong-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/stackalign/longlong-1.c
    trunk/gcc/testsuite/gcc.target/i386/stackalign/longlong-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cfgexpand.c
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.h
    trunk/gcc/defaults.h
    trunk/gcc/doc/tm.texi
    trunk/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39137