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* gcc/config/i386/i386.opt (-mstackrealign): New flag. * gcc/config/i386/i386.c (force_align_arg_pointer): New attribute. (ix86_handle_cconv_attribute): Emit error when force_align_arg_pointer attribute collides with too many regparms. (ix86_function_regparm): Limit regparms when used with force_align_arg_pointer attribute. (ix86_internal_arg_pointer): Support stack-realigning prologue in non-main functions. Emit warning for nested functions under -mstackrealign, emit error for nested functions with force_align_arg_pointer attribute. * gcc/doc/extend.texi (force_align_arg_pointer): Document it. * gcc/doc/invoke.texi (-mstackrealign): Document it. * testsuite/gcc.target/i386/20060512-1.c: New. * testsuite/gcc.target/i386/20060512-2.c: New. * testsuite/gcc.target/i386/20060512-3.c: New. * testsuite/gcc.target/i386/20060512-4.c: New. From-SVN: r113880
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