From 2b3ded42e21a97f7d4a04f13280cc3eeb98f60ca Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Fri, 17 Sep 2010 18:00:40 +0000 Subject: Make sure that all variable sized adjustments are multiple of preferred stack boundary after stack alignment. gcc/ 2010-09-17 H.J. Lu PR middle-end/45234 * calls.c (expand_call): Make sure that all variable sized adjustments are multiple of preferred stack boundary after stack alignment. gcc/testsuite/ 2010-09-17 H.J. Lu PR middle-end/45234 * gcc.dg/torture/stackalign/alloca-5.c: New. From-SVN: r164377 --- gcc/calls.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'gcc/calls.c') diff --git a/gcc/calls.c b/gcc/calls.c index 3888831..b3109cee 100644 --- a/gcc/calls.c +++ b/gcc/calls.c @@ -2385,6 +2385,19 @@ expand_call (tree exp, rtx target, int ignore) preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; + if (SUPPORTS_STACK_ALIGNMENT) + { + /* All variable sized adjustments must be multiple of preferred + stack boundary. Stack alignment may change preferred stack + boundary after variable sized adjustments have been made. We + need to compensate it here. */ + unsigned HOST_WIDE_INT delta + = ((stack_pointer_delta - pending_stack_adjust) + % preferred_unit_stack_boundary); + if (delta) + anti_adjust_stack (GEN_INT (preferred_unit_stack_boundary - delta)); + } + /* We want to make two insn chains; one for a sibling call, the other for a normal call. We will select one of the two chains after initial RTL generation is complete. */ -- cgit v1.1