------- Comment #23 from steven at gcc dot gnu dot org 2008-02-06 09:00 ------- The IS_STACK_MODE trick is mine, and if this affects SSE code generation, the bug is that IS_STACK_MODE returns true for registers that will not go on the stack.
I acknowledge the IS_STACK_MODE is a big hammer, but we tested extensively before committing it. We have no easy way to know if any registers are carried over the loop. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23322
