[Bug target/20020] x86_64 - 128 bit structs not targeted to TImode

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20020

--- Comment #38 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-15 
08:57:51 UTC ---
What are the code generation deficiencies you are targeting with this?  For
testcase #1 I get

sptr_result:
.LFB0:
        .cfi_startproc
        movq    S+8(%rip), %rdx
        movq    S(%rip), %rax
        ret

what would you expect instead?

I don't think we should change MAX_FIXED_MODE_SIZE, nor make use of
TImode unconditionally.