From: Richard Henderson <r...@redhat.com>
Date: Mon, 14 Sep 2015 10:20:00 -0700
> There's a possibility of benefit though -- br and movr only work with DImode.
> You may want to examine the generated code to decide one way or another.
>
> It's possible that the extra comparison instructions don't really matter
> compared with the larger spill slot, but you never know...
And another issue is that I get expr.c:expand_expr_real_1() assertion
failures when I try to use SImode for 64-bit, specifically the one in
this code sequence:
/* Get the signedness to be used for this variable. Ensure we get
the same mode we got when the variable was declared. */
if (code != SSA_NAME)
pmode = promote_decl_mode (exp, &unsignedp);
else if ((g = SSA_NAME_DEF_STMT (ssa_name))
&& gimple_code (g) == GIMPLE_CALL
&& !gimple_call_internal_p (g))
pmode = promote_function_mode (type, mode, &unsignedp,
gimple_call_fntype (g),
2);
else
pmode = promote_ssa_mode (ssa_name, &unsignedp);
gcc_assert (GET_MODE (decl_rtl) == pmode);
There are some other issues I'm having troubles resolving for 64-bit
native bootstraps as well, and I am probably going to revert the LRA
sparc changes unless I can resolve them by the end of today.
