Bernd Schmidt wrote:
My gut feeling is that this example will work as a consequence.
... note that I inserted <some other insn> which could conceivably use
R9 as an input reload, as the hard reg is dead. Where would we
invalidate previous information about R9? I assume it would be the loop
at the end of emit_reload_insns, specifically
/* First, clear out memory of what used to be in this
spill reg.
If consecutive registers are used, clear them all. */
for (k = 0; k < nr; k++)
{
CLEAR_HARD_REG_BIT (reg_reloaded_valid, i + k);
CLEAR_HARD_REG_BIT (reg_reloaded_call_part_clobbered,
i + k);
Why isn't this triggering?
This code is guarded by
/* I is nonneg if this reload used a register.
If rld[r].reg_rtx is 0, this is an optional reload
that we opted to ignore. */
if (i >= 0 && rld[r].reg_rtx != 0)
and in this [my original] case, i is negative (see my original patch).
I don't understand the "I is nonneg ..." comment above: the surrounding
code seems to say that i is actually non-negative if the reload used a
_spill_ register (rather than just any register). Bernd, could you
clarify the precise meaning of "spill register" in this context? I've
not yet managed to completely pin this down.
Mark
