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Re: [PATCH] Fix PR 20606 and PR 24069
On Oct 4, 2005, Richard Henderson <rth@redhat.com> wrote:
> On Sun, Oct 02, 2005 at 02:37:14PM -0400, Andrew Pinski wrote:
>> The problem here is that we have an indirect jump to a label.
>> JUMP_LABEL (insn) will be NULL but we will have a reg note REG_LABEL
>> for the label. This patch fixes the problem by using that reg note.
> If it's an indirect jump, JUMP_LABEL will never be set. This
> is correct. Whether or not there's a REG_LABEL is irrelevant.
Not really. REG_LABEL was introduced precisely to hold a label for
indirect jumps that are always targeted at the same address, as needed
by SH5's jump sequences, that start with a high-latency PT instruction
that loads a branch target into a target register, and finally a
branch instruction that requires a target register.
> Why isn't this recognized as a computed_jump_p?
Because if there is a REG_LABEL, it is not a computed jump, it's a
jump to that label.
--
Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist oliva@{lsd.ic.unicamp.br, gnu.org}