LoongArch: Remove unneeded "b 3f" instruction after LL-SC loops

This instruction is used to skip an redundant barrier if -mno-ld-seq-sa
or the memory model requires a barrier on failure.  But with -mld-seq-sa
and other memory models the barrier may be nonexisting at all, and we
should remove the "b 3f" instruction as well.

The implementation uses a new operand modifier "%T" to output a comment
marker if the operand is a memory order for which the barrier won't be
generated.  "%T", and also "%t", are not really used before and the code
for them in loongarch_print_operand_reloc is just some MIPS legacy.

gcc/ChangeLog:

	* config/loongarch/loongarch.cc (loongarch_print_operand_reloc):
	Make "%T" output a comment marker if the operand is a memory
	order for which the barrier won't be generated; remove "%t".
	* config/loongarch/sync.md (atomic_cas_value_strong<mode>): Add
	%T before "b 3f".
	(atomic_cas_value_cmp_and_7_<mode>): Likewise.

0 files changed, 0 insertions, 0 deletions