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| author | Junxian Zhu <zhujunxian@oss.cipunited.com> | 2023-02-17 16:24:55 +0800 |
|---|---|---|
| committer | YunQiang Su <yunqiang.su@cipunited.com> | 2023-02-24 11:19:55 +0800 |
| commit | a3a45f0b145ae9381ce3daa75db17c43a76ec7fd (patch) | |
| tree | 15f48ce9632a858176598a39e125ff1c5c8468b8 /gcc/config/mips/mips.cc | |
| parent | e2b20ed3efd22acaabfa87fd07869045747bd7f9 (diff) | |
| download | gcc-a3a45f0b145ae9381ce3daa75db17c43a76ec7fd.zip gcc-a3a45f0b145ae9381ce3daa75db17c43a76ec7fd.tar.gz gcc-a3a45f0b145ae9381ce3daa75db17c43a76ec7fd.tar.bz2 | |
Hazard barrier return support
This patch allows a function to request clearing of all instruction and execution
hazards upon normal return via __attribute__ ((use_hazard_barrier_return)).
2017-04-25 Prachi Godbole <prachi.godbole@imgtec.com>
gcc/ChangeLog:
* config/mips/mips.h (machine_function): New variable
use_hazard_barrier_return_p.
* config/mips/mips.md (UNSPEC_JRHB): New unspec.
(mips_hb_return_internal): New insn pattern.
* config/mips/mips.cc (mips_attribute_table): Add attribute
use_hazard_barrier_return.
(mips_use_hazard_barrier_return_p): New static function.
(mips_function_attr_inlinable_p): Likewise.
(mips_compute_frame_info): Set use_hazard_barrier_return_p.
Emit error for unsupported architecture choice.
(mips_function_ok_for_sibcall, mips_can_use_return_insn):
Return false for use_hazard_barrier_return.
(mips_expand_epilogue): Emit hazard barrier return.
* doc/extend.texi: Document use_hazard_barrier_return.
gcc/testsuite/ChangeLog:
* gcc.target/mips/hazard-barrier-return-attribute.c: New test.
Signed-off-by: Junxian Zhu <zhujunxian@oss.cipunited.com>
Diffstat (limited to 'gcc/config/mips/mips.cc')
| -rw-r--r-- | gcc/config/mips/mips.cc | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/config/mips/mips.cc b/gcc/config/mips/mips.cc index 0b25db47..b066a2c 100644 --- a/gcc/config/mips/mips.cc +++ b/gcc/config/mips/mips.cc @@ -630,6 +630,7 @@ static const struct attribute_spec mips_attribute_table[] = { mips_handle_use_shadow_register_set_attr, NULL }, { "keep_interrupts_masked", 0, 0, false, true, true, false, NULL, NULL }, { "use_debug_exception_return", 0, 0, false, true, true, false, NULL, NULL }, + { "use_hazard_barrier_return", 0, 0, true, false, false, false, NULL, NULL }, { NULL, 0, 0, false, false, false, false, NULL, NULL } }; |