Re: [PATCH v5] LoongArch: Add support for TLS descriptors

[chenglulu <chenglulu@loongson.cn>]

在 2024/4/1 下午9:51, Xi Ruoyao 写道:
> Is this patch targeting GCC 14 or 15?  If 14 I guess we'd commit now...
>
> Generally we don't add features in stage 4, but if we keep trad as the
> default I think it'd be OK.  And RISC-V guys plan to push their TLS desc
> implementation this week too.

I've rebase the code to the latest commit, and if the test is okay I'll 
bring it up right away.

Thanks!:-)

>
> On Tue, 2024-03-19 at 09:54 +0800, mengqinggang wrote:
>> Add support for TLS descriptors on normal code model and extreme code model.
>>
>> Normal code model instruction sequence:
>>    -mno-explicit-relocs:
>>      la.tls.desc	$r4, s
>>      add.d	$r12, $r4, $r2
>>    -mexplicit-relocs:
>>      pcalau12i	$r4,%desc_pc_hi20(s)
>>      addi.d	$r4,$r4,%desc_pc_lo12(s)
>>      ld.d	$r1,$r4,%desc_ld(s)
>>      jirl	$r1,$r1,%desc_call(s)
>>      add.d	$r12, $r4, $r2
>>
>> Extreme code model instruction sequence:
>>    -mno-explicit-relocs:
>>      la.tls.desc	$r4, $r12, s
>>      add.d	$r12, $r4, $r2
>>    -mexplicit-relocs:
>>      pcalau12i	$r4,%desc_pc_hi20(s)
>>      addi.d	$r12,$r0,%desc_pc_lo12(s)
>>      lu32i.d	$r12,%desc64_pc_lo20(s)
>>      lu52i.d	$r12,$r12,%desc64_pc_hi12(s)
>>      add.d	$r4,$r4,$r12
>>      ld.d	$r1,$r4,%desc_ld(s)
>>      jirl	$r1,$r1,%desc_call(s)
>>      add.d	$r12, $r4, $r2
>>
>> The default is still traditional TLS model, but can be configured with
>> --with-tls={trad,desc}. The default can change to TLS descriptors once
>> libc and LLVM support this.
>>
>> gcc/ChangeLog:
>>
>> 	* config.gcc: Add --with-tls option to change TLS flavor.
>> 	* config/loongarch/genopts/loongarch.opt.in: Add -mtls-dialect to
>> 	configure TLS flavor.
>> 	* config/loongarch/loongarch-def.h (struct loongarch_target): Add
>> 	tls_dialect.
>> 	* config/loongarch/loongarch-driver.cc (la_driver_init): Add tls
>> 	flavor.
>> 	* config/loongarch/loongarch-opts.cc (loongarch_init_target): Add
>> 	tls_dialect.
>> 	(loongarch_config_target): Ditto.
>> 	(loongarch_update_gcc_opt_status): Ditto.
>> 	* config/loongarch/loongarch-opts.h (loongarch_init_target):Ditto.
>> 	(TARGET_TLS_DESC): New define.
>> 	* config/loongarch/loongarch.cc (loongarch_symbol_insns): Add TLS DESC
>> 	instructions sequence length.
>> 	(loongarch_legitimize_tls_address): New TLS DESC instruction sequence.
>> 	(loongarch_option_override_internal): Add la_opt_tls_dialect.
>> 	(loongarch_option_restore): Add la_target.tls_dialect.
>> 	* config/loongarch/loongarch.md (@got_load_tls_desc<mode>): Normal
>> 	code model for TLS DESC.
>> 	(got_load_tls_desc_off64): Extreme code model for TLS DESC.
>> 	* config/loongarch/loongarch.opt: Regenerated.
>>
>> gcc/testsuite/ChangeLog:
>>
>> 	* gcc.target/loongarch/cmodel-extreme-1.c: Add -mtls-dialect=trad.
>> 	* gcc.target/loongarch/cmodel-extreme-2.c: Ditto.
>> 	* gcc.target/loongarch/explicit-relocs-auto-tls-ld-gd.c: Ditto.
>> 	* gcc.target/loongarch/explicit-relocs-medium-call36-auto-tls-ld-gd.c:
>> 	Ditto.
>> 	* gcc.target/loongarch/func-call-medium-1.c: Ditto.
>> 	* gcc.target/loongarch/func-call-medium-2.c: Ditto.
>> 	* gcc.target/loongarch/func-call-medium-3.c: Ditto.
>> 	* gcc.target/loongarch/func-call-medium-4.c: Ditto.
>> 	* gcc.target/loongarch/tls-extreme-macro.c: Ditto.
>> 	* gcc.target/loongarch/tls-gd-noplt.c: Ditto.
>> 	* gcc.target/loongarch/explicit-relocs-auto-extreme-tls-desc.c: New test.
>> 	* gcc.target/loongarch/explicit-relocs-auto-tls-desc.c: New test.
>> 	* gcc.target/loongarch/explicit-relocs-extreme-tls-desc.c: New test.
>> 	* gcc.target/loongarch/explicit-relocs-tls-desc.c: New test.
>>
>> Co-authored-by: Lulu Cheng <chenglulu@loongson.cn>
>> Co-authored-by: Xi Ruoyao <xry111@xry111.site>