x86-64: Use UNSPEC_DTPOFF to check source operand in TLS64_COMBINE

Since the first operand of PLUS in the source of TLS64_COMBINE pattern:

(set (reg/f:DI 128)
    (plus:DI (unspec:DI [
                (symbol_ref:DI ("_TLS_MODULE_BASE_") [flags 0x10])
                (reg:DI 126)
                (reg/f:DI 7 sp)
            ] UNSPEC_TLSDESC)
        (const:DI (unspec:DI [
                    (symbol_ref:DI ("bfd_error") [flags 0x1a] <var_decl 0x7fffe99d6e40 bfd_error>)
                ] UNSPEC_DTPOFF))))

is unused, use the second operand of PLUS:

(const:DI (unspec:DI [
            (symbol_ref:DI ("bfd_error") [flags 0x1a] <var_decl 0x7fffe99d6e40 bfd_error>)
        ] UNSPEC_DTPOFF))

to check if 2 TLS_COMBINE patterns have the same source.

gcc/

	PR target/121725
	* config/i386/i386-features.cc
	(pass_x86_cse::candidate_gnu2_tls_p): Use the UNSPEC_DTPOFF
	operand to check source operand in TLS64_COMBINE pattern.

gcc/testsuite/

	PR target/121725
	* gcc.target/i386/pr121725-1a.c: New test.
	* gcc.target/i386/pr121725-1b.c: Likewise.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

0 files changed, 0 insertions, 0 deletions