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i386: Remove workaround for Solaris ld 64-bit TLS IE limitation

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As detailed in PR target/43309, the Solaris linker initially took the
64-bit x86 TLS IE code sequence literally, assuming that the spec only
allowed %rax as target register.

A workaround has been in place for more than a decade, but is no longer
necessary.  The bug had already been fixed for Solaris 11.1, while trunk
requires Solaris 11.4.

Uros pointed this out and suggested the attached patch.

Bootstrapped without regressions on i386-pc-solaris2.11.

2024-10-15  Uros Bizjak  <ubizjak@gmail.com>

	gcc:
	* config/i386/i386.cc (legitimize_tls_address)
	<TLS_MODEL_INITIAL_EXEC>: Remove 64-bit Solaris ld workaround.
	* config/i386/i386.md (UNSPEC_TLS_IE_SUN): Remove.
	(tls_initial_exec_64_sun): Remove.
This commit is contained in:
Uros Bizjak 2024-11-20 12:57:25 +01:00 committed by Rainer Orth
parent bf57f9b599
commit 086ee8d086
2 changed files with 0 additions and 28 deletions
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11
gcc/config/i386/i386.cc
View File

@ -12320,17 +12320,6 @@ legitimize_tls_address (rtx x, enum tls_model model, bool for_mov)
case TLS_MODEL_INITIAL_EXEC:
if (TARGET_64BIT)
{
if (TARGET_SUN_TLS && !TARGET_X32)
{
/* The Sun linker took the AMD64 TLS spec literally
and can only handle %rax as destination of the
initial executable code sequence. */
dest = gen_reg_rtx (DImode);
emit_insn (gen_tls_initial_exec_64_sun (dest, x));
return dest;
}
/* Generate DImode references to avoid %fs:(%reg32)
problems and linker IE->LE relaxation bug. */
tp_mode = DImode;

17
gcc/config/i386/i386.md
View File

@ -93,7 +93,6 @@
UNSPEC_TLS_GD
UNSPEC_TLS_LD_BASE
UNSPEC_TLSDESC
UNSPEC_TLS_IE_SUN
;; Other random patterns
UNSPEC_SCAS
@ -22876,22 +22875,6 @@
set_mem_addr_space (operands[2], as);
})
;; The Sun linker took the AMD64 TLS spec literally and can only handle
;; %rax as destination of the initial executable code sequence.
(define_insn "tls_initial_exec_64_sun"
[(set (match_operand:DI 0 "register_operand" "=a")
(unspec:DI
[(match_operand 1 "tls_symbolic_operand")]
UNSPEC_TLS_IE_SUN))
(clobber (reg:CC FLAGS_REG))]
"TARGET_64BIT && TARGET_SUN_TLS"
{
output_asm_insn
("mov{q}\t{%%fs:0, %0|%0, QWORD PTR fs:0}", operands);
return "add{q}\t{%a1@gottpoff(%%rip), %0|%0, %a1@gottpoff[rip]}";
}
[(set_attr "type" "multi")])
;; GNU2 TLS patterns can be split.
(define_expand "tls_dynamic_gnu2_32"