[PATCH] x86-64: Add RDI clobber to tls_local_dynamic_64 patterns

[H.J. Lu]

*tls_local_dynamic_64_<mode> uses RDI as the __tls_get_addr argument.
Add RDI clobber to tls_local_dynamic_64 patterns to show it.

PR target/120908
* config/i386/i386.cc (legitimize_tls_address): Pass RDI to
gen_tls_local_dynamic_64.
* config/i386/i386.md (*tls_local_dynamic_64_<mode>): Add RDI
clobber and use it to generate LEA.
(@tls_local_dynamic_64_<mode>): Add a clobber.

OK for master?

-- 
H.J.

From fcd3aedec394b514855a7a408fd20d394f39bbeb Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.to...@gmail.com>
Date: Thu, 3 Jul 2025 10:54:39 +0800
Subject: [PATCH] x86-64: Add RDI clobber to tls_local_dynamic_64 patterns

*tls_local_dynamic_64_<mode> uses RDI as the __tls_get_addr argument.
Add RDI clobber to tls_local_dynamic_64 patterns to show it.

	PR target/120908
	* config/i386/i386.cc (legitimize_tls_address): Pass RDI to
	gen_tls_local_dynamic_64.
	* config/i386/i386.md (*tls_local_dynamic_64_<mode>): Add RDI
	clobber and use it to generate LEA.
	(@tls_local_dynamic_64_<mode>): Add a clobber.

Signed-off-by: H.J. Lu <hjl.to...@gmail.com>
---
 gcc/config/i386/i386.cc | 3 ++-
 gcc/config/i386/i386.md | 8 +++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 9657c6ae31f..24aedc136a6 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -12616,12 +12616,13 @@ legitimize_tls_address (rtx x, enum tls_model model, bool for_mov)
 	  if (TARGET_64BIT)
 	    {
 	      rtx rax = gen_rtx_REG (Pmode, AX_REG);
+	      rtx rdi = gen_rtx_REG (Pmode, DI_REG);
 	      rtx_insn *insns;
 	      rtx eqv;
 
 	      start_sequence ();
 	      emit_call_insn
-		(gen_tls_local_dynamic_base_64 (Pmode, rax, caddr));
+		(gen_tls_local_dynamic_base_64 (Pmode, rax, caddr, rdi));
 	      insns = end_sequence ();
 
 	      /* Attach a unique REG_EQUAL, to allow the RTL optimizers to
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 370e79bb511..07d9a4cb653 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -23318,11 +23318,12 @@ (define_insn "*tls_local_dynamic_base_64_<mode>"
 	(call:P
 	 (mem:QI (match_operand 1 "constant_call_address_operand" "Bz"))
 	 (match_operand 2)))
-   (unspec:P [(reg:P SP_REG)] UNSPEC_TLS_LD_BASE)]
+   (unspec:P [(reg:P SP_REG)] UNSPEC_TLS_LD_BASE)
+   (clobber (match_operand:P 3 "register_operand" "=D"))]
   "TARGET_64BIT"
 {
   output_asm_insn
-    ("lea{q}\t{%&@tlsld(%%rip), %%rdi|rdi, %&@tlsld[rip]}", operands);
+    ("lea{q}\t{%&@tlsld(%%rip), %q3|%q3, %&@tlsld[rip]}", operands);
   if (TARGET_SUN_TLS)
     return "call\t%p1@plt";
   if (flag_plt || !HAVE_AS_IX86_TLS_GET_ADDR_GOT)
@@ -23359,7 +23360,8 @@ (define_expand "@tls_local_dynamic_base_64_<mode>"
 	   (call:P
 	    (mem:QI (match_operand 1))
 	    (const_int 0)))
-      (unspec:P [(reg:P SP_REG)] UNSPEC_TLS_LD_BASE)])]
+      (unspec:P [(reg:P SP_REG)] UNSPEC_TLS_LD_BASE)
+      (clobber (match_operand:P 2 "register_operand"))])]
   "TARGET_64BIT"
   "ix86_tls_descriptor_calls_expanded_in_cfun = true;")
 
-- 
2.50.0