x86-64: Add RDI clobber to tls_global_dynamic_64 patterns

*tls_global_dynamic_64_<mode> uses RDI as the __tls_get_addr argument.
Add RDI clobber to tls_global_dynamic_64 patterns to show it.

	PR target/120908
	* config/i386/i386.cc (legitimize_tls_address): Pass RDI to
	gen_tls_global_dynamic_64.
	* config/i386/i386.md (*tls_global_dynamic_64_<mode>): Add RDI
	clobber and use it to generate LEA.
	(@tls_global_dynamic_64_<mode>): Add a clobber.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit 7710d513a552f1fa1b7485ec6b318bafaa6d4cd7)

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 2e1a31d05403d1d87c6672049fcf442b0ddd40da..94e29fa43217ef5d08dab27618d6a6bc48f4303a 100644 (file)
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -12218,11 +12218,12 @@ 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;
 
              start_sequence ();
              emit_call_insn
-               (gen_tls_global_dynamic_64 (Pmode, rax, x, caddr));
+               (gen_tls_global_dynamic_64 (Pmode, rax, x, caddr, rdi));
              insns = get_insns ();
              end_sequence ();
 

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 78d75138721eb57141f8ee5c20ee7a536acec0b0..def39d1a729466083bb1b64e35e05a5eb867aa5e 100644 (file)
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -21114,7 +21114,8 @@
         (match_operand 3)))
    (unspec:P [(match_operand 1 "tls_symbolic_operand")
              (reg:P SP_REG)]
-            UNSPEC_TLS_GD)]
+            UNSPEC_TLS_GD)
+   (clobber (match_operand:P 4 "register_operand" "=D"))]
   "TARGET_64BIT"
 {
   if (!TARGET_X32)
@@ -21131,7 +21132,7 @@
        Use data16 prefix instead, which doesn't have this problem.  */
     fputs ("\tdata16", asm_out_file);
   output_asm_insn
-    ("lea{q}\t{%E1@tlsgd(%%rip), %%rdi|rdi, %E1@tlsgd[rip]}", operands);
+    ("lea{q}\t{%E1@tlsgd(%%rip), %q4|%q4, %E1@tlsgd[rip]}", operands);
   if (TARGET_SUN_TLS || flag_plt || !HAVE_AS_IX86_TLS_GET_ADDR_GOT)
     fputs (ASM_SHORT "0x6666\n", asm_out_file);
   else
@@ -21178,7 +21179,8 @@
           (const_int 0)))
      (unspec:P [(match_operand 1 "tls_symbolic_operand")
                (reg:P SP_REG)]
-              UNSPEC_TLS_GD)])]
+              UNSPEC_TLS_GD)
+     (clobber (match_operand:P 3 "register_operand"))])]
   "TARGET_64BIT"
   "ix86_tls_descriptor_calls_expanded_in_cfun = true;")