[SPARC] Fix PR target/93704

[SPARC] Fix PR target/93704

[Eric Botcazou]

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This is an old thinko pertaining to the interaction between TLS sequences and 
delay slot filling: the compiler knows that it cannot put instructions with 
TLS relocations into delay slots with the original Sun TLS model, but it tests 
TARGET_SUN_TLS in this context, which depends only on the assembler.  So if 
the compiler is configured with the GNU assembler and the Solaris linker, then 
TARGET_GNU_TLS is set instead and the limitation is not enforced.

Tested on SPARC/Solaris and SPARC64/Linux, applied on all active branches.


2020-02-14  Eric Botcazou  <ebotcazou@adacore.com>

	PR target/93704
	* config/sparc/sparc.c (eligible_for_call_delay): Test HAVE_GNU_LD in
	conjunction with TARGET_GNU_TLS in early return.

-- 
Eric Botcazou

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diff --git a/gcc/config/sparc/sparc.c b/gcc/config/sparc/sparc.c
index 7e05e1a6f82..aefced85fe1 100644
--- a/gcc/config/sparc/sparc.c
+++ b/gcc/config/sparc/sparc.c
@@ -3959,11 +3959,8 @@ eligible_for_call_delay (rtx_insn *trial)
   if (get_attr_in_branch_delay (trial) == IN_BRANCH_DELAY_FALSE)
     return 0;
 
-  /* Binutils allows
-       call __tls_get_addr, %tgd_call (foo)
-        add %l7, %o0, %o0, %tgd_add (foo)
-     while Sun as/ld does not.  */
-  if (TARGET_GNU_TLS || !TARGET_TLS)
+  /* The only problematic cases are TLS sequences with Sun as/ld.  */
+  if ((TARGET_GNU_TLS && HAVE_GNU_LD) || !TARGET_TLS)
     return 1;
 
   pat = PATTERN (trial);