[PATCH v5 3/5] LoongArch: Enable explicit reloc for extreme TLS GD/LD with -mexplicit-relocs=auto.

[Lulu Cheng <chenglulu@loongson.cn>]

Binutils does not support relaxation using four instructions to obtain
symbol addresses

gcc/ChangeLog:

	* config/loongarch/loongarch.cc (loongarch_explicit_relocs_p):
	When the code model of the symbol is extreme and -mexplicit-relocs=auto,
	the macro instruction loading symbol address is not applicable.
	(loongarch_call_tls_get_addr): Adjust code.
	(loongarch_legitimize_tls_address): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/loongarch/explicit-relocs-extreme-auto-tls-ld-gd.c: New test.
	* gcc.target/loongarch/explicit-relocs-medium-auto-tls-ld-gd.c: New test.
---
 gcc/config/loongarch/loongarch.cc             | 19 +++++++++----------
 .../explicit-relocs-extreme-auto-tls-ld-gd.c  |  5 +++++
 .../explicit-relocs-medium-auto-tls-ld-gd.c   |  5 +++++
 3 files changed, 19 insertions(+), 10 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/loongarch/explicit-relocs-extreme-auto-tls-ld-gd.c
 create mode 100644 gcc/testsuite/gcc.target/loongarch/explicit-relocs-medium-auto-tls-ld-gd.c

diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc
index a0c14f908a8..684ae81870c 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -1971,6 +1971,10 @@ loongarch_explicit_relocs_p (enum loongarch_symbol_type type)
   if (la_opt_explicit_relocs != EXPLICIT_RELOCS_AUTO)
     return la_opt_explicit_relocs == EXPLICIT_RELOCS_ALWAYS;
 
+  /* The linker don't know how to relax accesses in extreme code model.  */
+  if (loongarch_symbol_extreme_p (type))
+    return true;
+
   switch (type)
     {
       case SYMBOL_TLS_IE:
@@ -1982,11 +1986,6 @@ loongarch_explicit_relocs_p (enum loongarch_symbol_type type)
 	   does not relax 64-bit pc-relative accesses as at now.  */
 	return true;
       case SYMBOL_GOT_DISP:
-	/* The linker don't know how to relax GOT accesses in extreme
-	   code model.  */
-	if (TARGET_CMODEL_EXTREME)
-	  return true;
-
 	/* If we are performing LTO for a final link, and we have the
 	   linker plugin so we know the resolution of the symbols, then
 	   all GOT references are binding to external symbols or
@@ -2776,7 +2775,7 @@ loongarch_call_tls_get_addr (rtx sym, enum loongarch_symbol_type type, rtx v0)
 
   start_sequence ();
 
-  if (la_opt_explicit_relocs == EXPLICIT_RELOCS_ALWAYS)
+  if (loongarch_explicit_relocs_p (type))
     {
       /* Split tls symbol to high and low.  */
       rtx high = gen_rtx_HIGH (Pmode, copy_rtx (loc));
@@ -2809,7 +2808,7 @@ loongarch_call_tls_get_addr (rtx sym, enum loongarch_symbol_type type, rtx v0)
 	case CMODEL_MEDIUM:
 	    {
 	      rtx reg = gen_reg_rtx (Pmode);
-	      if (TARGET_EXPLICIT_RELOCS)
+	      if (la_opt_explicit_relocs != EXPLICIT_RELOCS_NONE)
 		{
 		  emit_insn (gen_pcalau12i (Pmode, reg, loongarch_tls_symbol));
 		  rtx call = gen_call_value_internal_1 (Pmode, v0, reg,
@@ -2845,7 +2844,7 @@ loongarch_call_tls_get_addr (rtx sym, enum loongarch_symbol_type type, rtx v0)
 	case CMODEL_NORMAL:
 	case CMODEL_MEDIUM:
 	    {
-	      if (TARGET_EXPLICIT_RELOCS)
+	      if (loongarch_explicit_relocs_p (SYMBOL_GOT_DISP))
 		{
 		  rtx high = gen_reg_rtx (Pmode);
 		  loongarch_emit_move (high,
@@ -2939,7 +2938,7 @@ loongarch_legitimize_tls_address (rtx loc)
 	  tmp1 = gen_reg_rtx (Pmode);
 	  tmp2 = loongarch_unspec_address (loc, SYMBOL_TLS_IE);
 	  dest = gen_reg_rtx (Pmode);
-	  if (la_opt_explicit_relocs != EXPLICIT_RELOCS_NONE)
+	  if (loongarch_explicit_relocs_p (SYMBOL_TLS_IE))
 	    {
 	      tmp3 = gen_reg_rtx (Pmode);
 	      rtx high = gen_rtx_HIGH (Pmode, copy_rtx (tmp2));
@@ -2996,7 +2995,7 @@ loongarch_legitimize_tls_address (rtx loc)
 	  tmp2 = loongarch_unspec_address (loc, SYMBOL_TLS_LE);
 	  dest = gen_reg_rtx (Pmode);
 
-	  if (la_opt_explicit_relocs != EXPLICIT_RELOCS_NONE)
+	  if (loongarch_explicit_relocs_p (SYMBOL_TLS_LE))
 	    {
 	      tmp3 = gen_reg_rtx (Pmode);
 	      rtx high = gen_rtx_HIGH (Pmode, copy_rtx (tmp2));
diff --git a/gcc/testsuite/gcc.target/loongarch/explicit-relocs-extreme-auto-tls-ld-gd.c b/gcc/testsuite/gcc.target/loongarch/explicit-relocs-extreme-auto-tls-ld-gd.c
new file mode 100644
index 00000000000..35bd4570a9e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/explicit-relocs-extreme-auto-tls-ld-gd.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fPIC -mexplicit-relocs=auto -mcmodel=extreme -fno-plt" } */
+/* { dg-final { scan-assembler-not "la.tls.\[lg\]d" { target tls_native } } } */
+
+#include "./explicit-relocs-auto-tls-ld-gd.c"
diff --git a/gcc/testsuite/gcc.target/loongarch/explicit-relocs-medium-auto-tls-ld-gd.c b/gcc/testsuite/gcc.target/loongarch/explicit-relocs-medium-auto-tls-ld-gd.c
new file mode 100644
index 00000000000..47bffae8af7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/explicit-relocs-medium-auto-tls-ld-gd.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fPIC -mexplicit-relocs=auto -mcmodel=medium -fplt" } */
+/* { dg-final { scan-assembler-not "la.global" { target tls_native } } } */
+
+#include "./explicit-relocs-auto-tls-ld-gd.c"
-- 
2.39.3