[PATCH v3] LoongArch: gas: Simplify relocations in sections without code flag

[Jinyang He]

Gas should not emit ADD/SUB relocation pairs for label differences
if they are in the same section without code flag even relax enabled.
Because the real value is not be affected by relaxation and it can be
compute out in assembly stage. Thus, correct the `TC_FORCE_RELOCATION
_SUB_SAME` and the label differences in same section without code
flag can be resolved in fixup_segment().
---
v2: Improve the commit info.
v3: Skip loongarch32.

 gas/config/tc-loongarch.h                      |  4 +---
 gas/testsuite/gas/loongarch/relax_debug_line.d | 12 ++++++++++++
 gas/testsuite/gas/loongarch/relax_debug_line.s |  6 ++++++
 3 files changed, 19 insertions(+), 3 deletions(-)
 create mode 100644 gas/testsuite/gas/loongarch/relax_debug_line.d
 create mode 100644 gas/testsuite/gas/loongarch/relax_debug_line.s

diff --git a/gas/config/tc-loongarch.h b/gas/config/tc-loongarch.h
index e0d0962e5f0..e1ef42c1314 100644
--- a/gas/config/tc-loongarch.h
+++ b/gas/config/tc-loongarch.h
@@ -91,9 +91,7 @@ extern bool loongarch_frag_align_code (int, int);
 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC)	\
   (LARCH_opts.relax ?  \
     (GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC)	\
-      || ((SEC)->flags & SEC_CODE) != 0		\
-      || ((SEC)->flags & SEC_DEBUGGING) != 0	\
-      || TC_FORCE_RELOCATION (FIX)) \
+      || ((SEC)->flags & SEC_CODE) != 0)		\
     : (GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC))) \
 
 #define TC_LINKRELAX_FIXUP(seg) ((seg->flags & SEC_CODE)  \
diff --git a/gas/testsuite/gas/loongarch/relax_debug_line.d b/gas/testsuite/gas/loongarch/relax_debug_line.d
new file mode 100644
index 00000000000..c17813c20ed
--- /dev/null
+++ b/gas/testsuite/gas/loongarch/relax_debug_line.d
@@ -0,0 +1,12 @@
+#as: --gdwarf-5
+#readelf: -r --wide
+#skip: loongarch32-*-*
+
+Relocation section '\.rela\.debug_line' at offset .* contains 5 entries:
+#...
+0+22.*R_LARCH_32[ \t]+[0-9]+.*
+0+2c.*R_LARCH_32[ \t]+[0-9]+.*
+0+36.*R_LARCH_64[ \t]+[0-9]+.*
+0+42.*R_LARCH_ADD16[ \t]+[0-9]+.*
+0+42.*R_LARCH_SUB16[ \t]+[0-9]+.*
+#pass
diff --git a/gas/testsuite/gas/loongarch/relax_debug_line.s b/gas/testsuite/gas/loongarch/relax_debug_line.s
new file mode 100644
index 00000000000..d2852bb91e2
--- /dev/null
+++ b/gas/testsuite/gas/loongarch/relax_debug_line.s
@@ -0,0 +1,6 @@
+  .file 0 "test"
+  .text
+  .loc 0 10 0
+  nop
+
+.section .debug_line, "", @progbits
-- 
2.43.0