LoongArch: Check whether binutils supports the relax function. If supported, explicit...

gcc/ChangeLog:

	* config.in: Regenerate.
	* config/loongarch/genopts/loongarch.opt.in: Add compilation option
	mrelax. And set the initial value of explicit-relocs according to the
	detection status.
	* config/loongarch/gnu-user.h: When compiling with -mno-relax, pass the
	--no-relax option to the linker.
	* config/loongarch/loongarch-driver.h (ASM_SPEC): When compiling with
	-mno-relax, pass the -mno-relax option to the assembler.
	* config/loongarch/loongarch-opts.h (HAVE_AS_MRELAX_OPTION): Define macro.
	* config/loongarch/loongarch.opt: Regenerate.
	* configure: Regenerate.
	* configure.ac: Add detection of support for binutils relax function.

diff --git a/gcc/config.in b/gcc/config.in
index f0071456f03c574d0e33af2607a0f12552c5389f..d04718ad12822cfd573ffd1e5eebbcdb3fdd5656 100644 (file)
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -634,6 +634,12 @@
 #endif
 
 
+/* Define if your assembler supports -mrelax option. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_MRELAX_OPTION
+#endif
+
+
 /* Define if your assembler supports .mspabi_attribute. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_MSPABI_ATTRIBUTE

diff --git a/gcc/config/loongarch/genopts/loongarch.opt.in b/gcc/config/loongarch/genopts/loongarch.opt.in
index 78a27dac806c341967ff00b641244cd4b61a3c7c..9f98f2d845a61e0bb3632901bebaa3d2cb1a0258 100644 (file)
--- a/gcc/config/loongarch/genopts/loongarch.opt.in
+++ b/gcc/config/loongarch/genopts/loongarch.opt.in
@@ -175,7 +175,7 @@ Target Joined RejectNegative UInteger Var(loongarch_max_inline_memcpy_size) Init
 -mmax-inline-memcpy-size=SIZE  Set the max size of memcpy to inline, default is 1024.
 
 mexplicit-relocs
-Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS)
+Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS & !HAVE_AS_MRELAX_OPTION)
 Use %reloc() assembly operators.
 
 ; The code model option names for -mcmodel.
@@ -208,3 +208,8 @@ Specify the code model.
 mdirect-extern-access
 Target Var(TARGET_DIRECT_EXTERN_ACCESS) Init(0)
 Avoid using the GOT to access external symbols.
+
+mrelax
+Target Var(loongarch_mrelax) Init(HAVE_AS_MRELAX_OPTION)
+Take advantage of linker relaxations to reduce the number of instructions
+required to materialize symbol addresses.

diff --git a/gcc/config/loongarch/gnu-user.h b/gcc/config/loongarch/gnu-user.h
index fa1a5211419c0b7f1818705f8da59e43b525576b..9616d6e8a0b8629720a844fd0122dafef682a4cb 100644 (file)
--- a/gcc/config/loongarch/gnu-user.h
+++ b/gcc/config/loongarch/gnu-user.h
@@ -48,7 +48,8 @@ along with GCC; see the file COPYING3.  If not see
   "%{!shared: %{static} " \
   "%{!static: %{!static-pie: %{rdynamic:-export-dynamic} " \
   "-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}} " \
-  "%{static-pie: -static -pie --no-dynamic-linker -z text}}"
+  "%{static-pie: -static -pie --no-dynamic-linker -z text}}" \
+  "%{mno-relax: --no-relax}"
 
 
 /* Similar to standard Linux, but adding -ffast-math support.  */

diff --git a/gcc/config/loongarch/loongarch-driver.h b/gcc/config/loongarch/loongarch-driver.h
index d917fcabd37948be68290688b82db53195c896d0..d859afcc9fee737fa23daf10dfcb7c8fe0ef9a4e 100644 (file)
--- a/gcc/config/loongarch/loongarch-driver.h
+++ b/gcc/config/loongarch/loongarch-driver.h
@@ -53,7 +53,7 @@ along with GCC; see the file COPYING3.  If not see
 
 #undef ASM_SPEC
 #define ASM_SPEC \
-  "%{mabi=*} %(subtarget_asm_spec)"
+  "%{mabi=*} %{mno-relax} %(subtarget_asm_spec)"
 
 
 extern const char*

diff --git a/gcc/config/loongarch/loongarch-opts.h b/gcc/config/loongarch/loongarch-opts.h
index 3c6ff2e0d44152fdf88ee5665b127003f21554da..2756939b05db1dbfac3d654dbdfcdb31c0e0ba1e 100644 (file)
--- a/gcc/config/loongarch/loongarch-opts.h
+++ b/gcc/config/loongarch/loongarch-opts.h
@@ -97,4 +97,8 @@ loongarch_update_gcc_opt_status (struct loongarch_target *target,
 #define HAVE_AS_EXPLICIT_RELOCS 0
 #endif
 
+#ifndef HAVE_AS_MRELAX_OPTION
+#define HAVE_AS_MRELAX_OPTION 0
+#endif
+
 #endif /* LOONGARCH_OPTS_H */

diff --git a/gcc/config/loongarch/loongarch.opt b/gcc/config/loongarch/loongarch.opt
index b06b58b5ba2ee863ebee7e65c0c3156526b82bd4..e1b085ae87cfe85a723a3277f383229a3e022492 100644 (file)
--- a/gcc/config/loongarch/loongarch.opt
+++ b/gcc/config/loongarch/loongarch.opt
@@ -182,7 +182,7 @@ Target Joined RejectNegative UInteger Var(loongarch_max_inline_memcpy_size) Init
 -mmax-inline-memcpy-size=SIZE  Set the max size of memcpy to inline, default is 1024.
 
 mexplicit-relocs
-Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS)
+Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS & !HAVE_AS_MRELAX_OPTION)
 Use %reloc() assembly operators.
 
 ; The code model option names for -mcmodel.
@@ -215,3 +215,8 @@ Specify the code model.
 mdirect-extern-access
 Target Var(TARGET_DIRECT_EXTERN_ACCESS) Init(0)
 Avoid using the GOT to access external symbols.
+
+mrelax
+Target Var(loongarch_mrelax) Init(HAVE_AS_MRELAX_OPTION)
+Take advantage of linker relaxations to reduce the number of instructions
+required to materialize symbol addresses.

diff --git a/gcc/configure b/gcc/configure
index 1615927354909de236e7398d829a47007ae96b84..0ba7ac07a075c63cb2f5cbfe6db355b0a41685c3 100755 (executable)
--- a/gcc/configure
+++ b/gcc/configure
@@ -29096,6 +29096,37 @@ if test $gcc_cv_as_loongarch_eh_frame_pcrel_encoding_support = yes; then
 
 $as_echo "#define HAVE_AS_EH_FRAME_PCREL_ENCODING_SUPPORT 1" >>confdefs.h
 
+fi
+
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for -mrelax option" >&5
+$as_echo_n "checking assembler for -mrelax option... " >&6; }
+if ${gcc_cv_as_loongarch_relax+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  gcc_cv_as_loongarch_relax=no
+  if test x$gcc_cv_as != x; then
+    $as_echo '.text' > conftest.s
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -mrelax -o conftest.o conftest.s >&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+       gcc_cv_as_loongarch_relax=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_loongarch_relax" >&5
+$as_echo "$gcc_cv_as_loongarch_relax" >&6; }
+if test $gcc_cv_as_loongarch_relax = yes; then
+
+$as_echo "#define HAVE_AS_MRELAX_OPTION 1" >>confdefs.h
+
 fi
 
     ;;

diff --git a/gcc/configure.ac b/gcc/configure.ac
index 8bc9d5e26e068c7682651351bfe6176af5b750d9..8057a0a32a28a08ced852e2cf5e5d8c5cf570842 100644 (file)
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -5370,6 +5370,10 @@ x:
        .cfi_endproc],,
       [AC_DEFINE(HAVE_AS_EH_FRAME_PCREL_ENCODING_SUPPORT, 1,
          [Define if your assembler supports eh_frame pcrel encoding.])])
+    gcc_GAS_CHECK_FEATURE([-mrelax option], gcc_cv_as_loongarch_relax,
+      [-mrelax], [.text],,
+      [AC_DEFINE(HAVE_AS_MRELAX_OPTION, 1,
+               [Define if your assembler supports -mrelax option.])])
     ;;
     s390*-*-*)
     gcc_GAS_CHECK_FEATURE([.gnu_attribute support],