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configure.in: Check whether gas supports -relax.

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* configure.in: Check whether gas supports -relax.
	* configure, config.in: Rebuilt.
	* config/sparc/sparc.h (ASM_RELAX_SPEC): Define.
	(EXTRA_SPECS): Add asm_relax.
	(ASM_SPEC): Add %(asm_relax).
	(TARGET_SWITCHES): Add -mrelax and -mno-relax.
	* config/sparc/linux64.h (LINK_ARCH_SPEC): Rename to LINK_SPEC.
	(LINK_SPEC): Pass -relax to linker unless -mno-relax or -r.
	(ASM_SPEC): Add %(asm_relax).
	* config/sparc/linux.h (LINK_SPEC, ASM_SPEC): Likewise.
	* config/sparc/sparc.c (output_sibcall): If HAVE_AS_RELAX_OPTION,
	never use sethi/jmpl for leaf tail calls.  Use or with rs2 %g0
	instead of mov, so that gas can further optimize it.

From-SVN: r34466
This commit is contained in:
Jakub Jelinek 2000-06-09 16:31:54 +02:00 committed by Jakub Jelinek
parent dba1acea53
commit e95b1e6a2e
8 changed files with 100 additions and 13 deletions
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16
gcc/ChangeLog
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@ -1,3 +1,19 @@
2000-06-09 Jakub Jelinek <jakub@redhat.com>
* configure.in: Check whether gas supports -relax.
* configure, config.in: Rebuilt.
* config/sparc/sparc.h (ASM_RELAX_SPEC): Define.
(EXTRA_SPECS): Add asm_relax.
(ASM_SPEC): Add %(asm_relax).
(TARGET_SWITCHES): Add -mrelax and -mno-relax.
* config/sparc/linux64.h (LINK_ARCH_SPEC): Rename to LINK_SPEC.
(LINK_SPEC): Pass -relax to linker unless -mno-relax or -r.
(ASM_SPEC): Add %(asm_relax).
* config/sparc/linux.h (LINK_SPEC, ASM_SPEC): Likewise.
* config/sparc/sparc.c (output_sibcall): If HAVE_AS_RELAX_OPTION,
never use sethi/jmpl for leaf tail calls. Use or with rs2 %g0
instead of mov, so that gas can further optimize it.
2000-06-08 James E. Wilson <wilson@bletchleypark.cygnus.com>
* dwarf2out.c (size_of_die, case dw_val_class_const): Use

3
gcc/config.in
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@ -426,6 +426,9 @@
/* Define if your assembler supports .register. */
#undef HAVE_AS_REGISTER_PSEUDO_OP
/* Define if your assembler supports -relax option. */
#undef HAVE_AS_RELAX_OPTION
/* Define if the assembler supports 64bit sparc. */
#undef AS_SPARC64_FLAG

4
gcc/config/sparc/linux.h
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@ -179,6 +179,7 @@ Boston, MA 02111-1307, USA. */
#endif
#else
#define LINK_SPEC "-m elf32_sparc -Y P,/usr/lib %{shared:-shared} \
%{!mno-relax:%{!r:-relax}} \
%{!shared: \
%{!ibcs: \
%{!static: \
@ -191,7 +192,8 @@ Boston, MA 02111-1307, USA. */
It's safe to pass -s always, even if -g is not used. */
#undef ASM_SPEC
#define ASM_SPEC \
"%{V} %{v:%{!V:-V}} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Wa,*:%*} -s %{fpic:-K PIC} %{fPIC:-K PIC}"
"%{V} %{v:%{!V:-V}} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Wa,*:%*} -s %{fpic:-K PIC} \
%{fPIC:-K PIC} %(asm_relax)"
/* Same as sparc.h */
#undef DBX_REGISTER_NUMBER

7
gcc/config/sparc/linux64.h
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@ -246,6 +246,7 @@ Boston, MA 02111-1307, USA. */
#define LINK_SPEC "\
%(link_arch) \
%{mlittle-endian:-EL} \
%{!mno-relax:%{!r:-relax}} \
"
#undef CC1_SPEC
@ -283,7 +284,7 @@ Boston, MA 02111-1307, USA. */
#else /* !SPARC_BI_ARCH */
#undef LINK_SPEC
#define LINK_ARCH_SPEC "-m elf64_sparc -Y P,/usr/lib64 %{shared:-shared} \
#define LINK_SPEC "-m elf64_sparc -Y P,/usr/lib64 %{shared:-shared} \
%{!shared: \
%{!ibcs: \
%{!static: \
@ -291,6 +292,7 @@ Boston, MA 02111-1307, USA. */
%{!dynamic-linker:-dynamic-linker /lib64/ld-linux.so.2}} \
%{static:-static}}} \
%{mlittle-endian:-EL} \
%{!mno-relax:%{!r:-relax}} \
"
#endif /* !SPARC_BI_ARCH */
@ -308,8 +310,7 @@ Boston, MA 02111-1307, USA. */
%{Wa,*:%*} \
-s %{fpic:-K PIC} %{fPIC:-K PIC} \
%{mlittle-endian:-EL} \
%(asm_cpu) %(asm_arch) \
"
%(asm_cpu) %(asm_arch) %(asm_relax)"
/* Same as sparc.h */
#undef DBX_REGISTER_NUMBER

14
gcc/config/sparc/sparc.c
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@ -3737,7 +3737,15 @@ output_sibcall (insn, call_operand)
if (leaf_regs)
{
#ifdef HAVE_AS_RELAX_OPTION
/* If as and ld are relaxing tail call insns into branch always,
use or %o7,%g0,X; call Y; or X,%g0,%o7 always, so that it can
be optimized. With sethi/jmpl as nor ld has no easy way how to
find out if somebody does not branch between the sethi and jmpl. */
int spare_slot = 0;
#else
int spare_slot = ((TARGET_ARCH32 || TARGET_CM_MEDLOW) && ! flag_pic);
#endif
int size = 0;
if ((actual_fsize || ! spare_slot) && delay_slot)
@ -3786,9 +3794,11 @@ output_sibcall (insn, call_operand)
{
if (size)
fprintf (asm_out_file, "\tsub\t%%sp, -%d, %%sp\n", size);
output_asm_insn ("mov\t%%o7, %%g1", operands);
/* Use or with rs2 %%g0 instead of mov, so that as/ld can optimize
it into branch if possible. */
output_asm_insn ("or\t%%o7, %%g0, %%g1", operands);
output_asm_insn ("call\t%a0, 0", operands);
output_asm_insn (" mov\t%%g1, %%o7", operands);
output_asm_insn (" or\t%%g1, %%g0, %%o7", operands);
}
return "";
}

12
gcc/config/sparc/sparc.h
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@ -324,12 +324,17 @@ Unrecognized value in TARGET_CPU_DEFAULT.
%{!m32:%{!m64:%(asm_arch_default)}} \
"
#ifdef HAVE_AS_RELAX_OPTION
#define ASM_RELAX_SPEC "%{!mno-relax:-relax}"
#else
#define ASM_RELAX_SPEC ""
#endif
/* Special flags to the Sun-4 assembler when using pipe for input. */
#define ASM_SPEC "\
%| %{R} %{!pg:%{!p:%{fpic:-k} %{fPIC:-k}}} %{keep-local-as-symbols:-L} \
%(asm_cpu) \
"
%(asm_cpu) %(asm_relax)"
#define LIB_SPEC "%{!shared:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} %{g:-lg}}"
@ -362,6 +367,7 @@ Unrecognized value in TARGET_CPU_DEFAULT.
{ "asm_cpu_default", ASM_CPU_DEFAULT_SPEC }, \
{ "asm_arch32", ASM_ARCH32_SPEC }, \
{ "asm_arch64", ASM_ARCH64_SPEC }, \
{ "asm_relax", ASM_RELAX_SPEC }, \
{ "asm_arch_default", ASM_ARCH_DEFAULT_SPEC },\
{ "asm_arch", ASM_ARCH_SPEC }, \
SUBTARGET_EXTRA_SPECS
@ -606,6 +612,8 @@ extern int target_flags;
{"no-stack-bias", -MASK_STACK_BIAS, "Do not use stack bias" }, \
{"faster-structs", MASK_FASTER_STRUCTS, "Use structs on stronger alignment for double-word copies" }, \
{"no-faster-structs", -MASK_FASTER_STRUCTS, "Do not use structs on stronger alignment for double-word copies" }, \
{"relax", 0, "Optimize tail call instructions in assembler and linker" }, \
{"no-relax", 0, "Do not optimize tail call instructions in assembler or linker" }, \
SUBTARGET_SWITCHES \
{ "", TARGET_DEFAULT, ""}}

38
gcc/configure vendored
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@ -8916,10 +8916,38 @@ EOF
fi
echo $ac_n "checking assembler supports -relax""... $ac_c" 1>&6
echo "configure:8921: checking assembler supports -relax" >&5
if eval "test \"`echo '$''{'gcc_cv_as_relax_opt'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
gcc_cv_as_relax_opt=unknown
if test x$gcc_cv_as != x; then
# Check if gas supports -relax
echo ".text" > conftest.s
if $gcc_cv_as -relax -o conftest.o conftest.s > /dev/null 2>&1; then
gcc_cv_as_relax_opt=yes
else
gcc_cv_as_relax_opt=no
fi
rm -f conftest.s conftest.o
fi
fi
echo "$ac_t""$gcc_cv_as_relax_opt" 1>&6
if test "x$gcc_cv_as_relax_opt" = xyes; then
cat >> confdefs.h <<\EOF
#define HAVE_AS_RELAX_OPTION 1
EOF
fi
case "$tm_file" in
*64*)
echo $ac_n "checking for 64 bit support in assembler ($gcc_cv_as)""... $ac_c" 1>&6
echo "configure:8923: checking for 64 bit support in assembler ($gcc_cv_as)" >&5
echo "configure:8951: checking for 64 bit support in assembler ($gcc_cv_as)" >&5
if eval "test \"`echo '$''{'gcc_cv_as_flags64'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -8964,7 +8992,7 @@ EOF
if test "x$gcc_cv_as_flags64" != xno; then
echo $ac_n "checking for assembler offsetable %lo() support""... $ac_c" 1>&6
echo "configure:8968: checking for assembler offsetable %lo() support" >&5
echo "configure:8996: checking for assembler offsetable %lo() support" >&5
if eval "test \"`echo '$''{'gcc_cv_as_offsetable_lo10'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -9003,7 +9031,7 @@ EOF
i[34567]86-*-*)
echo $ac_n "checking assembler instructions""... $ac_c" 1>&6
echo "configure:9007: checking assembler instructions" >&5
echo "configure:9035: checking assembler instructions" >&5
gcc_cv_as_instructions=
if test x$gcc_cv_as != x; then
set "filds fists" "filds mem; fists mem"
@ -9133,7 +9161,7 @@ fi
# Build a new-libstdc++ system (ie libstdc++-v3)
echo $ac_n "checking for libstdc++ to install""... $ac_c" 1>&6
echo "configure:9137: checking for libstdc++ to install" >&5
echo "configure:9165: checking for libstdc++ to install" >&5
# Check whether --enable-libstdcxx-v3 or --disable-libstdcxx-v3 was given.
if test "${enable_libstdcxx_v3+set}" = set; then
enableval="$enable_libstdcxx_v3"
@ -9157,7 +9185,7 @@ EOF
echo $ac_n "checking whether to enable maintainer-specific portions of Makefiles""... $ac_c" 1>&6
echo "configure:9161: checking whether to enable maintainer-specific portions of Makefiles" >&5
echo "configure:9189: checking whether to enable maintainer-specific portions of Makefiles" >&5
# Check whether --enable-maintainer-mode or --disable-maintainer-mode was given.
if test "${enable_maintainer_mode+set}" = set; then
enableval="$enable_maintainer_mode"

19
gcc/configure.in
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@ -4550,6 +4550,25 @@ case "$target" in
[Define if your assembler supports .register.])
fi
AC_CACHE_CHECK([assembler supports -relax],
gcc_cv_as_relax_opt, [
gcc_cv_as_relax_opt=unknown
if test x$gcc_cv_as != x; then
# Check if gas supports -relax
echo ".text" > conftest.s
if $gcc_cv_as -relax -o conftest.o conftest.s > /dev/null 2>&1; then
gcc_cv_as_relax_opt=yes
else
gcc_cv_as_relax_opt=no
fi
rm -f conftest.s conftest.o
fi
])
if test "x$gcc_cv_as_relax_opt" = xyes; then
AC_DEFINE(HAVE_AS_RELAX_OPTION, 1,
[Define if your assembler supports -relax option.])
fi
case "$tm_file" in
*64*)
AC_CACHE_CHECK([for 64 bit support in assembler ($gcc_cv_as)],