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This patch checks if assembler supports vector instructions to generate LASX/LSX code or not, and then define HAVE_LOONGARCH_VEC_ASM macro We have added support for vector instructions in binutils-2.41 See: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=75b2f521b101d974354f6ce9ed7c054d8b2e3b7a commit 75b2f521b101d974354f6ce9ed7c054d8b2e3b7a Author: mengqinggang <mengqinggang@loongson.cn> Date: Thu Jun 22 10:35:28 2023 +0800 LoongArch: gas: Add lsx and lasx instructions support gas/ChangeLog: * config/tc-loongarch.c (md_parse_option): Add lsx and lasx option. (loongarch_after_parse_args): Add lsx and lasx option. opcodes/ChangeLog: * loongarch-opc.c (struct loongarch_ase): Add lsx and lasx instructions.
80 lines
2.8 KiB
Plaintext
80 lines
2.8 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/loongarch/elf.
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dnl It is always possible to access static and hidden symbols in an
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dnl position independent way.
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AC_DEFINE(HIDDEN_VAR_NEEDS_DYNAMIC_RELOC)
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dnl Test if the toolchain is new enough for static PIE.
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dnl We need a GAS supporting explicit reloc (older GAS produces stack-based
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dnl reloc and triggers an internal error in the linker). And, we need GCC to
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dnl pass the correct linker flags for static PIE. GCC >= 13 and GAS >= 2.40
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dnl satisfy the requirement, but a distro may backport static PIE support into
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dnl earlier GCC or Binutils releases as well.
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AC_CACHE_CHECK([if the toolchain is sufficient to build static PIE on LoongArch],
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libc_cv_static_pie_on_loongarch, [
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cat > conftest1.S <<\EOF
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.global _start
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.type _start, @function
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_start:
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li.w $a7, 93
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/* This ensures the assembler supports explicit reloc. */
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pcalau12i $a0, %pc_hi20(x)
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ld.w $a0, $a0, %pc_lo12(x)
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syscall 0
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.data
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x:
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.word 0
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/* This should produce an R_LARCH_RELATIVE in the static PIE. */
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.dword _start
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EOF
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cat > conftest2.S <<\EOF
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.global f
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.type f, @function
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f:
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/* The linker should be able to handle this and produce a PLT entry. */
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la.pcrel $t0, $t0, external_func
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jirl $zero, $t0, 0
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EOF
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libc_cv_static_pie_on_loongarch=no
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest1 conftest1.S]) \
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&& AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest1 | grep -q R_LARCH_RELATIVE]) \
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&& ! AC_TRY_COMMAND([LC_ALL=C $READELF -Wl conftest1 | grep -q INTERP]) \
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&& AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -shared -fPIC -o conftest2.so conftest2.S]) \
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&& AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest2.so | grep -q 'R_LARCH_JUMP_SLOT.*external_func'])
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then
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libc_cv_static_pie_on_loongarch=yes
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fi
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rm -rf conftest* ])
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if test "$libc_cv_static_pie_on_loongarch" = yes; then
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AC_DEFINE(SUPPORT_STATIC_PIE)
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fi
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# Check if gcc supports option -mcmodel=medium.
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AC_CACHE_CHECK(whether $CC supports option -mcmodel=medium,
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libc_cv_loongarch_cmodel_medium, [
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if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS -mcmodel=medium /dev/null 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_loongarch_cmodel_medium=yes
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else
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libc_cv_loongarch_cmodel_medium=no
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fi])
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LIBC_CONFIG_VAR([have-cmodel-medium], [$libc_cv_loongarch_cmodel_medium])
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# Check if asm support vector instructions.
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AC_CACHE_CHECK(for vector support in assembler, libc_cv_loongarch_vec_asm, [dnl
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cat > conftest.s <<\EOF
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vld $vr0, $sp, 0
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EOF
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if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_loongarch_vec_asm=yes
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else
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libc_cv_loongarch_vec_asm=no
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fi
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rm -f conftest*])
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if test $libc_cv_loongarch_vec_asm = yes; then
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AC_DEFINE(HAVE_LOONGARCH_VEC_ASM)
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fi
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