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7e681561a3
When compiled with -O3 and AVX, GCC 8 and 9 optimize some loops in sysdeps/ieee754/dbl-64/branred.c with 256-bit vector instructions, which leads to store forward stall: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90579 There is no easy fix in compiler. This patch limits vector width to 128 bits to work around this issue. It improves performance of sin and cos by more than 40% on Skylake compiled with -O3 -march=skylake. Tested with GCC 7/8/9 on x86-64. [BZ #24603] * sysdeps/x86_64/configure.ac: Check if -mprefer-vector-width=128 works. * sysdeps/x86_64/configure: Regenerated. * sysdeps/x86_64/fpu/Makefile (CFLAGS-branred.c): New. Set to -mprefer-vector-width=128 if supported.
148 lines
4.6 KiB
Plaintext
148 lines
4.6 KiB
Plaintext
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
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# Local configure fragment for sysdeps/x86_64.
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for AVX512DQ support in assembler" >&5
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$as_echo_n "checking for AVX512DQ support in assembler... " >&6; }
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if ${libc_cv_asm_avx512dq+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat > conftest.s <<\EOF
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vandpd (%rax), %zmm6, %zmm1
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EOF
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if { ac_try='${CC-cc} -c $ASFLAGS conftest.s 1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then
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libc_cv_asm_avx512dq=yes
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else
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libc_cv_asm_avx512dq=no
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fi
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rm -f conftest*
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_avx512dq" >&5
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$as_echo "$libc_cv_asm_avx512dq" >&6; }
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if test $libc_cv_asm_avx512dq = yes; then
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$as_echo "#define HAVE_AVX512DQ_ASM_SUPPORT 1" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for AVX512 support" >&5
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$as_echo_n "checking for AVX512 support... " >&6; }
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if ${libc_cv_cc_avx512+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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if { ac_try='${CC-cc} -mavx512f -xc /dev/null -S -o /dev/null'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then :
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libc_cv_cc_avx512=$libc_cv_asm_avx512dq
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else
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libc_cv_cc_avx512=no
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fi
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_avx512" >&5
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$as_echo "$libc_cv_cc_avx512" >&6; }
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if test $libc_cv_cc_avx512 = yes; then
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$as_echo "#define HAVE_AVX512_SUPPORT 1" >>confdefs.h
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fi
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config_vars="$config_vars
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config-cflags-avx512 = $libc_cv_cc_avx512"
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking -mprefer-vector-width=128" >&5
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$as_echo_n "checking -mprefer-vector-width=128... " >&6; }
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if ${libc_cv_cc_mprefer_vector_width+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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if { ac_try='${CC-cc} -mprefer-vector-width=128 -xc /dev/null -S -o /dev/null'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then :
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libc_cv_cc_mprefer_vector_width=yes
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else
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libc_cv_cc_mprefer_vector_width=no
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fi
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_mprefer_vector_width" >&5
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$as_echo "$libc_cv_cc_mprefer_vector_width" >&6; }
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config_vars="$config_vars
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config-cflags-mprefer-vector-width = $libc_cv_cc_mprefer_vector_width"
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Intel MPX support" >&5
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$as_echo_n "checking for Intel MPX support... " >&6; }
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if ${libc_cv_asm_mpx+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat > conftest.s <<\EOF
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bndmov %bnd0,(%rsp)
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EOF
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if { ac_try='${CC-cc} -c $ASFLAGS conftest.s 1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then
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libc_cv_asm_mpx=yes
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else
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libc_cv_asm_mpx=no
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fi
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rm -f conftest*
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_mpx" >&5
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$as_echo "$libc_cv_asm_mpx" >&6; }
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if test $libc_cv_asm_mpx = yes; then
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$as_echo "#define HAVE_MPX_SUPPORT 1" >>confdefs.h
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fi
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if test x"$build_mathvec" = xnotset; then
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build_mathvec=yes
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fi
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if test "$static_pie" = yes; then
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker static PIE support" >&5
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$as_echo_n "checking for linker static PIE support... " >&6; }
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if ${libc_cv_ld_static_pie+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat > conftest.s <<\EOF
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.text
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.global _start
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.weak foo
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_start:
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leaq foo(%rip), %rax
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EOF
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libc_cv_pie_option="-Wl,-pie"
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if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp $libc_cv_pie_option -o conftest conftest.s 1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then
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libc_cv_ld_static_pie=yes
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else
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libc_cv_ld_static_pie=no
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fi
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rm -f conftest*
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ld_static_pie" >&5
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$as_echo "$libc_cv_ld_static_pie" >&6; }
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if test "$libc_cv_ld_static_pie" != yes; then
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as_fn_error $? "linker support for static PIE needed" "$LINENO" 5
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fi
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fi
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$as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h
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test -n "$critic_missing" && as_fn_error $? "
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*** $critic_missing" "$LINENO" 5
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