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Extend elf_aux_info() support for RISC-V

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This commit is contained in:
Brad Smith 2024-12-26 07:15:50 -05:00
parent f657ec2213
commit 92b2f37aa8
2 changed files with 7 additions and 3 deletions
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4
configure.ac
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@ -221,9 +221,9 @@ fi
# additional checks for RVV targets
if test x$check_for_rvv = x1; then
AC_MSG_NOTICE([checking how to detect RVV availability])
AC_CHECK_FUNCS([getauxval])
AC_CHECK_FUNCS([getauxval elf_aux_info])
if test $ac_cv_func_getauxval = no; then
if test $ac_cv_func_getauxval = no && test $ac_cv_func_elf_aux_info = no; then
AC_MSG_WARN([RVV is available, but we don't know how to check for it. Will not be able to use RVV.])
fi
fi

6
src/arch/simddetect.cpp
View File

@ -66,7 +66,7 @@
#endif
#if defined(HAVE_RVV)
# if defined(HAVE_GETAUXVAL)
# if defined(HAVE_GETAUXVAL) || defined(HAVE_ELF_AUX_INFO)
# include <sys/auxv.h>
# define HWCAP_RV(letter) (1ul << ((letter) - 'A'))
# endif
@ -244,6 +244,10 @@ SIMDDetect::SIMDDetect() {
# if defined(HAVE_GETAUXVAL)
const unsigned long hwcap = getauxval(AT_HWCAP);
rvv_available_ = hwcap & HWCAP_RV('V');
# elif defined(HAVE_ELF_AUX_INFO)
unsigned long hwcap = 0;
elf_aux_info(AT_HWCAP, &hwcap, sizeof hwcap);
rvv_available_ = hwcap & HWCAP_RV('V');
# endif
#endif