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Fix rdtscp detection with --with-lg-vaddr

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The rdtscp probe was nested inside the x86_64 LG_VADDR auto-detection block. Passing --with-lg-vaddr skipped the probe and left JEMALLOC_HAVE_RDTSCP undefined even when the instruction was available.

Keep the probe in the x86_64 branch, but run it independently from LG_VADDR auto-detection.
This commit is contained in:
YANG XIN
2026-06-22 16:57:49 +08:00
committed by Slobodan Predolac
parent 43a8adc187
commit e8a0d2b477
1 changed files with 9 additions and 9 deletions
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18
configure.ac
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@@ -600,9 +600,10 @@ typedef unsigned __int32 uint32_t;
else else
AC_MSG_ERROR([cannot determine number of significant virtual address bits]) AC_MSG_ERROR([cannot determine number of significant virtual address bits])
fi fi
AC_CACHE_CHECK([rdtscp support], fi
[je_cv_rdtscp], AC_CACHE_CHECK([rdtscp support],
AC_RUN_IFELSE([AC_LANG_PROGRAM( [je_cv_rdtscp],
AC_RUN_IFELSE([AC_LANG_PROGRAM(
[[ [[
#include <stdint.h> #include <stdint.h>
]], ]],
@@ -611,12 +612,11 @@ typedef unsigned __int32 uint32_t;
asm volatile("rdtscp" : "=d"(dx) ::); asm volatile("rdtscp" : "=d"(dx) ::);
return 0; return 0;
]])], ]])],
[je_cv_rdtscp=yes], [je_cv_rdtscp=yes],
[je_cv_rdtscp=no], [je_cv_rdtscp=no],
[je_cv_rdtscp=no])) [je_cv_rdtscp=no]))
if test "x${je_cv_rdtscp}" = "xyes"; then if test "x${je_cv_rdtscp}" = "xyes"; then
AC_DEFINE([JEMALLOC_HAVE_RDTSCP], [ ], [ ]) AC_DEFINE([JEMALLOC_HAVE_RDTSCP], [ ], [ ])
fi
fi fi
;; ;;
*) *)