diff options
Diffstat (limited to 'sysdeps/x86')
| -rw-r--r-- | sysdeps/x86/atomic-machine.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/x86/atomic-machine.h b/sysdeps/x86/atomic-machine.h index 695222e4fa..2692d94a92 100644 --- a/sysdeps/x86/atomic-machine.h +++ b/sysdeps/x86/atomic-machine.h @@ -60,6 +60,10 @@ typedef uintmax_t uatomic_max_t; # define BR_CONSTRAINT "q" # define IBR_CONSTRAINT "iq" #else +/* Since the Pentium, i386 CPUs have supported 64-bit atomics, but the + i386 psABI supplement provides only 4-byte alignment for uint64_t + inside structs, so it is currently not possible to use 64-bit + atomics on this platform. */ # define __HAVE_64B_ATOMICS 0 # define SP_REG "esp" # define SEG_REG "gs" |