The following proposed patch disables setting, saving and restoring
the VRSAVE register on all targets except Darwin.
VRSAVE was removed from the AIX ABI and was suppose to have been
removed from the PPC SVR4 ABI. All recent versions of the Linux
kernel set and maintain VRSAVE itself, as a process-level flag, not as
individual bits, so no need for the compiler to set the register or to
save and restore it across calls. All uses of VRSAVE (e.g., GLibc)
will continue to work using the value set by the kernel.
Comments?
- David
* config/rs6000/rs6000.c (rs6000_option_override_internal): Do not
set TARGET_ALTIVEC_VRSAVE for TARGET_ELF.
(rs6000_stack_info): Only set vrsave_mask for Darwin.
Index: rs6000.c
===================================================================
*** rs6000.c (revision 191810)
--- rs6000.c (working copy)
*************** rs6000_option_override_internal (bool gl
*** 2725,2734 ****
else
rs6000_altivec_abi = 1;
}
-
- /* Enable VRSAVE for AltiVec ABI, unless explicitly overridden. */
- if (!global_options_set.x_TARGET_ALTIVEC_VRSAVE)
- TARGET_ALTIVEC_VRSAVE = rs6000_altivec_abi;
}
/* Set the Darwin64 ABI as default for 64-bit Darwin.
--- 2725,2730 ----
*************** rs6000_stack_info (void)
*** 17842,17848 ****
else
info_ptr->spe_gp_size = 0;
! if (TARGET_ALTIVEC_ABI)
info_ptr->vrsave_mask = compute_vrsave_mask ();
else
info_ptr->vrsave_mask = 0;
--- 17838,17845 ----
else
info_ptr->spe_gp_size = 0;
! /* Only set VRSAVE register on Darwin. */
! if (DEFAULT_ABI == ABI_DARWIN)
info_ptr->vrsave_mask = compute_vrsave_mask ();
else
info_ptr->vrsave_mask = 0;
