On Wed, Jan 27, 2016 at 06:34:41PM +0300, Ilya Enkovich wrote:
> @@ -5453,6 +5443,11 @@ ix86_option_override_internal (bool main_args_p,
> opts->x_target_flags |= MASK_VZEROUPPER;
> if (!(opts_set->x_target_flags & MASK_STV))
> opts->x_target_flags |= MASK_STV;
> + /* Disable STV if -mpreferred-stack-boundary={2,3} - the needed
The comment doesn't match the code, you disable STV only for
-mpreferred-stack-boundary=2.
> + stack realignment will be extra cost the pass doesn't take into
> + account and the pass can't realign the stack. */
> + if (ix86_preferred_stack_boundary < 64)
> + opts->x_target_flags &= ~MASK_STV;
> if (!ix86_tune_features[X86_TUNE_AVX256_UNALIGNED_LOAD_OPTIMAL]
> && !(opts_set->x_target_flags & MASK_AVX256_SPLIT_UNALIGNED_LOAD))
> opts->x_target_flags |= MASK_AVX256_SPLIT_UNALIGNED_LOAD;
Jakub
