On Tue, Jul 07, 2015 at 01:52:29PM +0100, Jiong Wang wrote:
>
> A second patch to improve rtl loop iv on AArch64.
>
> We should define this to tell gcc the pattern hidden by these GOT unspec
> is safe from trap, so gcc could make more positive decision when
> handling them, for example in RTL loop iv pass, when deciding whether
> one instruction is invariant candidate, may_trap_or_fault_p will be
> invoked which will call this target hook.
>
> OK for trunk?
>
> 2015-07-07 Jiong Wang <jiong.w...@arm.com>
>
> gcc/
> * config/aarch64/aarch64.c (aarch64_unspec_may_trap_p): New function.
> (TARGET_UNSPEC_MAY_TRAP_P): Define as aarch64_unspec_may_trap_p.
OK.
Thanks,
James
>
> --
> Regards,
> Jiong
>
> diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
> index e180daa..c7c12ee 100644
> --- a/gcc/config/aarch64/aarch64.c
> +++ b/gcc/config/aarch64/aarch64.c
> @@ -11943,6 +11943,24 @@ aarch64_use_pseudo_pic_reg (void)
> return aarch64_cmodel == AARCH64_CMODEL_SMALL_SPIC;
> }
>
> +/* Implement TARGET_UNSPEC_MAY_TRAP_P. */
> +
> +static int
> +aarch64_unspec_may_trap_p (const_rtx x, unsigned flags)
> +{
> + switch (XINT (x, 1))
> + {
> + case UNSPEC_GOTSMALLPIC:
> + case UNSPEC_GOTSMALLPIC28K:
> + case UNSPEC_GOTTINYPIC:
> + return 0;
> + default:
> + break;
> + }
> +
> + return default_unspec_may_trap_p (x, flags);
> +}
> +
> #undef TARGET_ADDRESS_COST
> #define TARGET_ADDRESS_COST aarch64_address_cost
>
> @@ -12221,6 +12239,9 @@ aarch64_use_pseudo_pic_reg (void)
> #undef TARGET_SCHED_FUSION_PRIORITY
> #define TARGET_SCHED_FUSION_PRIORITY aarch64_sched_fusion_priority
>
> +#undef TARGET_UNSPEC_MAY_TRAP_P
> +#define TARGET_UNSPEC_MAY_TRAP_P aarch64_unspec_may_trap_p
> +
> #undef TARGET_USE_PSEUDO_PIC_REG
> #define TARGET_USE_PSEUDO_PIC_REG aarch64_use_pseudo_pic_reg
>
