On Wed, 2014-12-10 at 12:59 +0000, Renlin Li wrote:
> Hi all,
>
> This patch update the CTZ_DEFINED_VALUE_AT_ZERO definition to support
> more modes. In addition, those two macros should both return 2 in
> aarch64 back-end.
>
> Here are the explanations from GCC documentation:
>
> CLZ_DEFINED_VALUE_AT_ZERO (mode, value)
> CTZ_DEFINED_VALUE_AT_ZERO (mode, value)
> A C expression that indicates whether the architecture defines a value
> for @code{clz} or @code{ctz} with a zero operand.
> A result of 0 indicates the value is undefined.
> If the value is defined for only the RTL expression, the macro should
> evaluate to 1; if the value applies also to the corresponding optab
> entry (which is normally the case if it expands directly into
> the corresponding RTL), then the macro should evaluate to 2.
> In the cases where the value is defined, @var{value} should be set to
> this value.
>
>
> aarch64-none-elf has been test on the model, no new issue.
> Okay for trunk?
>
> Regards,
> Renlin Li
>
> gcc/ChangeLog:
>
> 2014-12-10 Renlin Li <renlin...@arm.com>
>
> * config/aarch64/aarch64.h (CLZ_DEFINED_VALUE_AT_ZERO): make it
> return 2.
> (CTZ_DEFINED_VALUE_AT_ZERO): Update to support more modes.
OK.
R.
