On Thu, Aug 23, 2018 at 2:05 PM Segher Boessenkool
<seg...@kernel.crashing.org> wrote:
>
> The new code testing which way a comparison is best expressed creates
> a pseudoregister (by hand) and creates some insns with that. Such
> insns will no longer recog() when pseudo-registers are no longer
> aloowed (after reload). But we have an ifcvt pass after reload (ce3).
>
> This patch simply returns if we cannot create pseudos.
>
> Tested on powerpc64-linux {-m32,-m64}. Is this okay for trunk?
OK.
>
> Segher
>
>
> 2018-08-23 Segher Boessenkool <seg...@kernel.crashing.org>
>
> PR rtl-optimization/87026
> * expmed.c (canonicalize_comparison): If we can no longer create
> pseudoregisters, don't.
>
> ---
> gcc/expmed.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/gcc/expmed.c b/gcc/expmed.c
> index e281930..0922029 100644
> --- a/gcc/expmed.c
> +++ b/gcc/expmed.c
> @@ -6243,6 +6243,10 @@ canonicalize_comparison (machine_mode mode, enum
> rtx_code *code, rtx *imm)
> if (overflow)
> return;
>
> + /* The following creates a pseudo; if we cannot do that, bail out. */
> + if (!can_create_pseudo_p ())
> + return;
> +
> rtx reg = gen_rtx_REG (mode, LAST_VIRTUAL_REGISTER + 1);
> rtx new_imm = immed_wide_int_const (imm_modif, mode);
>
> --
> 1.8.3.1
>
