From: Segher Boessenkool <segher@kernel.crashing.org>
To: Richard Henderson <rth@redhat.com>
Cc: gcc-patches@gcc.gnu.org, David Edelsohn <dje.gcc@gmail.com>
Subject: Re: [PATCH 06/15] rs6000: Use rldiwi in constant construction
Date: Wed, 12 Aug 2015 14:02:00 -0000 [thread overview]
Message-ID: <20150812140251.GH4711@gate.crashing.org> (raw)
In-Reply-To: <1439341904-9345-7-git-send-email-rth@redhat.com>
On Tue, Aug 11, 2015 at 06:11:35PM -0700, Richard Henderson wrote:
> @@ -8173,6 +8173,13 @@ genimm_ppc::exam_search (HOST_WIDE_INT c, int budget)
> if (exam_mask (-1, c, sub_budget))
> return true;
>
> + /* If the two halves are equal, use an insert. */
> + if (c >> 32 == test && exam_sub (test, sub_budget))
> + {
> + opN (VEC_DUPLICATE, 0xffffffffu); /* RLDIMI */
> + return true;
> + }
Does this work for c with the high bit set? I think you need
to cast it to unsigned HOST_WIDE_INT first?
Segher
next prev parent reply other threads:[~2015-08-12 14:02 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-12 1:11 [PATCH ppc64,aarch64,alpha 00/15] Improve backend constant generation Richard Henderson
2015-08-12 1:11 ` [PATCH 05/15] rs6000: Move constant via mask into build_set_const_data Richard Henderson
2015-08-12 1:11 ` [PATCH 01/15] rs6000: Split out rs6000_is_valid_and_mask_wide Richard Henderson
2015-08-12 13:24 ` Segher Boessenkool
2015-08-12 15:50 ` Richard Henderson
2015-08-13 2:29 ` Segher Boessenkool
2015-08-12 1:12 ` [PATCH 10/15] rs6000: Use rotldi in constant generation Richard Henderson
2015-08-12 1:12 ` [PATCH 07/15] rs6000: Generalize left shift " Richard Henderson
2015-08-12 1:12 ` [PATCH 14/15] alpha: Split out alpha_cost_set_const Richard Henderson
2015-08-12 1:12 ` [PATCH 03/15] rs6000: Tidy num_insns_constant vs CONST_DOUBLE Richard Henderson
2015-08-12 1:12 ` [PATCH 06/15] rs6000: Use rldiwi in constant construction Richard Henderson
2015-08-12 14:02 ` Segher Boessenkool [this message]
2015-08-12 15:55 ` Richard Henderson
2015-08-13 2:43 ` Segher Boessenkool
2015-08-13 19:01 ` Mike Stump
2015-08-13 20:30 ` Joseph Myers
2015-08-12 1:12 ` [PATCH 11/15] aarch64: Use hashing infrastructure for generating constants Richard Henderson
2015-08-12 1:12 ` [PATCH 08/15] rs6000: Generalize masking in constant generation Richard Henderson
2015-08-12 1:12 ` [PATCH 04/15] rs6000: Implement set_const_data infrastructure Richard Henderson
2015-08-12 13:53 ` Segher Boessenkool
2015-08-12 1:12 ` [PATCH 09/15] rs6000: Use xoris in constant construction Richard Henderson
2015-08-12 1:12 ` [PATCH 02/15] rs6000: Make num_insns_constant_wide static Richard Henderson
2015-08-12 1:12 ` [PATCH 12/15] aarch64: Test for duplicated 32-bit halves Richard Henderson
2015-08-12 1:12 ` [PATCH 15/15] alpha: Remove alpha_emit_set_long_const Richard Henderson
2015-08-12 1:12 ` [PATCH 13/15] alpha: Use hashing infrastructure for generating constants Richard Henderson
2015-08-12 8:32 ` [PATCH ppc64,aarch64,alpha 00/15] Improve backend constant generation Richard Earnshaw
2015-08-12 8:43 ` Richard Earnshaw
2015-08-12 9:02 ` Richard Earnshaw
2015-08-12 15:45 ` Richard Henderson
2015-08-12 8:32 ` Segher Boessenkool
2015-08-12 15:32 ` Richard Henderson
2015-08-13 3:07 ` Segher Boessenkool
2015-08-13 5:36 ` Segher Boessenkool
2015-08-13 3:10 ` Segher Boessenkool
2015-08-13 11:32 ` David Edelsohn
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