From: Richard Henderson <rth@redhat.com>
To: gcc-patches@gcc.gnu.org
Cc: Marcus Shawcroft <marcus.shawcroft@arm.com>,
Richard Earnshaw <richard.earnshaw@arm.com>
Subject: [PATCH 12/15] aarch64: Test for duplicated 32-bit halves
Date: Wed, 12 Aug 2015 01:12:00 -0000 [thread overview]
Message-ID: <1439341904-9345-13-git-send-email-rth@redhat.com> (raw)
In-Reply-To: <1439341904-9345-1-git-send-email-rth@redhat.com>
Cc: Marcus Shawcroft <marcus.shawcroft@arm.com>
Cc: Richard Earnshaw <richard.earnshaw@arm.com>
---
* config/aarch64/aarch64.c (AA_GI_DUP): New.
(genimm_aa64::exam_full): Test for equal 32-bit parts.
(genimm_aa64::generate): Handle AA_GI_DUP.
---
gcc/config/aarch64/aarch64.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 6b12a07..828526e 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -1328,6 +1328,7 @@ STATIC_ASSERT (((int)AND & ~48) != 0);
enum aa_gi_code
{
+ AA_GI_DUP = -3,
AA_GI_NIL = -2,
AA_GI_SET = -1,
@@ -1565,6 +1566,17 @@ genimm_aa64::exam_full (unsigned HOST_WIDE_INT val)
return;
}
+ /* If the two halves of the constant are the same, use an insert.
+ Since we have already excluded one_match and zero_match == 2,
+ this must require three insns to generate. */
+ if ((val >> 32) == (val & 0xffffffffu))
+ {
+ set0 (val & 0xffff);
+ insN (16, val);
+ opN (AA_GI_DUP, 32);
+ return;
+ }
+
simple_sequence:
cost = 0;
for (int i = 0; i < 64; i += 16)
@@ -1629,6 +1641,11 @@ genimm_aa64::generate (rtx dest, machine_mode mode) const
else
x = gen_insv_immdi (dest, GEN_INT ((int)code[i]), x);
break;
+ case AA_GI_DUP:
+ x = gen_rtx_ASHIFT (mode, dest, x);
+ x = gen_rtx_IOR (mode, x, dest);
+ x = gen_rtx_SET (dest, x);
+ break;
default:
gcc_unreachable ();
}
--
2.4.3
next prev parent reply other threads:[~2015-08-12 1:12 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 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 1:11 ` [PATCH 05/15] rs6000: Move constant via mask into build_set_const_data 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 08/15] rs6000: Generalize masking in constant generation Richard Henderson
2015-08-12 1:12 ` [PATCH 11/15] aarch64: Use hashing infrastructure for generating constants 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
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 10/15] rs6000: Use rotldi in constant generation 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 07/15] rs6000: Generalize left shift in constant generation Richard Henderson
2015-08-12 1:12 ` [PATCH 13/15] alpha: Use hashing infrastructure for generating constants Richard Henderson
2015-08-12 1:12 ` [PATCH 15/15] alpha: Remove alpha_emit_set_long_const Richard Henderson
2015-08-12 1:12 ` Richard Henderson [this message]
2015-08-12 1:12 ` [PATCH 02/15] rs6000: Make num_insns_constant_wide static 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 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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