From: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
To: gcc-patches@gcc.gnu.org
Subject: [Patch PR target/67366 1/2] [ARM] - Add movmisalignhi / si patterns
Date: Thu, 08 Oct 2015 14:06:00 -0000 [thread overview]
Message-ID: <fb3f8f7e60c0ad27ae3b26c27005e91b28c2aa2a.1444312704.git.ramana.radhakrishnan@arm.com> (raw)
In-Reply-To: <cover.1444312704.git.ramana.radhakrishnan@arm.com>
This adds movmisalignhi and movmisalignsi expanders when unaligned
access is allowed by the architecture. This allows the mid-end
to expand to misaligned loads and stored.
Compared code generated for the Linux kernel and
it changes code generation for a handful of files all for the better
basically by reducing the stack usage.
Tested by :
1. armhf bootstrap and regression test - no regressions.
2.. arm-none-eabi cross build and regression test for
{-marm/-march=armv7-a/-mfpu=vfpv3-d16/-mfloat-abi=softfp}
{-mthumb/-march=armv8-a/-mfpu=crypto-neon-fp-armv8/-mfloat-abi=hard}
{-marm/-mcpu=arm7tdmi/-mfloat-abi=soft}
{-mthumb/-mcpu=arm7tdmi/-mfloat-abi=soft}
Will apply to trunk once 2/2 is approved.
regards
Ramana
2015-09-15 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
PR target/67366
* config/arm/arm.md (movmisalign<mode>): New.
* config/arm/iterators.md (HSI): New.
---
gcc/config/arm/arm.md | 35 +++++++++++++++++++++++++++++++++++
gcc/config/arm/iterators.md | 3 +++
2 files changed, 38 insertions(+)
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index b4c555b..9a3f7bd 100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -11506,6 +11506,41 @@
}"
)
+;; movmisalign patterns for HImode and SImode.
+(define_expand "movmisalign<mode>"
+ [(match_operand:HSI 0 "general_operand")
+ (match_operand:HSI 1 "general_operand")]
+ "unaligned_access"
+{
+ /* This pattern is not permitted to fail during expansion: if both arguments
+ are non-registers (e.g. memory := constant), force operand 1 into a
+ register. */
+ rtx (* gen_unaligned_load)(rtx, rtx);
+ rtx tmp_dest = operands[0];
+ if (!s_register_operand (operands[0], <MODE>mode)
+ && !s_register_operand (operands[1], <MODE>mode))
+ operands[1] = force_reg (<MODE>mode, operands[1]);
+
+ if (<MODE>mode == HImode)
+ {
+ gen_unaligned_load = gen_unaligned_loadhiu;
+ tmp_dest = gen_reg_rtx (SImode);
+ }
+ else
+ gen_unaligned_load = gen_unaligned_loadsi;
+
+ if (MEM_P (operands[1]))
+ {
+ emit_insn (gen_unaligned_load (tmp_dest, operands[1]));
+ if (<MODE>mode == HImode)
+ emit_move_insn (operands[0], gen_lowpart (HImode, tmp_dest));
+ }
+ else
+ emit_insn (gen_unaligned_store<mode> (operands[0], operands[1]));
+
+ DONE;
+})
+
;; Vector bits common to IWMMXT and Neon
(include "vec-common.md")
;; Load the Intel Wireless Multimedia Extension patterns
diff --git a/gcc/config/arm/iterators.md b/gcc/config/arm/iterators.md
index 47cc1ee..6a54125 100644
--- a/gcc/config/arm/iterators.md
+++ b/gcc/config/arm/iterators.md
@@ -33,6 +33,9 @@
;; A list of integer modes that are up to one word long
(define_mode_iterator QHSI [QI HI SI])
+;; A list of integer modes that are half and one word long
+(define_mode_iterator HSI [HI SI])
+
;; A list of integer modes that are less than a word
(define_mode_iterator NARROW [QI HI])
--
1.9.1
next prev parent reply other threads:[~2015-10-08 14:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-08 14:06 [Patch PR target/67366 0/2] Handle misaligned loads and stores for scalars on STRICT_ALIGNMENT targets Ramana Radhakrishnan
2015-10-08 14:06 ` Ramana Radhakrishnan [this message]
2015-10-08 14:11 ` [Patch PR target/67366 2/2] [gimple-fold.c] Support movmisalign optabs in gimple-fold.c Ramana Radhakrishnan
2015-10-09 9:20 ` Richard Biener
2015-10-14 17:35 ` Jeff Law
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=fb3f8f7e60c0ad27ae3b26c27005e91b28c2aa2a.1444312704.git.ramana.radhakrishnan@arm.com \
--to=ramana.radhakrishnan@arm.com \
--cc=gcc-patches@gcc.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).