public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "sebastian.huber@embedded-brains.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/50883] [ARM] Suboptimal optimization for small structures
Date: Fri, 04 Feb 2022 16:29:35 +0000 [thread overview]
Message-ID: <bug-50883-4-JY2gMBnGMd@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-50883-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50883
--- Comment #18 from Sebastian Huber <sebastian.huber@embedded-brains.de> ---
clang 11 produces this code for the attached test case:
clang -O2 -S -o - pr50883.c -target arm
clang-11.0: warning: unknown platform, assuming -mfloat-abi=soft
clang-11.0: warning: unknown platform, assuming -mfloat-abi=soft
.text
.syntax unified
.eabi_attribute 67, "2.09" @ Tag_conformance
.cpu arm7tdmi
.eabi_attribute 6, 2 @ Tag_CPU_arch
.eabi_attribute 8, 1 @ Tag_ARM_ISA_use
.eabi_attribute 9, 1 @ Tag_THUMB_ISA_use
.eabi_attribute 34, 0 @ Tag_CPU_unaligned_access
.eabi_attribute 17, 1 @ Tag_ABI_PCS_GOT_use
.eabi_attribute 20, 1 @ Tag_ABI_FP_denormal
.eabi_attribute 21, 0 @ Tag_ABI_FP_exceptions
.eabi_attribute 23, 3 @ Tag_ABI_FP_number_model
.eabi_attribute 24, 1 @ Tag_ABI_align_needed
.eabi_attribute 25, 1 @ Tag_ABI_align_preserved
.eabi_attribute 38, 1 @ Tag_ABI_FP_16bit_format
.eabi_attribute 18, 4 @ Tag_ABI_PCS_wchar_t
.eabi_attribute 26, 2 @ Tag_ABI_enum_size
.eabi_attribute 14, 0 @ Tag_ABI_PCS_R9_use
.file "pr50883.c"
.globl f @ -- Begin function f
.p2align 2
.type f,%function
.code 32 @ @f
f:
.fnstart
@ %bb.0:
mov r0, r1
bx lr
.Lfunc_end0:
.size f, .Lfunc_end0-f
.cantunwind
.fnend
@ -- End function
.globl g @ -- Begin function g
.p2align 2
.type g,%function
.code 32 @ @g
g:
.fnstart
@ %bb.0:
mov r0, r1
bx lr
.Lfunc_end1:
.size g, .Lfunc_end1-g
.cantunwind
.fnend
@ -- End function
.globl h @ -- Begin function h
.p2align 2
.type h,%function
.code 32 @ @h
h:
.fnstart
@ %bb.0:
ldr r1, .LCPI2_0
ldm r1, {r0, r1}
b j
.p2align 2
@ %bb.1:
.LCPI2_0:
.long ss
.Lfunc_end2:
.size h, .Lfunc_end2-h
.cantunwind
.fnend
@ -- End function
.globl i @ -- Begin function i
.p2align 2
.type i,%function
.code 32 @ @i
i:
.fnstart
@ %bb.0:
ldr r1, .LCPI3_0
ldm r1, {r0, r1}
b k
.p2align 2
@ %bb.1:
.LCPI3_0:
.long tt
.Lfunc_end3:
.size i, .Lfunc_end3-i
.cantunwind
.fnend
@ -- End function
.ident "clang version 11.0.1"
.section ".note.GNU-stack","",%progbits
.addrsig
prev parent reply other threads:[~2022-02-04 16:29 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-27 11:55 [Bug target/50883] New: " sebastian.huber@embedded-brains.de
2011-10-27 11:56 ` [Bug target/50883] " sebastian.huber@embedded-brains.de
2011-10-27 11:58 ` sebastian.huber@embedded-brains.de
2011-10-27 11:58 ` sebastian.huber@embedded-brains.de
2011-10-27 14:51 ` rguenth at gcc dot gnu.org
2011-10-27 15:20 ` sebastian.huber@embedded-brains.de
2011-10-27 16:53 ` rearnsha at gcc dot gnu.org
2022-02-04 0:50 ` pinskia at gcc dot gnu.org
2022-02-04 0:50 ` pinskia at gcc dot gnu.org
2022-02-04 11:05 ` rearnsha at gcc dot gnu.org
2022-02-04 11:11 ` pinskia at gcc dot gnu.org
2022-02-04 11:30 ` rguenth at gcc dot gnu.org
2022-02-04 11:45 ` ebotcazou at gcc dot gnu.org
2022-02-04 11:58 ` rguenther at suse dot de
2022-02-04 12:24 ` ebotcazou at gcc dot gnu.org
2022-02-04 12:27 ` rearnsha at gcc dot gnu.org
2022-02-04 12:29 ` rearnsha at gcc dot gnu.org
2022-02-04 12:55 ` ebotcazou at gcc dot gnu.org
2022-02-04 16:29 ` sebastian.huber@embedded-brains.de [this message]
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=bug-50883-4-JY2gMBnGMd@http.gcc.gnu.org/bugzilla/ \
--to=gcc-bugzilla@gcc.gnu.org \
--cc=gcc-bugs@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).