From: Bob Plantz <rgplantz@outlook.com>
To: "gcc-help@gcc.gnu.org" <gcc-help@gcc.gnu.org>
Subject: Arm AARCH64 string alignment in .rodata
Date: Sat, 24 Sep 2022 18:24:41 +0000 [thread overview]
Message-ID: <SN6PR04MB46723B9470BF2D38119A70BFD4509@SN6PR04MB4672.namprd04.prod.outlook.com> (raw)
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On 64-bit Raspberry Pi OS, gcc aligns strings in the .rodata section on 64-bit boundaries:
.text
.section .rodata
.align 3
.LC0:
.string "Enter a number: "
.align 3
.LC1:
.string "%i"
.align 3
.LC2:
.string "Result: %i\n"
.text
.align 2
.global main
.type main, %function
main:
I understand the 32-bit boundary for the .text (32-bit instructions), but the element in a string is a byte. Arm documentation says that array addresses should be aligned at the element size. Why align the first character at a 64-bit boundary? Does this have to do with cache alignment?
next reply other threads:[~2022-09-24 18:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-24 18:24 Bob Plantz [this message]
2022-09-24 18:55 ` Xi Ruoyao
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