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2020 Jun 01
3
Aarch64: unaligned access despite -mstrict-align
Hi,
I experienced a crash in code compiled with Clang 10.0.0 due to a
misaligned 64-bit data access. The (ARMv8) CPU is configured with SCTL.A
== 1 (alignment check enable). With SCTLR.A == 0 the code runs as expected.
After some investigation I came up with the following reproducer:
---8<-------8<-------8<-------8<-------8<-------8<-------8<-------
$ cat test.c
extern char
2020 Jun 01
2
Aarch64: unaligned access despite -mstrict-align
..._____
From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Sjoerd Meijer via llvm-dev <llvm-dev at lists.llvm.org>
Sent: 01 June 2020 16:32
To: llvm-dev at lists.llvm.org <llvm-dev at lists.llvm.org>; Jerome Forissier <jerome at forissier.org>
Cc: op-tee at lists.trustedfirmware.org <op-tee at lists.trustedfirmware.org>
Subject: Re: [llvm-dev] Aarch64: unaligned access despite -mstrict-align
Hi Jerome,
> Note the 'ldr x9, [x0]'. At this point there is no guarantee that x0 is a multiple of 8, so why is Clang generating this code?
I think the point is th...