https://bugs.llvm.org/show_bug.cgi?id=49384
Bug ID: 49384
Summary: [ARM] Expressions incorrectly reordered by
optimization
Product: new-bugs
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: xtk...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 24579
--> https://bugs.llvm.org/attachment.cgi?id=24579&action=edit
A reproducer code derived from the Ruby programming language project
When supplied with -O2 or higher (-O3, -Os or -Oz) optimization option, clang
incorrectly reorders two expressions for 32-bit ARM targets.
This issue was first discovered for Android (with target
armv7a-linux-androideabi16), but it is reproducible for GNU/Linux (with target
armv7a-softfloat-linux-gnueabi).
A reproducer code written in C is attached. When compiled with -O2
-DWORKAROUND=0 and run, it aborts due to assertion failure. This assertion is
expected to hold at any time.
I suppose this issue is specific to 32-bit ARM, and I confirmed that the
reproducer code exits normally with targets
{aarch64,i686,powerpc64le,riscv64,x86_64}-unknown-linux-gnu.
This issue was discovered in the Ruby programming language project and was
first reported to https://bugs.ruby-lang.org/issues/17540
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