On Fri, Feb 28, 2025 at 11:09:21AM +0100, Richard Biener wrote:
> When the C++ frontend clones a CTOR we do not copy ASM_EXPR constraints
> fully as walk_tree does not recurse to TREE_PURPOSE of TREE_LIST nodes.
> At this point doing that seems too dangerous so the following instead
> avoids gimplification of ASM_EXPRs to clobber the shared constraints
> and unshares it there, like it also unshares TREE_VALUE when it
> re-writes a "+" output constraint to separate "=" output and matching
> input constraint.
>
> Bootstrapped and tested on x86_64-unknown-linux-gnu, OK?
>
> Thanks,
> Richard.
>
> PR middle-end/66279
> * gimplify.cc (gimplify_asm_expr): Copy TREE_PURPOSE before
> rewriting it for "+" processing.
>
> * g++.dg/pr66279.C: New testcase.
LGTM.
Jakub
