On 9/2/26 10:28 PM, Yongqiang Tian wrote:
The simple-LRA decision uses get_max_uid() as an approximation of the
number of instructions. Debug instructions consume UIDs, so enabling
debug information can cross the threshold and change register allocation
and generated code.
Use get_max_insn_count(), which excludes debug instructions, so the
decision depends only on ordinary instructions. Add an -fcompare-debug
regression test.
Bootstrapped and regression tested on x86_64-pc-linux-gnu.
PR debug/108784
gcc/ChangeLog:
* ira.cc (ira): Use get_max_insn_count instead of get_max_uid when
selecting simple LRA.
gcc/testsuite/ChangeLog:
* gcc.dg/pr108784.c: New test.
Assisted-by: OpenAI Codex 5.6 Sol
Assisted-by: Claude
Signed-off-by: Yongqiang Tian<[email protected]>
I don't recognize your email/name, so I'm going to assume no commit
privileges at this time. So I went ahead and pushed this to the trunk
given Vladimir's ack.
These bugs are often hard to find, so thanks as ton for chasing it down!
jeff
