On 12/26/2025 10:06 PM, Andrew Pinski wrote:
So the problem here is during LRA we are eliminating argp and trying to
simplify the RTL as we go but inside a debug insn, almost all subreg
are valid due to gen_lowpart_for_debug done during debug insn simplification.
So simplify_gen_subreg will fail on some subregs and return null.
This causes problems later on. The solution is create a raw SUBREG
like what is done in lra_substitute_pseudo for debug insns.
Bootstrapped and tested on x86_64-linux-gnu.
PR rtl-optimizaiton/123295
gcc/ChangeLog:
* lra-eliminations.cc (lra_eliminate_regs_1): For a debug
insn, create a raw SUBREG if simplify_gen_subreg fails.
gcc/testsuite/ChangeLog:
* gcc.dg/pr123295-1.c: New test.
Signed-off-by: Andrew Pinski<[email protected]>
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OK. Thanks for taking care of this.
jeff
