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In the added C++ testcase, a stack slot at a negative sp offset is used to hold a value across a call. There are a couple of causes that directly lead to this outcome: - the -fstack-clash-protection and -fnon-call-exception options, that cause arm_frame_pointer_required to flip from false to true when the first pseudo gets spilled to memory; - when the affected pseudo is spilled to memory, we fail to update lra regno info, because the insns that reference it are already on the lra_constraint_insn_stack; There is another potentially-related issue: - when we notice that the frame pointer can no longer be eliminated to the stack pointer, we immediately clear can_eliminate, and also prev_can_eliminate, but update_reg_eliminate relied on the latter to tell that it needs to propagate a previous_offset to the newly-selected elimination, or restore the original offsets. This patch ensures that we update insn register info after spilling a pseudo to memory, and enables update_reg_eliminate to recognize the case in which a previously-preferred elimination is disabled regardless of prev_can_eliminate. for gcc/ChangeLog PR rtl-optimization/120424 PR middle-end/118939 * lra-spills.cc (spill_pseudos): Update insn regno info. * lra-eliminations.cc (update_reg_eliminate): Recognize disabling of active elimination regardless of prev_can_eliminate. for gcc/testsuite/ChangeLog PR rtl-optimization/120424 PR middle-end/118939 * g++.target/arm/pr120424.C: New. * gnat.dg/controlled9.adb: New. * gnat.dg/controlled9_pkg.ads: New.
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