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My recent patch for PR112918 triggered a hidden bug in LRA on MIPS. A pseudo is matched to a register constraint and assigned to a hard registers at the first constraint sub-pass but later it is matched to X constraint. Keeping this pseudo in the register (MD0) prevents to use the same register for another pseudo in the insn and this results in LRA failure. The patch fixes this by spilling the pseudo at the constraint subpass when the chosen alternative constraint not require hard register anymore. gcc/ChangeLog: PR middle-end/113354 * lra-constraints.cc (curr_insn_transform): Spill pseudo only used in the insn if the corresponding operand does not require hard register anymore. |
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