ir3/lower_spill: Fix corner case with oob offsets
If the base register is killed, it may be reused as the destination of a
ldp. In that case we should just skip resetting it afterwards.
Fixes regressions in dEQP-VK.ssbo.layout.random.scalar.38 later.
Fixes: 9912c61362
("ir3/spill: Support larger spill slot offset")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15288>
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@ -65,8 +65,16 @@ set_base_reg(struct ir3_instruction *mem, unsigned val)
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static void
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reset_base_reg(struct ir3_instruction *mem)
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{
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/* If the base register is killed, then we don't need to clobber it and it
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* may be reused as a destination so we can't always clobber it after the
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* instruction anyway.
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*/
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struct ir3_register *base = mem->srcs[0];
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if (base->flags & IR3_REG_KILL)
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return;
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struct ir3_instruction *mov = ir3_instr_create(mem->block, OPC_MOV, 1, 1);
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ir3_dst_create(mov, mem->srcs[0]->num, mem->srcs[0]->flags);
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ir3_dst_create(mov, base->num, base->flags);
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ir3_src_create(mov, INVALID_REG, IR3_REG_IMMED)->uim_val = 0;
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mov->cat1.dst_type = mov->cat1.src_type = TYPE_U32;
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