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Optimise out redundant uOPs, where the output register is never read.

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This commit is contained in:
SarahW 2019-02-10 12:32:25 +00:00
commit 3f2d9ecf87
4 changed files with 200 additions and 57 deletions
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5
src/codegen_ir.c
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@ -21,6 +21,8 @@ void codegen_ir_compile(ir_data_t *ir, codeblock_t *block)
int jump_target_at_end = -1;
int c;
codegen_reg_mark_as_required();
codegen_reg_process_dead_list(ir);
block_write_data = codeblock_allocator_get_ptr(block->head_mem_block);
block_pos = 0;
codegen_backend_prologue(block);
@ -45,6 +47,9 @@ void codegen_ir_compile(ir_data_t *ir, codeblock_t *block)
}
}
if ((uop->type & UOP_MASK) == UOP_INVALID)
continue;
if (uop->type & UOP_TYPE_PARAMS_REGS)
{
codegen_reg_alloc_register(uop->dest_reg_a, uop->src_reg_a, uop->src_reg_b, uop->src_reg_c);