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2019 Jan 22
2
Different SelectionDAGs for same CPU
...DAGs are the same:
Optimized legalized selection DAG: %bb.0 '_Z9test_mathv:'
SelectionDAG has 7 nodes:
t0: ch = EntryToken
t4: i32,ch = load<(dereferenceable load 4 from %ir.a)> t0, FrameIndex:i32<0>, undef:i32
t6: ch,glue = CopyToReg t0, Register:i32 $r4, t4
t7: ch = UISD::Ret t6, Register:i32 $r4, t6:1
But after it, one has 1 more node than the other
compiler 1
===== Instruction selection ends:
Selected selection DAG: %bb.0 '_Z9test_mathv:'
SelectionDAG has 8 nodes:
t0: ch = EntryToken
t1: i32 = add TargetFrameIndex:i32<0>, TargetConstant:i...