WIP: Trying to promote const local array using GVN pass #5
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tesuji
commented
Jun 12, 2024
| // [255, 105, 15, 39, 62, 251, 191, 178, 9, 4, 56, 221], | ||
| // [193, 164, 194, 197, 6, 243, 218, 171, 87, 247, 104, 42], | ||
| // ]; | ||
| let _darr = *&[ |
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This returns Some(OpTy { op: Indirect(MemPlace { ptr: alloc2<imm>, meta: None, misaligned: None }), ty: [i32; 32] })
tesuji
commented
Jun 12, 2024
| // CHECK: let [[array_lit:_.*]]: [i32; 32]; | ||
| // CHECK: debug _arr => [[arr:_.*]]; | ||
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| let _arr = [ |
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With commits[3], this now returns as a immutable memplace: Some(OpTy { op: Indirect(MemPlace { ptr: alloc3<imm>, meta: None, misaligned: None }), ty: [i32; 32] }).
But in the mir diff, _arr still is not promoted.
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Rewriting of rust-lang#125916 which used PromoteTemps pass.
Current status
commits[1..]doesn't change the test diff.I'm trying to returnThat is not enough to promote the array.OpTy { op: Indirect(MemPlace { .. }), ty: [i32; 32] }foreval_to_const(array). Becauseeval_to_const(*&array)is returning a similiar value.