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Diffstat (limited to 'powerpc/CSE2deps.v')
-rw-r--r-- | powerpc/CSE2deps.v | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/powerpc/CSE2deps.v b/powerpc/CSE2deps.v new file mode 100644 index 00000000..4592f408 --- /dev/null +++ b/powerpc/CSE2deps.v @@ -0,0 +1,35 @@ +(* *************************************************************) +(* *) +(* The Compcert verified compiler *) +(* *) +(* David Monniaux CNRS, VERIMAG *) +(* *) +(* Copyright VERIMAG. All rights reserved. *) +(* This file is distributed under the terms of the INRIA *) +(* Non-Commercial License Agreement. *) +(* *) +(* *************************************************************) + +Require Import BoolEqual Coqlib. +Require Import AST Integers Floats. +Require Import Values Memory Globalenvs Events. +Require Import Op. + + +Definition can_swap_accesses_ofs ofsr chunkr ofsw chunkw := + (0 <=? ofsw) && (ofsw <=? (Ptrofs.modulus - largest_size_chunk)) + && (0 <=? ofsr) && (ofsr <=? (Ptrofs.modulus - largest_size_chunk)) + && ((ofsw + size_chunk chunkw <=? ofsr) || + (ofsr + size_chunk chunkr <=? ofsw)). + +Definition may_overlap chunk addr args chunk' addr' args' := + match addr, addr', args, args' with + | (Aindexed ofs), (Aindexed ofs'), + (base :: nil), (base' :: nil) => + if peq base base' + then negb (can_swap_accesses_ofs (Int.unsigned ofs') chunk' (Int.unsigned ofs) chunk) + else true + | (Ainstack ofs), (Ainstack ofs'), _, _ => + negb (can_swap_accesses_ofs (Ptrofs.unsigned ofs') chunk' (Ptrofs.unsigned ofs) chunk) + | _, _, _, _ => true + end. |