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Rewrite byte_extract from multi-dimensional array #8705

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Rewrite byte_extract from multi-dimensional array #8705

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24 changes: 23 additions & 1 deletion src/util/pointer_offset_size.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -793,7 +793,29 @@ std::optional<exprt> get_subexpression_at_offset(
const exprt &other_factor =
offset_mult.op0().is_constant() ? offset_mult.op1() : offset_mult.op0();

if(const_factor % (*elem_size_bits / config.ansi_c.char_width) != 0)
const mp_integer elem_size_bytes =
*elem_size_bits / config.ansi_c.char_width;
if(
array_type->element_type().id() == ID_array &&
const_factor < elem_size_bytes && elem_size_bytes % const_factor == 0)
{
const mp_integer index_divider = elem_size_bytes / const_factor;
exprt index = div_exprt{
other_factor, from_integer(index_divider, other_factor.type())};
exprt remaining_offset = mult_exprt{
mod_exprt{
other_factor, from_integer(index_divider, other_factor.type())},
from_integer(const_factor, other_factor.type())};

return get_subexpression_at_offset(
index_exprt{
expr,
typecast_exprt::conditional_cast(index, array_type->index_type())},
remaining_offset,
target_type,
ns);
}
else if(const_factor % elem_size_bytes != 0)
return {};

exprt index = mult_exprt{
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