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compiler: Evaluate array range expression once before iteration.

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Fixes issue 34.

From-SVN: r219045
This commit is contained in:
Ian Lance Taylor 2014-12-23 18:39:19 +00:00
parent 34b42fb0ea
commit 6a2cd809f7
1 changed files with 5 additions and 2 deletions
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7
gcc/go/gofrontend/statements.cc
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@ -5558,8 +5558,9 @@ For_range_statement::lower_range_array(Gogo* gogo,
// The loop we generate:
// len_temp := len(range)
// range_temp := range
// for index_temp = 0; index_temp < len_temp; index_temp++ {
// value_temp = range[index_temp]
// value_temp = range_temp[index_temp]
// index = index_temp
// value = value_temp
// original body
@ -5573,9 +5574,11 @@ For_range_statement::lower_range_array(Gogo* gogo,
Block* init = new Block(enclosing, loc);
Expression* ref = this->make_range_ref(range_object, range_temp, loc);
range_temp = Statement::make_temporary(NULL, ref, loc);
Expression* len_call = this->call_builtin(gogo, "len", ref, loc);
Temporary_statement* len_temp = Statement::make_temporary(index_temp->type(),
len_call, loc);
init->add_statement(range_temp);
init->add_statement(len_temp);
Expression* zexpr = Expression::make_integer_ul(0, NULL, loc);
@ -5605,7 +5608,7 @@ For_range_statement::lower_range_array(Gogo* gogo,
{
iter_init = new Block(body_block, loc);
ref = this->make_range_ref(range_object, range_temp, loc);
ref = Expression::make_temporary_reference(range_temp, loc);
Expression* ref2 = Expression::make_temporary_reference(index_temp, loc);
Expression* index = Expression::make_index(ref, ref2, NULL, NULL, loc);