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support repeat loops with constant repeat counts outside of constant functions

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This commit is contained in:
Zachary Snow 2019-04-09 12:28:32 -04:00
parent 22035c20ff
commit 5855024ccc
3 changed files with 68 additions and 1 deletions
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21
frontends/ast/simplify.cc
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@ -1030,7 +1030,26 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
log_file_error(filename, linenum, "While loops are only allowed in constant functions!\n");
if (type == AST_REPEAT)
log_file_error(filename, linenum, "Repeat loops are only allowed in constant functions!\n");
{
AstNode *count = children[0];
AstNode *body = children[1];
// eval count expression
while (count->simplify(true, false, false, stage, 32, true, false)) { }
if (count->type != AST_CONSTANT)
log_file_error(filename, linenum, "Repeat loops outside must have constant repeat counts!\n");
// convert to a block with the body repeated n times
type = AST_BLOCK;
children.clear();
for (int i = 0; i < count->bitsAsConst().as_int(); i++)
children.insert(children.begin(), body->clone());
delete count;
delete body;
did_something = true;
}
// unroll for loops and generate-for blocks
if ((type == AST_GENFOR || type == AST_FOR) && children.size() != 0)