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| author | Clifford Wolf <clifford@clifford.at> | 2019-04-22 18:19:02 +0200 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2019-04-22 18:19:02 +0200 |
| commit | 4ad0ea5c3c325dc639829f6c6836353044585af5 (patch) | |
| tree | b7cc4109abee651d2a2045109017708e03ced040 /frontends | |
| parent | c0f9a74b121dd19e359038b6f6f76be0ffe3cc38 (diff) | |
| download | yosys-4ad0ea5c3c325dc639829f6c6836353044585af5.tar.gz yosys-4ad0ea5c3c325dc639829f6c6836353044585af5.tar.bz2 yosys-4ad0ea5c3c325dc639829f6c6836353044585af5.zip | |
Determine correct signedness and expression width in for loop unrolling, fixes #370
Signed-off-by: Clifford Wolf <clifford@clifford.at>
Diffstat (limited to 'frontends')
| -rw-r--r-- | frontends/ast/simplify.cc | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc index 76da5a97c..3e453bd7f 100644 --- a/frontends/ast/simplify.cc +++ b/frontends/ast/simplify.cc @@ -1085,7 +1085,12 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage, // eval 1st expression AstNode *varbuf = init_ast->children[1]->clone(); - while (varbuf->simplify(true, false, false, stage, 32, true, false)) { } + { + int expr_width_hint = -1; + bool expr_sign_hint = true; + varbuf->detectSignWidth(expr_width_hint, expr_sign_hint); + while (varbuf->simplify(true, false, false, stage, 32, true, false)) { } + } if (varbuf->type != AST_CONSTANT) log_file_error(filename, linenum, "Right hand side of 1st expression of generate for-loop is not constant!\n"); @@ -1107,7 +1112,12 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage, { // eval 2nd expression AstNode *buf = while_ast->clone(); - while (buf->simplify(true, false, false, stage, width_hint, sign_hint, false)) { } + { + int expr_width_hint = -1; + bool expr_sign_hint = true; + buf->detectSignWidth(expr_width_hint, expr_sign_hint); + while (buf->simplify(true, false, false, stage, expr_width_hint, expr_sign_hint, false)) { } + } if (buf->type != AST_CONSTANT) log_file_error(filename, linenum, "2nd expression of generate for-loop is not constant!\n"); @@ -1148,7 +1158,12 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage, // eval 3rd expression buf = next_ast->children[1]->clone(); - while (buf->simplify(true, false, false, stage, 32, true, false)) { } + { + int expr_width_hint = -1; + bool expr_sign_hint = true; + buf->detectSignWidth(expr_width_hint, expr_sign_hint); + while (buf->simplify(true, false, false, stage, expr_width_hint, expr_sign_hint, true)) { } + } if (buf->type != AST_CONSTANT) log_file_error(filename, linenum, "Right hand side of 3rd expression of generate for-loop is not constant!\n"); |