summaryrefslogtreecommitdiff
path: root/frontends/ast
diff options
context:
space:
mode:
authorClifford Wolf <clifford@clifford.at>2013-12-05 13:09:41 +0100
committerClifford Wolf <clifford@clifford.at>2013-12-05 13:09:41 +0100
commite935bb6edacf46e84959a2e7befa413497420a9a (patch)
treec49d0f6eb9cfe335533206a48e4cc37e97d14595 /frontends/ast
parent5c39948eadbcda58d0b880dc162572838dad01a2 (diff)
Added const folding support for $signed and $unsigned
Diffstat (limited to 'frontends/ast')
-rw-r--r--frontends/ast/simplify.cc7
1 files changed, 7 insertions, 0 deletions
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index 3d512d6f..fe4ff3f2 100644
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -1205,6 +1205,13 @@ skip_dynamic_range_lvalue_expansion:;
newNode = mkconst_bits(y.bits, sign_hint);
}
break;
+ case AST_TO_SIGNED:
+ case AST_TO_UNSIGNED:
+ if (children[0]->type == AST_CONSTANT) {
+ RTLIL::Const y = children[0]->bitsAsConst(width_hint, sign_hint);
+ newNode = mkconst_bits(y.bits, type == AST_TO_SIGNED);
+ }
+ break;
if (0) { case AST_BIT_AND: const_func = RTLIL::const_and; }
if (0) { case AST_BIT_OR: const_func = RTLIL::const_or; }
if (0) { case AST_BIT_XOR: const_func = RTLIL::const_xor; }