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-rw-r--r--frontends/ast/genrtlil.cc23
-rwxr-xr-xtests/gen-tests-makefile.sh2
-rw-r--r--tests/svtypes/struct_array.sv3
3 files changed, 22 insertions, 6 deletions
diff --git a/frontends/ast/genrtlil.cc b/frontends/ast/genrtlil.cc
index 1016ef636..9f458530d 100644
--- a/frontends/ast/genrtlil.cc
+++ b/frontends/ast/genrtlil.cc
@@ -1444,6 +1444,19 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
log_file_error(filename, location.first_line, "Single range expected.\n");
int source_width = id2ast->range_left - id2ast->range_right + 1;
int source_offset = id2ast->range_right;
+ int item_left = source_width - 1;
+ int item_right = 0;
+
+ // Check for item in struct/union.
+ AST::AstNode *item_node;
+ if (attributes.count(ID::wiretype) && (item_node = attributes[ID::wiretype]) &&
+ (item_node->type == AST_STRUCT_ITEM || item_node->type == AST_STRUCT || item_node->type == AST_UNION))
+ {
+ // Clamp chunk to range of item within struct/union.
+ item_left = item_node->range_left;
+ item_right = item_node->range_right;
+ }
+
if (!children[0]->range_valid) {
AstNode *left_at_zero_ast = children[0]->children[0]->clone();
AstNode *right_at_zero_ast = children[0]->children.size() >= 2 ? children[0]->children[1]->clone() : left_at_zero_ast->clone();
@@ -1481,7 +1494,7 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
chunk.offset = children[0]->range_right - source_offset;
if (id2ast->range_swapped)
chunk.offset = (id2ast->range_left - id2ast->range_right + 1) - (chunk.offset + chunk.width);
- if (chunk.offset >= source_width || chunk.offset + chunk.width < 0) {
+ if (chunk.offset > item_left || chunk.offset + chunk.width < item_right) {
if (chunk.width == 1)
log_file_warning(filename, location.first_line, "Range select out of bounds on signal `%s': Setting result bit to undef.\n",
str.c_str());
@@ -1490,12 +1503,12 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
children[0]->range_left, children[0]->range_right, str.c_str(), chunk.width);
chunk = RTLIL::SigChunk(RTLIL::State::Sx, chunk.width);
} else {
- if (chunk.width + chunk.offset > source_width) {
- add_undef_bits_msb = (chunk.width + chunk.offset) - source_width;
+ if (chunk.offset + chunk.width - 1 > item_left) {
+ add_undef_bits_msb = (chunk.offset + chunk.width - 1) - item_left;
chunk.width -= add_undef_bits_msb;
}
- if (chunk.offset < 0) {
- add_undef_bits_lsb = -chunk.offset;
+ if (chunk.offset < item_right) {
+ add_undef_bits_lsb = item_right - chunk.offset;
chunk.width -= add_undef_bits_lsb;
chunk.offset += add_undef_bits_lsb;
}
diff --git a/tests/gen-tests-makefile.sh b/tests/gen-tests-makefile.sh
index cde9ab1b9..3df36a963 100755
--- a/tests/gen-tests-makefile.sh
+++ b/tests/gen-tests-makefile.sh
@@ -75,7 +75,7 @@ generate_tests() {
if [[ $do_sv = true ]]; then
for x in *.sv; do
if [ ! -f "${x%.sv}.ys" ]; then
- generate_ys_test "$x" "-p \"prep -top top; sat -verify -prove-asserts\" $yosys_args"
+ generate_ys_test "$x" "-p \"prep -top top; sat -enable_undef -verify -prove-asserts\" $yosys_args"
fi;
done
fi;
diff --git a/tests/svtypes/struct_array.sv b/tests/svtypes/struct_array.sv
index a0b84640d..b87f936aa 100644
--- a/tests/svtypes/struct_array.sv
+++ b/tests/svtypes/struct_array.sv
@@ -18,6 +18,9 @@ module top;
end
always_comb assert(s==64'h4200_0012_3400_FFFC);
+ always_comb assert(s.b[23:16]===8'hxx);
+ always_comb assert(s.b[19:12]===8'hxf);
+ always_comb assert(s.a[0][3:-4]===8'h0x);
struct packed {
bit [7:0] [7:0] a; // 8 element packed array of bytes