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* Fix empty string arguments to display (#3484).

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This commit is contained in:
Wilson Snyder 2022-07-09 08:30:57 -04:00
parent a4fddb3fbe
commit 5f3316d3dc
5 changed files with 38 additions and 29 deletions
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@ -14,6 +14,7 @@ Verilator 4.225 devel
**Minor:**
* Fix incorrect bit op tree optimization (#3470). [algrobman]
* Fix empty string arguments to display (#3484). [Grulfen]
* Fix table misoptimizing away display (#3488). [Stefan Post]

4
src/V3LinkResolve.cpp
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@ -352,13 +352,14 @@ private:
while (argp) {
if (skipCount) {
argp = argp->nextp();
skipCount--;
--skipCount;
continue;
}
const AstConst* const constp = VN_CAST(argp, Const);
const bool isFromString = (constp) ? constp->num().isFromString() : false;
if (isFromString) {
const int numchars = argp->dtypep()->width() / 8;
if (!constp->num().toString().empty()) {
string str(numchars, ' ');
// now scan for % operators
bool inpercent = false;
@ -389,6 +390,7 @@ private:
}
}
newFormat.append(str);
}
AstNode* const nextp = argp->nextp();
argp->unlinkFrBack();
VL_DO_DANGLING(pushDeletep(argp), argp);

2
test_regress/t/t_display_merge.out
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@ -1,5 +1,7 @@
Merge:
This should merge
Merge:
This should also merge
f
1=1 a=top.t 1=1 1=1 b=top.t 1=1
pre

2
test_regress/t/t_display_merge.pl
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@ -20,7 +20,7 @@ execute(
);
file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}__stats.txt",
qr/Node count, DISPLAY \s+ 41 \s+ 27 \s+ 27 \s+ 6/);
qr/Node count, DISPLAY \s+ 44 \s+ 27 \s+ 27 \s+ 6/);
ok(1);
1;

4
test_regress/t/t_display_merge.v
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@ -19,6 +19,10 @@ module t (/*AUTOARG*/);
$write("should ");
$display("merge");
$display("Merge:");
$write("This ", "", "should ", "", "also ");
$display("merge");
$display("f");
$write(" 1=%0d a=%m 1=%0d", one, one);
$display(" 1=%0d b=%m 1=%0d", one, one);