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[Bug middle-end/35903] false Warray-bounds warning when passing quoted string to function strcmp(arg,"no");
- From: "manu at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 19 Feb 2010 23:56:13 -0000
- Subject: [Bug middle-end/35903] false Warray-bounds warning when passing quoted string to function strcmp(arg,"no");
- References: <bug-35903-12775@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #9 from manu at gcc dot gnu dot org 2010-02-19 23:56 -------
This is not an uninitialized issue.
The reason this requires -O2 is that -Warray-bounds requires VRP to warn. The
gimple output already looks quite different.
-funsigned-char:
<D.1565>:
[pr35903.i : 309:15] D.1567 = __s1D.796 + 3;
[pr35903.i : 309:15] D.1568 = [pr35903.i : 309] *D.1567;
[pr35903.i : 310:11] D.1569 = (intD.0) D.1568;
[pr35903.i : 318:12] D.1570 = [pr35903.i : 311] &[pr35903.i : 311]
"AA"[0] + 3;
[pr35903.i : 318:12] D.1571 = [pr35903.i : 318] *D.1570;
[pr35903.i : 310:11] D.1572 = (intD.0) D.1571;
[pr35903.i : 308:10] __resultD.797 = D.1569 - D.1572;
<D.1566>:
<D.1556>:
-fsigned-char
<D.1566>:
[pr35903.i : 309:15] D.1568 = __s1D.796 + 3;
[pr35903.i : 309:15] D.1569 = [pr35903.i : 309] *D.1568;
[pr35903.i : 310:11] D.1570 = (intD.0) D.1569;
[pr35903.i : 311:12] D.1540 = (const unsigned charD.10 *) [pr35903.i :
318] "AA";
[pr35903.i : 318:12] D.1571 = D.1540 + 3;
[pr35903.i : 318:12] D.1572 = [pr35903.i : 318] *D.1571;
[pr35903.i : 310:11] D.1573 = (intD.0) D.1572;
[pr35903.i : 308:10] __resultD.797 = D.1570 - D.1573;
<D.1567>:
<D.1557>:
<D.1547>:
--
manu at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
OtherBugsDependingO|24639 |
nThis| |
Summary|false uninitialized warning |false Warray-bounds warning
|when passing quoted string |when passing quoted string
|to function |to function
|strcmp(arg,"no"); |strcmp(arg,"no");
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35903