diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2018-07-23 09:48:56 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2018-07-23 09:48:56 +0200 |
| commit | 315aa691f486bfe71bae0a5fc8828db26daebb56 (patch) | |
| tree | 6c1df506f9a1846bd981daed7c17c39dec0df523 /gcc | |
| parent | d9690d237cf5d195322e2ebbd29f13b1273ecc68 (diff) | |
| download | gcc-315aa691f486bfe71bae0a5fc8828db26daebb56.zip gcc-315aa691f486bfe71bae0a5fc8828db26daebb56.tar.gz gcc-315aa691f486bfe71bae0a5fc8828db26daebb56.tar.bz2 | |
re PR c++/86569 (-Wnonnull-compare affects code generation since r233684)
PR c++/86569
* cp-gimplify.c (cp_fold): Don't fold comparisons into other kind
of expressions other than INTEGER_CST regardless of TREE_NO_WARNING
or warn_nonnull_compare.
* g++.dg/warn/Wnonnull-compare-9.C: New test.
From-SVN: r262928
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cp/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/cp/cp-gimplify.c | 15 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/warn/Wnonnull-compare-9.C | 11 |
4 files changed, 33 insertions, 5 deletions
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog index 125f169..f1185c4 100644 --- a/gcc/cp/ChangeLog +++ b/gcc/cp/ChangeLog @@ -1,3 +1,10 @@ +2018-07-23 Jakub Jelinek <jakub@redhat.com> + + PR c++/86569 + * cp-gimplify.c (cp_fold): Don't fold comparisons into other kind + of expressions other than INTEGER_CST regardless of TREE_NO_WARNING + or warn_nonnull_compare. + 2018-07-19 Paolo Carlini <paolo.carlini@oracle.com> Revert fix for c++/59480 (and testsuite followup) diff --git a/gcc/cp/cp-gimplify.c b/gcc/cp/cp-gimplify.c index 356b188..28802b5 100644 --- a/gcc/cp/cp-gimplify.c +++ b/gcc/cp/cp-gimplify.c @@ -2381,21 +2381,26 @@ cp_fold (tree x) else x = fold (x); - if (TREE_NO_WARNING (org_x) - && warn_nonnull_compare - && COMPARISON_CLASS_P (org_x)) + /* This is only needed for -Wnonnull-compare and only if + TREE_NO_WARNING (org_x), but to avoid that option affecting code + generation, we do it always. */ + if (COMPARISON_CLASS_P (org_x)) { if (x == error_mark_node || TREE_CODE (x) == INTEGER_CST) ; else if (COMPARISON_CLASS_P (x)) - TREE_NO_WARNING (x) = 1; + { + if (TREE_NO_WARNING (org_x) && warn_nonnull_compare) + TREE_NO_WARNING (x) = 1; + } /* Otherwise give up on optimizing these, let GIMPLE folders optimize those later on. */ else if (op0 != TREE_OPERAND (org_x, 0) || op1 != TREE_OPERAND (org_x, 1)) { x = build2_loc (loc, code, TREE_TYPE (org_x), op0, op1); - TREE_NO_WARNING (x) = 1; + if (TREE_NO_WARNING (org_x) && warn_nonnull_compare) + TREE_NO_WARNING (x) = 1; } else x = org_x; diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index ecf7b05..b5e2a54 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2018-07-23 Jakub Jelinek <jakub@redhat.com> + + PR c++/86569 + * g++.dg/warn/Wnonnull-compare-9.C: New test. + 2018-07-20 Martin Sebor <msebor@redhat.com> PR middle-end/82063 diff --git a/gcc/testsuite/g++.dg/warn/Wnonnull-compare-9.C b/gcc/testsuite/g++.dg/warn/Wnonnull-compare-9.C new file mode 100644 index 0000000..f8fa3c0 --- /dev/null +++ b/gcc/testsuite/g++.dg/warn/Wnonnull-compare-9.C @@ -0,0 +1,11 @@ +// PR c++/86569 +// { dg-do compile } +// { dg-options "-fcompare-debug=-Wnonnull-compare" } + +bool b; + +int +main () +{ + return ((!b) != 0); +} |