[gcc r13-6865] predict: Don't emit -Wsuggest-attribute=cold warning for functions which already have that attribute
Jakub Jelinek
jakub@gcc.gnu.org
Sun Mar 26 18:15:57 GMT 2023
https://gcc.gnu.org/g:7eca91d4781bb3df941f25c30b971dac66ba1b3d
commit r13-6865-g7eca91d4781bb3df941f25c30b971dac66ba1b3d
Author: Jakub Jelinek <jakub@redhat.com>
Date: Sun Mar 26 20:15:05 2023 +0200
predict: Don't emit -Wsuggest-attribute=cold warning for functions which already have that attribute [PR105685]
In the following testcase, we predict baz to have cold
entry regardless of the user supplied attribute (as it call
unconditionally a cold function), but still issue
a -Wsuggest-attribute=cold warning despite it having that attribute
already.
The following patch avoids that.
2023-03-26 Jakub Jelinek <jakub@redhat.com>
PR ipa/105685
* predict.cc (compute_function_frequency): Don't call
warn_function_cold if function already has cold attribute.
* c-c++-common/cold-2.c: New test.
Diff:
---
gcc/predict.cc | 4 +++-
gcc/testsuite/c-c++-common/cold-2.c | 19 +++++++++++++++++++
2 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/gcc/predict.cc b/gcc/predict.cc
index 851117e5fac..a0dc409648f 100644
--- a/gcc/predict.cc
+++ b/gcc/predict.cc
@@ -4033,7 +4033,9 @@ compute_function_frequency (void)
}
node->frequency = NODE_FREQUENCY_UNLIKELY_EXECUTED;
- warn_function_cold (current_function_decl);
+ if (lookup_attribute ("cold", DECL_ATTRIBUTES (current_function_decl))
+ == NULL)
+ warn_function_cold (current_function_decl);
if (ENTRY_BLOCK_PTR_FOR_FN (cfun)->count.ipa() == profile_count::zero ())
return;
FOR_EACH_BB_FN (bb, cfun)
diff --git a/gcc/testsuite/c-c++-common/cold-2.c b/gcc/testsuite/c-c++-common/cold-2.c
new file mode 100644
index 00000000000..7f78496fb82
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/cold-2.c
@@ -0,0 +1,19 @@
+/* PR ipa/105685 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wsuggest-attribute=cold" } */
+
+extern void foo (char *, char const *, int);
+
+__attribute__((cold)) char *
+bar (int x)
+{
+ static char b[42];
+ foo (b, "foo", x);
+ return b;
+}
+
+__attribute__((cold)) char *
+baz (int x) /* { dg-bogus "function might be candidate for attribute 'cold'" } */
+{
+ return bar (x);
+}
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