From: claziss <claz...@synopsys.com>
Make sure we mark the hw-loop labels as beeing used.
gcc/
2017-09-19 Claudiu Zissulescu <claz...@synopsys.com>
* config/arc/arc.c (hwloop_optimize): Update hw-loop's end/start
labels number of usages.
gcc/testsuite
2017-09-19 Claudiu Zissulescu <claz...@synopsys.com>
* gcc.target/arc/loop-2.cpp: New test.
---
gcc/config/arc/arc.c | 3 +++
gcc/testsuite/gcc.target/arc/loop-2.cpp | 18 ++++++++++++++++++
2 files changed, 21 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/arc/loop-2.cpp
diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
index 25f123c..964815a 100644
--- a/gcc/config/arc/arc.c
+++ b/gcc/config/arc/arc.c
@@ -7702,6 +7702,9 @@ hwloop_optimize (hwloop_info loop)
/* Insert the loop end label before the last instruction of the
loop. */
emit_label_after (end_label, loop->last_insn);
+ /* Make sure we mark the begining and end label as used. */
+ LABEL_NUSES (loop->end_label)++;
+ LABEL_NUSES (loop->start_label)++;
return true;
}
diff --git a/gcc/testsuite/gcc.target/arc/loop-2.cpp
b/gcc/testsuite/gcc.target/arc/loop-2.cpp
new file mode 100644
index 0000000..d1dc917
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arc/loop-2.cpp
@@ -0,0 +1,18 @@
+/* { dg-options "-O2" } *
+/* { dg-do assemble } */
+
+/* This file fails to assemble if we forgot to increase the number of
+ uses for loop's start and end labels. */
+int a, c, d;
+int *b;
+void fn1(int p1) {
+ if (d == 5)
+ for (int i; i < p1; ++i)
+ if (c)
+ b[i] = c;
+ else
+ int t = a = t;
+ else
+ for (int i; i < p1; ++i)
+ b[i] = 0;
+}
--
1.9.1
