On 2014-09-09 5:39 AM, Robert Suchanek wrote:
Hi,
Following up the problem reported
https://gcc.gnu.org/ml/gcc/2014-09/msg00094.html
I am attaching the patch fixing the internal compiler error.
The problem appeared to be that the current program point was not
incremented after changing liveliness of a pseudo. In the attached testcase,
an early clobber pseudo register became dead but the result was overwritten
by subsequent calls to mark_regno_dead function returning false. As a result,
the live range of the pseudo was 0..1 but the lra_live_max_point was not
+1 higher leading to lack of initialization of internal structures and
processing random data, hence, the ICE.
The patch was bootstrapped and regtested on x86_64-unknown-linux-gnu.
The patch is ok to commit. I think I made a typo as other analogous
code contains '|='.
Thanks for fixing this, Robert.
2014-09-09 Robert Suchanek <robert.sucha...@imgtec.com>
gcc/
* lra-lives.c (process_bb_lives): Replace assignment with bitwise OR
assignment.
gcc/testsuite/
* gcc.target/mips/20140909.c: New test.
---
gcc/lra-lives.c | 6 +++---
gcc/testsuite/gcc.target/mips/20140909.c | 20 ++++++++++++++++++++
2 files changed, 23 insertions(+), 3 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/mips/20140909.c
diff --git a/gcc/lra-lives.c b/gcc/lra-lives.c
index f34517d..b72824e 100644
--- a/gcc/lra-lives.c
+++ b/gcc/lra-lives.c
@@ -680,9 +680,9 @@ process_bb_lives (basic_block bb, int &curr_point)
/* Mark early clobber outputs dead. */
for (reg = curr_id->regs; reg != NULL; reg = reg->next)
if (reg->type == OP_OUT && reg->early_clobber && ! reg->subreg_p)
- need_curr_point_incr = mark_regno_dead (reg->regno,
- reg->biggest_mode,
- curr_point);
+ need_curr_point_incr |= mark_regno_dead (reg->regno,
+ reg->biggest_mode,
+ curr_point);
for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
if (reg->type == OP_OUT && reg->early_clobber && ! reg->subreg_p)
diff --git a/gcc/testsuite/gcc.target/mips/20140909.c
b/gcc/testsuite/gcc.target/mips/20140909.c
new file mode 100644
index 0000000..dbdfb30
--- /dev/null
+++ b/gcc/testsuite/gcc.target/mips/20140909.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-skip-if "code quality test" { *-*-* } { "-O0" } { "" } } */
+
+NOMIPS16 int NoBarrier_AtomicIncrement(volatile int* ptr, int increment) {
+ int temp, temp2;
+ __asm__ __volatile__(".set push\n"
+ ".set noreorder\n"
+ "1:\n"
+ "ll %0, 0(%3)\n"
+ "addu %1, %0, %2\n"
+ "sc %1, 0(%3)\n"
+ "beqz %1, 1b\n"
+ "addu %1, %0, %2\n"
+ ".set pop\n"
+ : "=&r" (temp), "=&r" (temp2)
+ : "Ir" (increment), "r" (ptr)
+ : "memory");
+
+ return temp2;
+}
