Hi!
During profiledbootstrap, I'm seeing:
../../gcc/system.h: In function 'void autopref_multipass_init(const rtx_insn*,
int)':
../../gcc/system.h:367:29: warning: 'max_offset' may be used uninitialized in
this function [-Wmaybe-uninitialized]
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
^
../../gcc/haifa-sched.c:5603:11: note: 'max_offset' was declared here
int max_offset;
^~~~~~~~~~
and similarly for min_offset. The warning is a false positive just because
the compiler can't know that a PARALLEL should never have zero XVECLEN (pat, 0).
prev_base which is also set during the first iteration and thus not set
if n_elems is 0 already have an initializer for this reason.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2016-01-17 Jakub Jelinek <[email protected]>
* haifa-sched.c (autopref_multipass_init): Work around
-Wmaybe-uninitialized warning.
--- gcc/haifa-sched.c.jj 2016-01-04 14:55:52.000000000 +0100
+++ gcc/haifa-sched.c 2016-01-16 11:30:04.782594233 +0100
@@ -5599,8 +5599,8 @@ autopref_multipass_init (const rtx_insn
int i = 0;
rtx prev_base = NULL_RTX;
- int min_offset;
- int max_offset;
+ int min_offset = 0;
+ int max_offset = 0;
for (i = 0; i < n_elems; i++)
{
Jakub
