https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65063
Bug ID: 65063
Summary: gcc.dg/vect/vect-double-reduc-6.c FAILs with -O3
-fno-tree-loop-ivcanon -fno-tree-vectorize
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Created attachment 34754
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34754&action=edit
reduced testcase
Output (on reduced testcase):
$ gcc -Wall -W testcase.c -O3 -fno-tree-loop-ivcanon -fno-tree-vectorize
$ ./a.out
Aborted
The assembly code shows:
...
mov DWORD PTR out[rip], 0 # out,
mov DWORD PTR out[rip+4], 16 # out,
mov DWORD PTR out[rip+8], 256 # out,
mov DWORD PTR out[rip+12], 16384 # out,
call abort #
out[] = {0, 16, 256, 16384}
but should be
out[] = {0, 16, 256, 4096}
(gdb) p in
$1 = {{0, 0, 0, 0}, {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}, {2, 2, 2, 2}, {2,
2, 2, 2}, {2, 2, 2, 2}, {3, 3, 3, 3}}
(gdb) p out
$2 = {0, 16, 256, 16384}
in[] looks fine, also in the assembly
The first dump where "16384" appears is 191r.cse1. This might be the same as
PR63593.
Tested revisions:
r220676 - fail
