https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92098
Bug ID: 92098
Summary: After r262333, the following code cannot be vectorized
on powerpc64le.
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: helijia at gcc dot gnu.org
Target Milestone: ---
Created attachment 47035
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47035&action=edit
dump file(Includes dump files that can be vectorized and not vectorized)
For the following code
---
#define NIL 0
typedef struct {
unsigned int hash_size;
unsigned short * head, * prev;
unsigned int w_size;
} deflate_state;
void slide_hash(deflate_state *s)
{
unsigned n, m;
unsigned short *p;
unsigned int wsize = s->w_size;
n = s->hash_size;
p = &s->head[n];
do {
m = *--p;
*p = (unsigned short)(m >= wsize ? m - wsize : NIL);
} while (--n);
}
---
The compile command I used is
cc1 a.c -Ofast -fdump-tree-vect-details-all -fdump-tree-slp-details-all
we found r262333 will cause it can not be vectorized. Because
a.c:20:5: note: vect_is_simple_use: vectype vector(4) unsigned intD.4
a.c:20:5: note: not vectorized: relevant stmt not supported: patt_37 =
wsize_12 <= m_16;
a.c:20:5: note: bad operation or unsupported loop bound.
But before the commit this code can be vectorized.
Attachment is the file I dumped
