From: Tamar Christina <tamar.christina@arm.com>
To: gcc-patches@gcc.gnu.org
Cc: nd@arm.com, rguenther@suse.de, ook@ucw.cz
Subject: [PATCH]middle-end vect: Exclude TOP permute from blend considerations
Date: Mon, 14 Dec 2020 15:17:13 +0000 [thread overview]
Message-ID: <patch-13912-tamar@arm.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 1862 bytes --]
Hi All,
Similarly to UNKNOWN permutes, TOP needs to be excluded from being considered
for blends because it produces no permute to check.
Bootstrapped Regtested on aarch64-none-linux-gnu, x86_64-pc-linux-gnu
and no issues.
Committed under the GCC obvious rules.
Thanks,
Tamar
gcc/ChangeLog:
PR middle-end/98264
* tree-vect-slp-patterns.c (linear_loads_p): Exclude TOP permute.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr98264.c: New test.
--- inline copy of patch --
diff --git a/gcc/testsuite/gcc.target/i386/pr98264.c b/gcc/testsuite/gcc.target/i386/pr98264.c
new file mode 100644
index 0000000000000000000000000000000000000000..ea235277911f2a48b4b6f2ccd75a4f9000918599
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr98264.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-O3 -w" } */
+
+a[], g[], h[];
+double b, c;
+double j[];
+i;
+l() {
+ int e = 0;
+ for (; e < 80; e += 4) {
+ a[0] = h[e];
+ a[1] = h[e + 1];
+ j[0] = a[0] - c;
+ j[1] = a[1] + b;
+ __attribute__(()) k = *(double *)a, e, f = e = 0;
+ *g = k;
+ double *d = j;
+ for (; e < 2; e++)
+ if (d[e])
+ i = f;
+ }
+}
diff --git a/gcc/tree-vect-slp-patterns.c b/gcc/tree-vect-slp-patterns.c
index bb2830d1d35d1607d1566868ffbcead97e4790d7..fede88923af8521ee4954c8ae27b0e589f975610 100644
--- a/gcc/tree-vect-slp-patterns.c
+++ b/gcc/tree-vect-slp-patterns.c
@@ -240,7 +240,8 @@ linear_loads_p (slp_tree_to_load_perm_map_t *perm_cache, slp_tree root)
{
complex_load_perm_t res = linear_loads_p (perm_cache, child);
kind = vect_merge_perms (kind, res.first);
- if (kind == PERM_UNKNOWN)
+ /* Unknown and Top are not valid on blends as they produce no permute. */
+ if (kind == PERM_UNKNOWN || kind == PERM_TOP)
return retval;
all_loads.safe_push (res.second);
}
--
[-- Attachment #2: rb13912.patch --]
[-- Type: text/x-diff, Size: 1375 bytes --]
diff --git a/gcc/testsuite/gcc.target/i386/pr98264.c b/gcc/testsuite/gcc.target/i386/pr98264.c
new file mode 100644
index 0000000000000000000000000000000000000000..ea235277911f2a48b4b6f2ccd75a4f9000918599
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr98264.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-O3 -w" } */
+
+a[], g[], h[];
+double b, c;
+double j[];
+i;
+l() {
+ int e = 0;
+ for (; e < 80; e += 4) {
+ a[0] = h[e];
+ a[1] = h[e + 1];
+ j[0] = a[0] - c;
+ j[1] = a[1] + b;
+ __attribute__(()) k = *(double *)a, e, f = e = 0;
+ *g = k;
+ double *d = j;
+ for (; e < 2; e++)
+ if (d[e])
+ i = f;
+ }
+}
diff --git a/gcc/tree-vect-slp-patterns.c b/gcc/tree-vect-slp-patterns.c
index bb2830d1d35d1607d1566868ffbcead97e4790d7..fede88923af8521ee4954c8ae27b0e589f975610 100644
--- a/gcc/tree-vect-slp-patterns.c
+++ b/gcc/tree-vect-slp-patterns.c
@@ -240,7 +240,8 @@ linear_loads_p (slp_tree_to_load_perm_map_t *perm_cache, slp_tree root)
{
complex_load_perm_t res = linear_loads_p (perm_cache, child);
kind = vect_merge_perms (kind, res.first);
- if (kind == PERM_UNKNOWN)
+ /* Unknown and Top are not valid on blends as they produce no permute. */
+ if (kind == PERM_UNKNOWN || kind == PERM_TOP)
return retval;
all_loads.safe_push (res.second);
}
reply other threads:[~2020-12-14 15:18 UTC|newest]
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