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https://gcc.gnu.org/PR97236
From 1ab88985631dd2c5a5e3b5c0dce47cf8b6ed2f82 Mon Sep 17 00:00:00 2001
From: Matthias Klose <doko@ubuntu.com>
Date: Tue, 6 Oct 2020 13:41:37 +0200
Subject: [PATCH] Backport fix for PR/tree-optimization/97236 - fix bad use of
VMAT_CONTIGUOUS
This avoids using VMAT_CONTIGUOUS with single-element interleaving
when using V1mode vectors. Instead keep VMAT_ELEMENTWISE but
continue to avoid load-lanes and gathers.
2020-10-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/97236
* tree-vect-stmts.c (get_group_load_store_type): Keep
VMAT_ELEMENTWISE for single-element vectors.
* gcc.dg/vect/pr97236.c: New testcase.
---
gcc/testsuite/gcc.dg/vect/pr97236.c | 43 +++++++++++++++++++++++++++++
gcc/tree-vect-stmts.c | 20 ++++++--------
2 files changed, 52 insertions(+), 11 deletions(-)
create mode 100644 gcc/testsuite/gcc.dg/vect/pr97236.c
diff --git a/gcc/testsuite/gcc.dg/vect/pr97236.c b/gcc/testsuite/gcc.dg/vect/pr97236.c
new file mode 100644
index 00000000000..9d3dc20d953
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr97236.c
@@ -0,0 +1,43 @@
+typedef unsigned char __uint8_t;
+typedef __uint8_t uint8_t;
+typedef struct plane_t {
+ uint8_t *p_pixels;
+ int i_lines;
+ int i_pitch;
+} plane_t;
+
+typedef struct {
+ plane_t p[5];
+} picture_t;
+
+#define N 4
+
+void __attribute__((noipa))
+picture_Clone(picture_t *picture, picture_t *res)
+{
+ for (int i = 0; i < N; i++) {
+ res->p[i].p_pixels = picture->p[i].p_pixels;
+ res->p[i].i_lines = picture->p[i].i_lines;
+ res->p[i].i_pitch = picture->p[i].i_pitch;
+ }
+}
+
+int
+main()
+{
+ picture_t aaa, bbb;
+ uint8_t pixels[10] = {1, 1, 1, 1, 1, 1, 1, 1};
+
+ for (unsigned i = 0; i < N; i++)
+ aaa.p[i].p_pixels = pixels;
+
+ picture_Clone (&aaa, &bbb);
+
+ uint8_t c = 0;
+ for (unsigned i = 0; i < N; i++)
+ c += bbb.p[i].p_pixels[0];
+
+ if (c != N)
+ __builtin_abort ();
+ return 0;
+}
diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index 9ace345fc5e..d8b2ff3d6ee 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -2413,25 +2413,23 @@ get_group_load_store_type (stmt_vec_info stmt_info, tree vectype, bool slp,
/* First cope with the degenerate case of a single-element
vector. */
if (known_eq (TYPE_VECTOR_SUBPARTS (vectype), 1U))
- *memory_access_type = VMAT_CONTIGUOUS;
+ ;
/* Otherwise try using LOAD/STORE_LANES. */
- if (*memory_access_type == VMAT_ELEMENTWISE
- && (vls_type == VLS_LOAD
- ? vect_load_lanes_supported (vectype, group_size, masked_p)
- : vect_store_lanes_supported (vectype, group_size,
- masked_p)))
+ else if (vls_type == VLS_LOAD
+ ? vect_load_lanes_supported (vectype, group_size, masked_p)
+ : vect_store_lanes_supported (vectype, group_size,
+ masked_p))
{
*memory_access_type = VMAT_LOAD_STORE_LANES;
overrun_p = would_overrun_p;
}
/* If that fails, try using permuting loads. */
- if (*memory_access_type == VMAT_ELEMENTWISE
- && (vls_type == VLS_LOAD
- ? vect_grouped_load_supported (vectype, single_element_p,
- group_size)
- : vect_grouped_store_supported (vectype, group_size)))
+ else if (vls_type == VLS_LOAD
+ ? vect_grouped_load_supported (vectype, single_element_p,
+ group_size)
+ : vect_grouped_store_supported (vectype, group_size))
{
*memory_access_type = VMAT_CONTIGUOUS_PERMUTE;
overrun_p = would_overrun_p;
--
2.30.1
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