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 2/8 v9]middle-end slp: fix is_linear_load_p to prevent multiple answers
Date: Mon, 28 Dec 2020 13:36:19 +0000 [thread overview]
Message-ID: <20201228133615.GA19375@arm.com> (raw)
In-Reply-To: <patch-13956-tamar@arm.com>
[-- Attachment #1: Type: text/plain, Size: 1900 bytes --]
Hi All,
This fixes an issue where is_linear_load_p could return the incorrect
permutation kind because it is singe pass.
This arranges the candidates in such a way that there won't be any ambiguity so
that the function can still be linear but give correct values.
Bootstrapped Regtested on aarch64-none-linux-gnu, x86_64-pc-linux-gnu
and no issues.
Ok for master?
Thanks,
Tamar
gcc/ChangeLog:
* tree-vect-slp-patterns.c (is_linear_load_p): Fix ambiguity.
--- inline copy of patch --
diff --git a/gcc/tree-vect-slp-patterns.c b/gcc/tree-vect-slp-patterns.c
index fede88923af8521ee4954c8ae27b0e589f975610..7fd79d91c6ba4ccdbf361307a6105fb7e46aa961 100644
--- a/gcc/tree-vect-slp-patterns.c
+++ b/gcc/tree-vect-slp-patterns.c
@@ -140,32 +140,32 @@ is_linear_load_p (load_permutation_t loads)
unsigned load, i;
complex_perm_kinds_t candidates[4]
- = { PERM_EVENODD
- , PERM_ODDEVEN
- , PERM_ODDODD
+ = { PERM_ODDODD
, PERM_EVENEVEN
+ , PERM_EVENODD
+ , PERM_ODDEVEN
};
int valid_patterns = 4;
- FOR_EACH_VEC_ELT_FROM (loads, i, load, 1)
+ FOR_EACH_VEC_ELT (loads, i, load)
{
- if (candidates[0] != PERM_UNKNOWN && load != i)
+ if (candidates[0] != PERM_UNKNOWN && load != 1)
{
candidates[0] = PERM_UNKNOWN;
valid_patterns--;
}
- if (candidates[1] != PERM_UNKNOWN
- && load != (i % 2 == 0 ? i + 1 : i - 1))
+ if (candidates[1] != PERM_UNKNOWN && load != 0)
{
candidates[1] = PERM_UNKNOWN;
valid_patterns--;
}
- if (candidates[2] != PERM_UNKNOWN && load != 1)
+ if (candidates[2] != PERM_UNKNOWN && load != i)
{
candidates[2] = PERM_UNKNOWN;
valid_patterns--;
}
- if (candidates[3] != PERM_UNKNOWN && load != 0)
+ if (candidates[3] != PERM_UNKNOWN
+ && load != (i % 2 == 0 ? i + 1 : i - 1))
{
candidates[3] = PERM_UNKNOWN;
valid_patterns--;
--
[-- Attachment #2: rb13957.patch --]
[-- Type: text/x-diff, Size: 1402 bytes --]
diff --git a/gcc/tree-vect-slp-patterns.c b/gcc/tree-vect-slp-patterns.c
index fede88923af8521ee4954c8ae27b0e589f975610..7fd79d91c6ba4ccdbf361307a6105fb7e46aa961 100644
--- a/gcc/tree-vect-slp-patterns.c
+++ b/gcc/tree-vect-slp-patterns.c
@@ -140,32 +140,32 @@ is_linear_load_p (load_permutation_t loads)
unsigned load, i;
complex_perm_kinds_t candidates[4]
- = { PERM_EVENODD
- , PERM_ODDEVEN
- , PERM_ODDODD
+ = { PERM_ODDODD
, PERM_EVENEVEN
+ , PERM_EVENODD
+ , PERM_ODDEVEN
};
int valid_patterns = 4;
- FOR_EACH_VEC_ELT_FROM (loads, i, load, 1)
+ FOR_EACH_VEC_ELT (loads, i, load)
{
- if (candidates[0] != PERM_UNKNOWN && load != i)
+ if (candidates[0] != PERM_UNKNOWN && load != 1)
{
candidates[0] = PERM_UNKNOWN;
valid_patterns--;
}
- if (candidates[1] != PERM_UNKNOWN
- && load != (i % 2 == 0 ? i + 1 : i - 1))
+ if (candidates[1] != PERM_UNKNOWN && load != 0)
{
candidates[1] = PERM_UNKNOWN;
valid_patterns--;
}
- if (candidates[2] != PERM_UNKNOWN && load != 1)
+ if (candidates[2] != PERM_UNKNOWN && load != i)
{
candidates[2] = PERM_UNKNOWN;
valid_patterns--;
}
- if (candidates[3] != PERM_UNKNOWN && load != 0)
+ if (candidates[3] != PERM_UNKNOWN
+ && load != (i % 2 == 0 ? i + 1 : i - 1))
{
candidates[3] = PERM_UNKNOWN;
valid_patterns--;
next prev parent reply other threads:[~2020-12-28 13:36 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-28 13:35 [PATCH 1/8 v9]middle-end slp: Support optimizing load distribution Tamar Christina
2020-12-28 13:36 ` Tamar Christina [this message]
2021-01-07 13:17 ` [PATCH 2/8 v9]middle-end slp: fix is_linear_load_p to prevent multiple answers Richard Biener
2020-12-28 13:36 ` [PATCH 3/8 v9]middle-end slp: handle externals correctly in linear_loads_p Tamar Christina
2021-01-07 13:17 ` Richard Biener
2020-12-28 13:37 ` [PATCH 4/8 v9]middle-end slp: upgrade complex add to new format and fix memory leaks Tamar Christina
2021-01-07 13:18 ` Richard Biener
2020-12-28 13:37 ` [PATCH 5/8 v9]middle-end slp: support complex multiply and complex multiply conjugate Tamar Christina
2021-01-08 9:37 ` Richard Biener
2021-01-11 11:01 ` Tamar Christina
2021-01-11 12:04 ` Richard Biener
2020-12-28 13:37 ` [PATCH 6/8 v9]middle-end slp: support complex FMA and complex FMA conjugate Tamar Christina
2021-01-08 9:45 ` Richard Biener
2021-01-08 9:59 ` Tamar Christina
2021-01-08 10:17 ` Richard Biener
2021-01-08 10:21 ` Tamar Christina
2021-01-11 10:24 ` Tamar Christina
2020-12-28 13:38 ` [PATCH 7/8 v9]middle-end slp: support complex FMS and complex FMS conjugate Tamar Christina
2021-01-08 9:49 ` Richard Biener
2021-01-08 10:02 ` Tamar Christina
2020-12-28 13:38 ` [PATCH 8/8 v9]middle-end slp: Add complex operations class to share first match among all matchers Tamar Christina
2021-01-08 9:50 ` Richard Biener
2021-01-07 13:20 ` [PATCH 1/8 v9]middle-end slp: Support optimizing load distribution Richard Biener
2021-01-07 13:25 ` Tamar Christina
2021-01-07 13:36 ` Richard Biener
2021-01-11 11:01 ` Tamar Christina
2021-01-11 13:54 ` Richard Biener
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