From: Richard Ball <richard.ball@arm.com>
To: gcc-patches@gcc.gnu.org
Cc: richard.earnshaw@arm.com, richard.sandiford@arm.com,
marcus.shawcroft@arm.com, kyrylo.tkachov@arm.com
Subject: [PATCH] aarch64: Replace manual swapping idiom with std::swap in aarch64.cc
Date: Fri, 15 Jul 2022 15:53:41 +0100 [thread overview]
Message-ID: <cf6b3c07-ef80-a8e9-ca7c-e935a7937338@arm.com> (raw)
Replace manual swapping idiom with std::swap in aarch64.cc
gcc/config/aarch64/aarch64.cc has a few manual swapping idioms of the form:
x = in0, in0 = in1, in1 = x;
The preferred way is using the standard:
std::swap (in0, in1);
We should just fix these to use std::swap.
This will also allow us to eliminate the x temporary rtx.
gcc/ChangeLog:
* config/aarch64/aarch64.cc (aarch64_evpc_trn): Use std:swap.
(aarch64_evpc_uzp): Likewise.
(aarch64_evpc_zip): Likewise.
---
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index
d049f9a9819628a73bfd57114c3b89d848da7d9c..b75a032c2f2c55d71bcb6b4b6ef1bd7f42a97235
100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -23498,7 +23498,7 @@ aarch64_evpc_trn (struct expand_vec_perm_d *d)
{
HOST_WIDE_INT odd;
poly_uint64 nelt = d->perm.length ();
- rtx out, in0, in1, x;
+ rtx out, in0, in1;
machine_mode vmode = d->vmode;
if (GET_MODE_UNIT_SIZE (vmode) > 8)
@@ -23522,7 +23522,7 @@ aarch64_evpc_trn (struct expand_vec_perm_d *d)
at the head of aarch64-sve.md for details. */
if (BYTES_BIG_ENDIAN && d->vec_flags == VEC_ADVSIMD)
{
- x = in0, in0 = in1, in1 = x;
+ std::swap (in0, in1);
odd = !odd;
}
out = d->target;
@@ -23592,7 +23592,7 @@ static bool
aarch64_evpc_uzp (struct expand_vec_perm_d *d)
{
HOST_WIDE_INT odd;
- rtx out, in0, in1, x;
+ rtx out, in0, in1;
machine_mode vmode = d->vmode;
if (GET_MODE_UNIT_SIZE (vmode) > 8)
@@ -23615,7 +23615,7 @@ aarch64_evpc_uzp (struct expand_vec_perm_d *d)
at the head of aarch64-sve.md for details. */
if (BYTES_BIG_ENDIAN && d->vec_flags == VEC_ADVSIMD)
{
- x = in0, in0 = in1, in1 = x;
+ std::swap (in0, in1);
odd = !odd;
}
out = d->target;
@@ -23631,7 +23631,7 @@ aarch64_evpc_zip (struct expand_vec_perm_d *d)
{
unsigned int high;
poly_uint64 nelt = d->perm.length ();
- rtx out, in0, in1, x;
+ rtx out, in0, in1;
machine_mode vmode = d->vmode;
if (GET_MODE_UNIT_SIZE (vmode) > 8)
@@ -23656,7 +23656,7 @@ aarch64_evpc_zip (struct expand_vec_perm_d *d)
at the head of aarch64-sve.md for details. */
if (BYTES_BIG_ENDIAN && d->vec_flags == VEC_ADVSIMD)
{
- x = in0, in0 = in1, in1 = x;
+ std::swap (in0, in1);
high = !high;
}
out = d->target;
next reply other threads:[~2022-07-15 14:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-15 14:53 Richard Ball [this message]
2022-07-18 10:30 ` Richard Sandiford
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