From: Li Xu <xuli1@eswincomputing.com>
To: gcc-patches@gcc.gnu.org
Cc: kito.cheng@gmail.com, palmer@dabbelt.com, juzhe.zhong@rivai.ai,
xuli <xuli1@eswincomputing.com>
Subject: [PATCH] RISC-V: Implement -mmemcpy-strategy= options[PR112537]
Date: Fri, 17 Nov 2023 05:12:32 +0000 [thread overview]
Message-ID: <20231117051232.10396-1-xuli1@eswincomputing.com> (raw)
From: xuli <xuli1@eswincomputing.com>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112537
-mmemcpy-strategy=[auto|libcall|scalar|vector]
auto: Current status, use scalar or vector instructions.
libcall: Always use a library call.
scalar: Only use scalar instructions.
vector: Only use vector instructions.
PR target/112537
gcc/ChangeLog:
* config/riscv/riscv-opts.h (enum riscv_stringop_strategy_enum): Strategy enum.
* config/riscv/riscv-string.cc (riscv_expand_block_move): Disabled based on options.
(expand_block_move): Ditto.
* config/riscv/riscv.opt: Add -mmemcpy-strategy=.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/rvv/base/cpymem-strategy-1.c: New test.
* gcc.target/riscv/rvv/base/cpymem-strategy-2.c: New test.
* gcc.target/riscv/rvv/base/cpymem-strategy-3.c: New test.
* gcc.target/riscv/rvv/base/cpymem-strategy-4.c: New test.
* gcc.target/riscv/rvv/base/cpymem-strategy-5.c: New test.
* gcc.target/riscv/rvv/base/cpymem-strategy.h: New test.
---
gcc/config/riscv/riscv-opts.h | 12 +++++++++++
gcc/config/riscv/riscv-string.cc | 7 ++++++-
gcc/config/riscv/riscv.opt | 20 +++++++++++++++++++
.../riscv/rvv/base/cpymem-strategy-1.c | 6 ++++++
.../riscv/rvv/base/cpymem-strategy-2.c | 6 ++++++
.../riscv/rvv/base/cpymem-strategy-3.c | 6 ++++++
.../riscv/rvv/base/cpymem-strategy-4.c | 6 ++++++
.../riscv/rvv/base/cpymem-strategy-5.c | 6 ++++++
.../riscv/rvv/base/cpymem-strategy.h | 12 +++++++++++
9 files changed, 80 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-1.c
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-2.c
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-3.c
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-4.c
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-5.c
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy.h
diff --git a/gcc/config/riscv/riscv-opts.h b/gcc/config/riscv/riscv-opts.h
index 532b1b6b84a..0b242f068e1 100644
--- a/gcc/config/riscv/riscv-opts.h
+++ b/gcc/config/riscv/riscv-opts.h
@@ -102,6 +102,18 @@ enum riscv_entity
MAX_RISCV_ENTITIES
};
+/* RISC-V stringop strategy. */
+enum riscv_stringop_strategy_enum {
+ /* Use scalar or vector instructions. */
+ USE_AUTO,
+ /* Always use a library call. */
+ USE_LIBCALL,
+ /* Only use scalar instructions. */
+ USE_SCALAR,
+ /* Only use vector instructions. */
+ USE_VECTOR
+};
+
#define TARGET_ZICOND_LIKE (TARGET_ZICOND || (TARGET_XVENTANACONDOPS && TARGET_64BIT))
/* Bit of riscv_zvl_flags will set contintuly, N-1 bit will set if N-bit is
diff --git a/gcc/config/riscv/riscv-string.cc b/gcc/config/riscv/riscv-string.cc
index 57e8ad698d7..3b5e05e2c44 100644
--- a/gcc/config/riscv/riscv-string.cc
+++ b/gcc/config/riscv/riscv-string.cc
@@ -710,6 +710,10 @@ riscv_block_move_loop (rtx dest, rtx src, unsigned HOST_WIDE_INT length,
bool
riscv_expand_block_move (rtx dest, rtx src, rtx length)
{
+ if (riscv_memcpy_strategy == USE_LIBCALL
+ || riscv_memcpy_strategy == USE_VECTOR)
+ return false;
+
if (CONST_INT_P (length))
{
unsigned HOST_WIDE_INT hwi_length = UINTVAL (length);
@@ -773,7 +777,8 @@ expand_block_move (rtx dst_in, rtx src_in, rtx length_in)
bnez a2, loop # Any more?
ret # Return
*/
- if (!TARGET_VECTOR)
+ if (!TARGET_VECTOR || riscv_memcpy_strategy == USE_LIBCALL
+ || riscv_memcpy_strategy == USE_SCALAR)
return false;
HOST_WIDE_INT potential_ew
= (MIN (MIN (MEM_ALIGN (src_in), MEM_ALIGN (dst_in)), BITS_PER_WORD)
diff --git a/gcc/config/riscv/riscv.opt b/gcc/config/riscv/riscv.opt
index 70d78151cee..4f3ce2233b2 100644
--- a/gcc/config/riscv/riscv.opt
+++ b/gcc/config/riscv/riscv.opt
@@ -527,3 +527,23 @@ Target Var(TARGET_ADJUST_LMUL_COST) Init(0)
Target Undocumented Bool Var(riscv_vector_abi) Init(0)
Enable the use of vector registers for function arguments and return value.
This is an experimental switch and may be subject to change in the future.
+
+Enum
+Name(riscv_stringop_strategy) Type(enum riscv_stringop_strategy_enum)
+Valid arguments to -mmemcpy-strategy=:
+
+EnumValue
+Enum(riscv_stringop_strategy) String(auto) Value(USE_AUTO)
+
+EnumValue
+Enum(riscv_stringop_strategy) String(libcall) Value(USE_LIBCALL)
+
+EnumValue
+Enum(riscv_stringop_strategy) String(scalar) Value(USE_SCALAR)
+
+EnumValue
+Enum(riscv_stringop_strategy) String(vector) Value(USE_VECTOR)
+
+mmemcpy-strategy=
+Target RejectNegative Joined Enum(riscv_stringop_strategy) Var(riscv_memcpy_strategy) Init(USE_AUTO)
+Specify memcpy expansion strategy.
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-1.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-1.c
new file mode 100644
index 00000000000..ae49706dca5
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-1.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gcv -mabi=ilp32d -mmemcpy-strategy=libcall" } */
+
+#include "cpymem-strategy.h"
+
+/* { dg-final { scan-assembler-times {call\tmemcpy} 2 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-2.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-2.c
new file mode 100644
index 00000000000..73ffc5783d0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-2.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=rv32gcv -mabi=ilp32d -mmemcpy-strategy=scalar" } */
+
+#include "cpymem-strategy.h"
+
+/* { dg-final { scan-assembler-times {call\tmemcpy} 1 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-3.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-3.c
new file mode 100644
index 00000000000..44f5f783962
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-3.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gcv -mabi=ilp32d -mmemcpy-strategy=vector" } */
+
+#include "cpymem-strategy.h"
+
+/* { dg-final { scan-assembler-times {v[ls]+e[0-9]+\.v\tv[0-9]+\,0\([a-z0-9]+\)} 4 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-4.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-4.c
new file mode 100644
index 00000000000..8056895334a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-4.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gcv -mabi=ilp32d -mmemcpy-strategy=auto" } */
+
+#include "cpymem-strategy.h"
+
+/* { dg-final { scan-assembler-times {v[ls]+e[0-9]+\.v\tv[0-9]+\,0\([a-z0-9]+\)} 4 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-5.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-5.c
new file mode 100644
index 00000000000..82ecab04a40
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy-5.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gc -mabi=ilp32d -mmemcpy-strategy=vector" } */
+
+#include "cpymem-strategy.h"
+
+/* { dg-final { scan-assembler-times {call\tmemcpy} 2 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy.h b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy.h
new file mode 100644
index 00000000000..700d224c01f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cpymem-strategy.h
@@ -0,0 +1,12 @@
+typedef struct { unsigned char a[56]; } a56;
+typedef struct { int b[32]; } b32;
+
+void f1 (a56 *v1, a56 *v2)
+{
+ *v1 = *v2;
+}
+
+void f2 (b32 *v1, b32 *v2)
+{
+ *v1 = *v2;
+}
--
2.17.1
next reply other threads:[~2023-11-17 5:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-17 5:12 Li Xu [this message]
2023-11-19 21:42 ` Jeff Law
2023-11-20 1:09 ` Li Xu
2023-11-20 1:55 ` juzhe.zhong
2023-11-20 2:51 ` Li Xu
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