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* [Bug target/112538] New: [RISC-V] Failed to disable V-ext autovectorization using the '--param riscv-autovec-preference=none'
@ 2023-11-15 4:41 mumuxi_ll at outlook dot com
2023-11-15 5:23 ` [Bug target/112538] " juzhe.zhong at rivai dot ai
2023-11-15 5:53 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: mumuxi_ll at outlook dot com @ 2023-11-15 4:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112538
Bug ID: 112538
Summary: [RISC-V] Failed to disable V-ext autovectorization
using the '--param riscv-autovec-preference=none'
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: mumuxi_ll at outlook dot com
Target Milestone: ---
Here is my test case:
```
#include <string.h>
typedef char Str_30 [31];
Str_30 Str_2_Loc;
void foo(void)
{
strcpy(Str_2_Loc, "DHRYSTONE PROGRAM");
}
```
Compiled with riscv64-unknown-elf-gcc -march=rv32imafdc_zve32f -mabi=ilp32d -S
rvv_autovec_bug.c --param riscv-autovec-preference=none
The result is:
.string "DHRYSTONE PROGRAM"
.text
.align 1
.globl foo
.type foo, @function
foo:
addi sp,sp,-16
sw ra,12(sp)
sw s0,8(sp)
addi s0,sp,16
lui a5,%hi(Str_2_Loc)
addi a3,a5,%lo(Str_2_Loc)
lui a5,%hi(.LC0)
addi a4,a5,%lo(.LC0)
mv a5,a3
vsetivli zero,9,e16,m8,ta,ma
vle16.v v8,0(a4)
vsetivli zero,9,e16,m8,ta,ma
vse16.v v8,0(a5)
nop
lw ra,12(sp)
lw s0,8(sp)
addi sp,sp,16
jr ra
It still generates the v-ext instructions automatically, which seems that the
"--param riscv-autovec-preference=none" did not work.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/112538] [RISC-V] Failed to disable V-ext autovectorization using the '--param riscv-autovec-preference=none'
2023-11-15 4:41 [Bug target/112538] New: [RISC-V] Failed to disable V-ext autovectorization using the '--param riscv-autovec-preference=none' mumuxi_ll at outlook dot com
@ 2023-11-15 5:23 ` juzhe.zhong at rivai dot ai
2023-11-15 5:53 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: juzhe.zhong at rivai dot ai @ 2023-11-15 5:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112538
JuzheZhong <juzhe.zhong at rivai dot ai> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |juzhe.zhong at rivai dot ai
--- Comment #1 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
Duplicate bug of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112537
It generates vector codes since it is lower int __builtin_memcpy
https://godbolt.org/z/f36feoW6x
Current expanding memcpy into RVV by default as long as TARGET_VECTOR is true.
More details see expand_block_move in riscv-string.cc
Maybe you need to add
if (!flag_tree_vectorize)
return false;
in expand_block_move .
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/112538] [RISC-V] Failed to disable V-ext autovectorization using the '--param riscv-autovec-preference=none'
2023-11-15 4:41 [Bug target/112538] New: [RISC-V] Failed to disable V-ext autovectorization using the '--param riscv-autovec-preference=none' mumuxi_ll at outlook dot com
2023-11-15 5:23 ` [Bug target/112538] " juzhe.zhong at rivai dot ai
@ 2023-11-15 5:53 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-11-15 5:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112538
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 112537 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-11-15 4:41 [Bug target/112538] New: [RISC-V] Failed to disable V-ext autovectorization using the '--param riscv-autovec-preference=none' mumuxi_ll at outlook dot com
2023-11-15 5:23 ` [Bug target/112538] " juzhe.zhong at rivai dot ai
2023-11-15 5:53 ` pinskia at gcc dot gnu.org
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