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* [gcc r14-8447] LoongArch: Split vec_selects of bottom elements into simple move
@ 2024-01-26 8:22 LuluCheng
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From: LuluCheng @ 2024-01-26 8:22 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:e3a9b77d732de83877a9ed5914e6d429a65e0bf7
commit r14-8447-ge3a9b77d732de83877a9ed5914e6d429a65e0bf7
Author: Jiahao Xu <xujiahao@loongson.cn>
Date: Tue Jan 16 10:23:20 2024 +0800
LoongArch: Split vec_selects of bottom elements into simple move
For below pattern, can be treated as a simple move because floating point
and vector share a common register on loongarch64.
(set (reg/v:SF 32 $f0 [orig:93 res ] [93])
(vec_select:SF (reg:V8SF 32 $f0 [115])
(parallel [
(const_int 0 [0])
])))
gcc/ChangeLog:
* config/loongarch/lasx.md (vec_extract<mode>_0):
New define_insn_and_split patten.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/vect-extract.c: New test.
Diff:
---
gcc/config/loongarch/lasx.md | 15 +++++++++++++++
| 20 ++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/gcc/config/loongarch/lasx.md b/gcc/config/loongarch/lasx.md
index 5d478b92a2f8..e2115ffb884a 100644
--- a/gcc/config/loongarch/lasx.md
+++ b/gcc/config/loongarch/lasx.md
@@ -746,6 +746,21 @@
DONE;
})
+(define_insn_and_split "vec_extract<mode>_0"
+ [(set (match_operand:<UNITMODE> 0 "register_operand" "=f")
+ (vec_select:<UNITMODE>
+ (match_operand:FLASX 1 "register_operand" "f")
+ (parallel [(const_int 0)])))]
+ "ISA_HAS_LSX"
+ "#"
+ "&& reload_completed"
+ [(set (match_dup 0) (match_dup 1))]
+{
+ operands[1] = gen_rtx_REG (<UNITMODE>mode, REGNO (operands[1]));
+}
+ [(set_attr "move_type" "fmove")
+ (set_attr "mode" "<UNITMODE>")])
+
(define_expand "vec_perm<mode>"
[(match_operand:LASX 0 "register_operand")
(match_operand:LASX 1 "register_operand")
--git a/gcc/testsuite/gcc.target/loongarch/vect-extract.c b/gcc/testsuite/gcc.target/loongarch/vect-extract.c
new file mode 100644
index 000000000000..ce126e3a4f19
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/vect-extract.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ffast-math -mlasx -fno-vect-cost-model -fno-unroll-loops" } */
+/* { dg-final { scan-assembler-not "xvpickve.w" } } */
+/* { dg-final { scan-assembler-not "xvpickve.d" } } */
+
+float
+sum_float (float *a, int n) {
+ float res = 0.0;
+ for (int i = 0; i < n; i++)
+ res += a[i];
+ return res;
+}
+
+double
+sum_double (double *a, int n) {
+ double res = 0.0;
+ for (int i = 0; i < n; i++)
+ res += a[i];
+ return res;
+}
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