https://gcc.gnu.org/g:e8a57884ad4898fdec5c13a8933d73bcbaf06099
commit r15-6755-ge8a57884ad4898fdec5c13a8933d73bcbaf06099
Author: chenxiaolong <chenxiaol...@loongson.cn>
Date: Tue Jan 7 21:04:51 2025 +0800
LoongArch: Opitmize the cost of vec_construct.
When analyzing 525 on LoongArch architecture, it was found that the
for loop of hotspot function x264_pixel_satd_8x4 could not be quantized
256-bit due to the cost of vec_construct setting. After re-adjusting
vec_construct, the performance of 525 program was improved by 16.57%.
It was found that this function can be vectorized on the aarch64 and
x86 architectures, see [PR98138].
Co-Authored-By: Deng Jianbo <dengjia...@loongson.cn>.
gcc/ChangeLog:
* config/loongarch/loongarch.cc
(loongarch_builtin_vectorization_cost): Modify the
construction cost of the vec_construct vector.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/vect-slp-two-operator.c: New test.
Diff:
---
gcc/config/loongarch/loongarch.cc | 6 ++--
.../gcc.target/loongarch/vect-slp-two-operator.c | 38 ++++++++++++++++++++++
2 files changed, 41 insertions(+), 3 deletions(-)
diff --git a/gcc/config/loongarch/loongarch.cc
b/gcc/config/loongarch/loongarch.cc
index d506354c48a0..24c19031026a 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -4127,10 +4127,10 @@ loongarch_builtin_vectorization_cost (enum
vect_cost_for_stmt type_of_cost,
case vec_construct:
elements = TYPE_VECTOR_SUBPARTS (vectype);
- if (ISA_HAS_LASX)
- return elements + 1;
+ if (LASX_SUPPORTED_MODE_P (mode) && !LSX_SUPPORTED_MODE_P (mode))
+ return elements / 2 + 3;
else
- return elements;
+ return elements / 2 + 1;
default:
gcc_unreachable ();
diff --git a/gcc/testsuite/gcc.target/loongarch/vect-slp-two-operator.c
b/gcc/testsuite/gcc.target/loongarch/vect-slp-two-operator.c
new file mode 100644
index 000000000000..43b46759902b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/vect-slp-two-operator.c
@@ -0,0 +1,38 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mlasx -ftree-vectorize -fdump-tree-vect
-fdump-tree-vect-details" } */
+
+typedef unsigned char uint8_t;
+typedef unsigned int uint32_t;
+
+#define HADAMARD4(d0, d1, d2, d3, s0, s1, s2, s3) \
+ { \
+ int t0 = s0 + s1; \
+ int t1 = s0 - s1; \
+ int t2 = s2 + s3; \
+ int t3 = s2 - s3; \
+ d0 = t0 + t2; \
+ d1 = t1 + t3; \
+ d2 = t0 - t2; \
+ d3 = t1 - t3; \
+ }
+
+void sink (uint32_t tmp[4][4]);
+
+void
+x264_pixel_satd_8x4 (uint8_t *pix1, int i_pix1, uint8_t *pix2, int i_pix2)
+{
+ uint32_t tmp[4][4];
+ int sum = 0;
+ for (int i = 0; i < 4; i++, pix1 += i_pix1, pix2 += i_pix2)
+ {
+ uint32_t a0 = (pix1[0] - pix2[0]) + ((pix1[4] - pix2[4]) << 16);
+ uint32_t a1 = (pix1[1] - pix2[1]) + ((pix1[5] - pix2[5]) << 16);
+ uint32_t a2 = (pix1[2] - pix2[2]) + ((pix1[6] - pix2[6]) << 16);
+ uint32_t a3 = (pix1[3] - pix2[3]) + ((pix1[7] - pix2[7]) << 16);
+ HADAMARD4 (tmp[i][0], tmp[i][1], tmp[i][2], tmp[i][3], a0, a1, a2, a3);
+ }
+ sink (tmp);
+}
+
+/* { dg-final { scan-tree-dump "vectorizing stmts using SLP" "vect" } } */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */
