在 2023/9/6 下午7:10, Xi Ruoyao 写道:
On Wed, 2023-09-06 at 18:43 +0800, Xiaolong Chen wrote:
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/strict-align.c: New test.
A question: is there really a CPU model with LSX/LASX but without
unaligned access support? If not I think we'd just reject -mstrict-
align -mlsx.
Currently Glibc assumes if LSX is available then unaligned access must
be available too.
This is not a question of support or unsupport, the original intention
is to need to naturally align memory access to improve performance after
enabling LSX, but this part of the code has not been ported to the main
branch, so we will submit this test example after adding the
corresponding function.
Thanks!
---
gcc/testsuite/gcc.target/loongarch/strict-align.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/loongarch/strict-align.c
diff --git a/gcc/testsuite/gcc.target/loongarch/strict-align.c
b/gcc/testsuite/gcc.target/loongarch/strict-align.c
new file mode 100644
index 00000000000..bcad2b84f68
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/strict-align.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-Ofast -mstrict-align -mlasx" } */
+/* { dg-final { scan-assembler-not "vfadd.s" } } */
+
+void
+foo (float* restrict x, float* restrict y)
+{
+ x[0] = x[0] + y[0];
+ x[1] = x[1] + y[1];
+ x[2] = x[2] + y[2];
+ x[3] = x[3] + y[3];
+}
+
