The psABI allows using s9 as an alias of r22.
gcc/ChangeLog:
* config/loongarch/loongarch.h (ADDITIONAL_REGISTER_NAMES): Add
s9 as an alias of r22.
---
v1 -> v2: Add a test case.
Ok for trunk?
gcc/config/loongarch/loongarch.h | 1 +
gcc/testsuite/gcc.target/loongarch/regname-fp-s9.c | 3 +++
2 files changed, 4 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/loongarch/regname-fp-s9.c
diff --git a/gcc/config/loongarch/loongarch.h b/gcc/config/loongarch/loongarch.h
index 8b453ab3140..bf2351f0968 100644
--- a/gcc/config/loongarch/loongarch.h
+++ b/gcc/config/loongarch/loongarch.h
@@ -931,6 +931,7 @@ typedef struct {
{ "t8", 20 + GP_REG_FIRST }, \
{ "x", 21 + GP_REG_FIRST }, \
{ "fp", 22 + GP_REG_FIRST }, \
+ { "s9", 22 + GP_REG_FIRST }, \
{ "s0", 23 + GP_REG_FIRST }, \
{ "s1", 24 + GP_REG_FIRST }, \
{ "s2", 25 + GP_REG_FIRST }, \
diff --git a/gcc/testsuite/gcc.target/loongarch/regname-fp-s9.c
b/gcc/testsuite/gcc.target/loongarch/regname-fp-s9.c
new file mode 100644
index 00000000000..d2e3b80f83c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/regname-fp-s9.c
@@ -0,0 +1,3 @@
+/* { dg-do compile } */
+register long s9 asm("s9"); /* { dg-note "conflicts with 's9'" } */
+register long fp asm("fp"); /* { dg-warning "register of 'fp' used for
multiple global register variables" } */
--
2.44.0
