[PATCH v2] LoongArch: Allow s9 as a register alias

[Xi Ruoyao]

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 000..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

Re: [PATCH v2] LoongArch: Allow s9 as a register alias

[chenglulu]

在 2024/3/5 下午7:50, Xi Ruoyao 写道:

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?

Ok. Thanks!


  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 000..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" } */