[PATCH 2/9] LoongArch: Fix default ISA setting

[Jiajie Chen <c@jia.je>]

When loongarch_arch_target is called, la_target has not been
initialized, thus the macro LARCH_ACTUAL_ARCH always equals to zero.

This commit fixes by expanding the macro and reading the latest value.
It permits -march=loongarch64 when the default target is loongarch32 and
vice versa.

gcc/ChangeLog:

	* config/loongarch/loongarch-opts.cc (loongarch_config_target):
	  Fix -march detection.

gcc/testsuite/ChangeLog:

	* gcc.target/loongarch/arch-1.c: New test.
	* gcc.target/loongarch/arch-2.c: New test.
	* gcc.target/loongarch/arch-3.c: New test.
---
 gcc/config/loongarch/loongarch-opts.cc      | 5 ++++-
 gcc/testsuite/gcc.target/loongarch/arch-1.c | 5 +++++
 gcc/testsuite/gcc.target/loongarch/arch-2.c | 5 +++++
 gcc/testsuite/gcc.target/loongarch/arch-3.c | 6 ++++++
 4 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.target/loongarch/arch-1.c
 create mode 100644 gcc/testsuite/gcc.target/loongarch/arch-2.c
 create mode 100644 gcc/testsuite/gcc.target/loongarch/arch-3.c

diff --git a/gcc/config/loongarch/loongarch-opts.cc b/gcc/config/loongarch/loongarch-opts.cc
index 9fc0bbbcb6e..29c0c4468bb 100644
--- a/gcc/config/loongarch/loongarch-opts.cc
+++ b/gcc/config/loongarch/loongarch-opts.cc
@@ -246,7 +246,10 @@ loongarch_config_target (struct loongarch_target *target,
 config_target_isa:
 
   /* Get default ISA from "-march" or its default value.  */
-  t.isa = loongarch_cpu_default_isa[LARCH_ACTUAL_ARCH];
+  if (t.cpu_arch == TARGET_ARCH_NATIVE)
+    t.isa = loongarch_cpu_default_isa[t.cpu_native];
+  else
+    t.isa = loongarch_cpu_default_isa[t.cpu_arch];
 
   /* Apply incremental changes.  */
   /* "-march=native" overrides the default FPU type.  */
diff --git a/gcc/testsuite/gcc.target/loongarch/arch-1.c b/gcc/testsuite/gcc.target/loongarch/arch-1.c
new file mode 100644
index 00000000000..379036ec76f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/arch-1.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-march=loongarch64 -mabi=lp64d" } */
+int foo()
+{
+}
diff --git a/gcc/testsuite/gcc.target/loongarch/arch-2.c b/gcc/testsuite/gcc.target/loongarch/arch-2.c
new file mode 100644
index 00000000000..55d646902a6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/arch-2.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-march=loongarch32 -mabi=ilp32d" } */
+int foo()
+{
+}
diff --git a/gcc/testsuite/gcc.target/loongarch/arch-3.c b/gcc/testsuite/gcc.target/loongarch/arch-3.c
new file mode 100644
index 00000000000..543b93883bd
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/arch-3.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-march=loongarch64 -mabi=ilp32d" } */
+int foo()
+{
+}
+/* { dg-error "unable to implement ABI 'ilp32d' with instruction set 'la64/fpu64'" "" { target *-*-* } 0 } */
-- 
2.41.0