https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120476
--- Comment #2 from chenglulu <chenglulu at loongson dot cn> ---
The following changes can fix this problem:
```
diff --git a/gcc/config/loongarch/loongarch.cc
b/gcc/config/loongarch/loongarch.cc
index ac24c6d768f..53d8caef46d 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -11152,6 +11156,18 @@ loongarch_c_mode_for_suffix (char suffix)
return VOIDmode;
}
+/* Implement TARGET_COMPUTE_PRESSURE_CLASSES. */
+
+static int
+loongarch_compute_pressure_classes (reg_class *classes)
+{
+ int i = 0;
+ classes[i++] = GENERAL_REGS;
+ classes[i++] = FP_REGS;
+ classes[i++] = FCC_REGS;
+ return i;
+}
+
/* Initialize the GCC target structure. */
#undef TARGET_ASM_ALIGNED_HI_OP
#define TARGET_ASM_ALIGNED_HI_OP "\t.half\t"
@@ -11426,6 +11442,9 @@ loongarch_c_mode_for_suffix (char suffix)
#undef TARGET_C_MODE_FOR_SUFFIX
#define TARGET_C_MODE_FOR_SUFFIX loongarch_c_mode_for_suffix
+#undef TARGET_COMPUTE_PRESSURE_CLASSES
+#define TARGET_COMPUTE_PRESSURE_CLASSES loongarch_compute_pressure_classes
+
struct gcc_target targetm = TARGET_INITIALIZER;
#include "gt-loongarch.h"
```
