diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc
index d72b256df51..5c9a33c14f7 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -917,8 +917,12 @@ loongarch_compute_frame_info (void)
   frame->frame_pointer_offset = offset;
   /* Next are the callee-saved FPRs.  */
   if (frame->fmask)
-    offset += LARCH_STACK_ALIGN (num_f_saved * UNITS_PER_FP_REG);
-  frame->fp_sp_offset = offset - UNITS_PER_FP_REG;
+    {
+      offset += LARCH_STACK_ALIGN (num_f_saved * UNITS_PER_FP_REG);
+      frame->fp_sp_offset = offset - UNITS_PER_FP_REG;
+    }
+  else
+    frame->fp_sp_offset = offset;
   /* Next are the callee-saved GPRs.  */
   if (frame->mask)
     {
@@ -931,8 +935,10 @@ loongarch_compute_frame_info (void)
 	frame->save_libcall_adjustment = x_save_size;
 
       offset += x_save_size;
+      frame->gp_sp_offset = offset - UNITS_PER_WORD;
     }
-  frame->gp_sp_offset = offset - UNITS_PER_WORD;
+  else
+    frame->gp_sp_offset = offset;
   /* The hard frame pointer points above the callee-saved GPRs.  */
   frame->hard_frame_pointer_offset = offset;
   /* Above the hard frame pointer is the callee-allocated varags save area.  */
diff --git a/gcc/testsuite/gcc.target/loongarch/prolog-opt.c b/gcc/testsuite/gcc.target/loongarch/prolog-opt.c
new file mode 100644
index 00000000000..0470a1f1eee
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/prolog-opt.c
@@ -0,0 +1,15 @@
+/* Test that LoongArch backend stack drop operation optimized.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O2 -mabi=lp64d" } */
+/* { dg-final { scan-assembler "addi.d\t\\\$r3,\\\$r3,-16" } } */
+
+extern int printf (char *, ...);
+
+int main()
+{
+  char buf[1024 * 12];
+  printf ("%p\n", buf);
+  return 0;
+}
+