[PATCH] LoongArch: Fix ICE caused by function add_stmt_cost[PR121542].

[Lulu Cheng]

        PR target/121542

gcc/ChangeLog:

        * config/loongarch/loongarch.cc
        (loongarch_vector_costs::add_stmt_cost): When using vectype,
        first determine whether it is NULL.

gcc/testsuite/ChangeLog:

        * gcc.target/loongarch/pr121542.c: New test.

---
 gcc/config/loongarch/loongarch.cc             |  1 +
 gcc/testsuite/gcc.target/loongarch/pr121542.c | 54 +++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/loongarch/pr121542.c

diff --git a/gcc/config/loongarch/loongarch.cc 
b/gcc/config/loongarch/loongarch.cc
index 3b62ed9cfb9..e2f8e06c1b7 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -4388,6 +4388,7 @@ loongarch_vector_costs::add_stmt_cost (int count, 
vect_cost_for_stmt kind,
            break;
          }
       else if (TARGET_RECIP_VEC_DIV
+              && vectype
               && gimple_code (stmt_info->stmt) == GIMPLE_ASSIGN)
        {
          machine_mode mode = TYPE_MODE (vectype);
diff --git a/gcc/testsuite/gcc.target/loongarch/pr121542.c 
b/gcc/testsuite/gcc.target/loongarch/pr121542.c
new file mode 100644
index 00000000000..51a5e3c4480
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/pr121542.c
@@ -0,0 +1,54 @@
+/* { dg-do compile } */
+/* { dg-options "-mrecip=all  -mfrecipe -mabi=lp64d -march=loongarch64 
-mfpu=64 -msimd=lasx -Ofast" } */
+
+typedef long unsigned int STRLEN;
+typedef struct sv SV;
+struct sv
+{
+  void *sv_any;
+  unsigned int sv_refcnt;
+  unsigned int sv_flags;
+};
+typedef struct xpv XPV;
+struct xpv
+{
+  char *xpv_pv;
+  STRLEN xpv_cur;
+  STRLEN xpv_len;
+};
+typedef unsigned long UV;
+extern char *PL_bufend;
+extern char *d;
+SV *Perl_newSV (STRLEN len);
+
+char *
+S_scan_const (char *start)
+{
+  register char *send = PL_bufend;
+  SV *sv = Perl_newSV (send - start);
+  register char *s = start;
+  UV uv;
+
+  while (s < send)
+    {
+      if (!(((UV)(uv)) < 0x80))
+        {
+          int hicount = 0;
+          unsigned char *c;
+          for (c = (unsigned char *)((XPV *)(sv)->sv_any)->xpv_pv;
+               c < (unsigned char *)d; c++)
+            {
+              if (!(((UV)(*c)) < 0x80))
+                {
+                  hicount++;
+                }
+            }
+          d += hicount;
+          *d++ = (char)uv;
+        }
+
+      s++;
+    }
+
+  return s;
+}
-- 
2.34.1