[PATCH] VECT: Fix ICE on MASK_LEN_{LOAD,STORE} when no LEN recorded[PR110989]

[Juzhe-Zhong <juzhe.zhong@rivai.ai>]

This patch fixes bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110989

This ICE is caused because of this situation:

mask__49.21_99 = vect__17.19_96 == { 0.0, ... };
...
vect__6.24_107 = .MASK_LEN_LOAD (vectp.22_105, 32B, mask__49.21_99, POLY_INT_CST [2, 2], 0);

The MASK_LEN_LOAD is using real MASK which is produced by the EQ comparison wheras the LEN
is the dummy LEN which is the vectorization factor.

In this situation, we didn't enter 'vect_record_loop_len' since there is no LEN loop control.
Then 'LOOP_VINFO_RGROUP_IV_TYPE' is not suitable type for 'build_int_cst' used for producing
LEN argument for 'MASK_LEN_LOAD', so use sizetype instead which is perfectly matching
RVV length requirement.

        PR middle-end/110989

gcc/ChangeLog:

        * tree-vect-stmts.cc (vectorizable_store): Replace iv_type with sizetype.
        (vectorizable_load): Ditto.

gcc/testsuite/ChangeLog:

        * gcc.target/riscv/rvv/autovec/pr110989.c: New test.

---
 gcc/testsuite/gcc.target/riscv/rvv/autovec/pr110989.c | 11 +++++++++++
 gcc/tree-vect-stmts.cc                                |  7 ++-----
 2 files changed, 13 insertions(+), 5 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/pr110989.c

diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr110989.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr110989.c
new file mode 100644
index 00000000000..cf3b247e604
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr110989.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv -mabi=lp64d --param=riscv-autovec-preference=scalable -Ofast" } */
+
+int a, b, c;
+double *d;
+void e() {
+  double f;
+  for (; c; c++, d--)
+    f = *d ?: *(&a + c);
+  b = f;
+}
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index 398fbe945e5..e0e2083d022 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -9126,9 +9126,8 @@ vectorizable_store (vec_info *vinfo,
 		    {
 		      /* Pass VF value to 'len' argument of
 		         MASK_LEN_STORE if LOOP_LENS is invalid.  */
-		      tree iv_type = LOOP_VINFO_RGROUP_IV_TYPE (loop_vinfo);
 		      final_len
-			= build_int_cst (iv_type,
+			= build_int_cst (sizetype,
 					 TYPE_VECTOR_SUBPARTS (vectype));
 		    }
 		  if (!final_mask)
@@ -10713,10 +10712,8 @@ vectorizable_load (vec_info *vinfo,
 			  {
 			    /* Pass VF value to 'len' argument of
 			       MASK_LEN_LOAD if LOOP_LENS is invalid.  */
-			    tree iv_type
-			      = LOOP_VINFO_RGROUP_IV_TYPE (loop_vinfo);
 			    final_len
-			      = build_int_cst (iv_type,
+			      = build_int_cst (sizetype,
 					       TYPE_VECTOR_SUBPARTS (vectype));
 			  }
 			if (!final_mask)
-- 
2.36.3