[gcc r14-7242] RISC-V: Remove m_num_vector_iterations[NFC]

[Lehua Ding]

https://gcc.gnu.org/g:e037a0fa040ee1a3500c8523f3ffa713069ac283

commit r14-7242-ge037a0fa040ee1a3500c8523f3ffa713069ac283
Author: Juzhe-Zhong <juzhe.zhong@rivai.ai>
Date:   Mon Jan 15 18:35:07 2024 +0800

    RISC-V: Remove m_num_vector_iterations[NFC]
    
    Notice the m_num_vector_iterations is not used, remove the redundant codes.
    
    Committed.
    
    gcc/ChangeLog:
    
            * config/riscv/riscv-vector-costs.cc (costs::analyze_loop_vinfo):
            Remove m_num_vector_iterations.
            * config/riscv/riscv-vector-costs.h: Ditto.

Diff:
---
 gcc/config/riscv/riscv-vector-costs.cc | 13 -------------
 gcc/config/riscv/riscv-vector-costs.h  |  5 -----
 2 files changed, 18 deletions(-)

diff --git a/gcc/config/riscv/riscv-vector-costs.cc b/gcc/config/riscv/riscv-vector-costs.cc
index 1c3708f23a0..090275c7efe 100644
--- a/gcc/config/riscv/riscv-vector-costs.cc
+++ b/gcc/config/riscv/riscv-vector-costs.cc
@@ -872,19 +872,6 @@ costs::costs (vec_info *vinfo, bool costing_for_scalar)
 void
 costs::analyze_loop_vinfo (loop_vec_info loop_vinfo)
 {
-  /* Record the number of times that the vector loop would execute,
-     if known.  */
-  class loop *loop = LOOP_VINFO_LOOP (loop_vinfo);
-  auto scalar_niters = max_stmt_executions_int (loop);
-  if (scalar_niters >= 0)
-    {
-      unsigned int vf = vect_vf_for_cost (loop_vinfo);
-      if (LOOP_VINFO_LENS (loop_vinfo).is_empty ())
-	m_num_vector_iterations = scalar_niters / vf;
-      else
-	m_num_vector_iterations = CEIL (scalar_niters, vf);
-    }
-
   /* Detect whether we're vectorizing for VLA and should apply the unrolling
      heuristic described above m_unrolled_vls_niters.  */
   record_potential_vls_unrolling (loop_vinfo);
diff --git a/gcc/config/riscv/riscv-vector-costs.h b/gcc/config/riscv/riscv-vector-costs.h
index 9bf041bb65c..dc0d61f5d4a 100644
--- a/gcc/config/riscv/riscv-vector-costs.h
+++ b/gcc/config/riscv/riscv-vector-costs.h
@@ -85,11 +85,6 @@ private:
   unsigned HOST_WIDE_INT m_unrolled_vls_niters = 0;
   unsigned HOST_WIDE_INT m_unrolled_vls_stmts = 0;
 
-  /* If we're vectorizing a loop that executes a constant number of times,
-     this variable gives the number of times that the vector loop would
-     iterate, otherwise it is zero.  */
-  uint64_t m_num_vector_iterations = 0;
-
   void analyze_loop_vinfo (loop_vec_info);
   void record_potential_vls_unrolling (loop_vec_info);
   bool prefer_unrolled_loop () const;