[Bug rtl-optimization/113495] RISC-V: Time and memory awful consumption of SPEC2017 wrf benchmark

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113495

--- Comment #12 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
Ok. Here is a simple fix which give some hints:


diff --git a/gcc/config/riscv/riscv-vsetvl.cc
b/gcc/config/riscv/riscv-vsetvl.cc
index 2067073185f..ede818140dc 100644
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -2719,10 +2719,11 @@ pre_vsetvl::compute_lcm_local_properties ()
          for (int i = 0; i < num_exprs; i += 1)
            {
              const vsetvl_info &info = *m_exprs[i];
-             if (!info.has_nonvlmax_reg_avl () && !info.has_vl ())
+             bool has_nonvlmax_reg_avl_p = info.has_nonvlmax_reg_avl ();
+             if (!has_nonvlmax_reg_avl_p && !info.has_vl ())
                continue;

-             if (info.has_nonvlmax_reg_avl ())
+             if (has_nonvlmax_reg_avl_p)
                {
                  unsigned int regno;
                  sbitmap_iterator sbi;
@@ -3556,7 +3557,7 @@ const pass_data pass_data_vsetvl = {
   RTL_PASS,     /* type */
   "vsetvl",     /* name */
   OPTGROUP_NONE, /* optinfo_flags */
-  TV_NONE,      /* tv_id */
+  TV_MACH_DEP,  /* tv_id */
   0,            /* properties_required */
   0,            /* properties_provided */
   0,            /* properties_destroyed */


Memory usage from 931M -> 781M. Memory usage reduce significantly.

Note that I didn't change all has_nonvlmax_reg_avl, We have so many places
calling  has_nonvlmax_reg_avl...