[PATCH] RISC-V: Fix ICE in riscv vector costs

[demin.han]

The following code can result in ICE:
-march=rv64gcv_zba_zbb --param riscv-autovec-lmul=dynamic -O3

char *jpeg_difference7_input_buf;
void jpeg_difference7(int *diff_buf) {
  unsigned width;
  int samp, Rb;
  while (--width) {
    Rb = samp = *jpeg_difference7_input_buf;
    *diff_buf++ = -(int)(samp + (long)Rb >> 1);
  }
}

One biggest_mode update missed in one branch and trigger assertion fail.
gcc_assert (biggest_size >= mode_size);

Tested On RV64 and no regression.

gcc/ChangeLog:

        * config/riscv/riscv-vector-costs.cc: Fix ICE

Signed-off-by: demin.han <demin....@starfivetech.com>
---
 gcc/config/riscv/riscv-vector-costs.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/config/riscv/riscv-vector-costs.cc 
b/gcc/config/riscv/riscv-vector-costs.cc
index 7c9840df4e9..f13a1296b31 100644
--- a/gcc/config/riscv/riscv-vector-costs.cc
+++ b/gcc/config/riscv/riscv-vector-costs.cc
@@ -413,6 +413,8 @@ compute_local_live_ranges (
                                  auto *r = get_live_range (live_ranges, arg);
                                  gcc_assert (r);
                                  (*r).second = MAX (point, (*r).second);
+                                 biggest_mode = get_biggest_mode (
+                                   biggest_mode, TYPE_MODE (TREE_TYPE (arg)));
                                }
                            }
                          else
-- 
2.44.0