RISC-V: Fix one warning of maybe-uninitialized in riscv-vsetvl.cc

This patch would like to fix one maybe-uninitialized warning. Aka:

riscv-vsetvl.cc:4354:3: error: 'vsetvl_rinsn' may be used uninitialized [-Werror=maybe-uninitialized]

Signed-off-by: Pan Li <pan2.li@intel.com>
gcc/ChangeLog:

	* config/riscv/riscv-vsetvl.cc
	(pass_vsetvl::global_eliminate_vsetvl_insn): Initialize var by NULL.

diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index cae9be0d928e6977eae54c50297435da2316bc1e..7066dea3d14430517750017513ec0f6bc675919a 100644 (file)
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -4340,7 +4340,7 @@ get_first_vsetvl_before_rvv_insns (basic_block cfg_bb)
 bool
 pass_vsetvl::global_eliminate_vsetvl_insn (const bb_info *bb) const
 {
-  rtx_insn *vsetvl_rinsn;
+  rtx_insn *vsetvl_rinsn = NULL;
   vector_insn_info dem = vector_insn_info ();
   const auto &block_info = get_block_info (bb);
   basic_block cfg_bb = bb->cfg_bb ();