From: Ju-Zhe Zhong <[email protected]>
Since LCM will destroy CFG, we are going to reorder the location of VSETVL PASS
at least before bbro (block-reorder PASS) which is before split3 PASS. We need
to call it in VSETVL PASS to get final RVV instructions patterns.
gcc/ChangeLog:
* config/riscv/riscv-vsetvl.cc (pass_vsetvl::execute): Always call
split_all_insns.
---
gcc/config/riscv/riscv-vsetvl.cc | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index 0245124e28f..d494369a603 100644
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -3092,12 +3092,10 @@ pass_vsetvl::execute (function *)
if (n_basic_blocks_for_fn (cfun) <= 0)
return 0;
- /* The reason we have this since we didn't finish splitting yet
- when optimize == 0. In this case, we should conservatively
- split all instructions here to make sure we don't miss any
- RVV instruction. */
- if (!optimize)
- split_all_insns ();
+ /* The RVV instruction may change after split which is not a stable
+ instruction. We need to split it here to avoid potential issue
+ since the VSETVL PASS is insert before split PASS. */
+ split_all_insns ();
/* Early return for there is no vector instructions. */
if (!has_vector_insn (cfun))
--
2.36.3
