[RISCV] Use empty() instead of size()==0. NFC

[topperc]

Move the assert past the code that determines if the pass should run.

[llvmbot]

@llvm/pr-subscribers-backend-risc-v

Author: Craig Topper (topperc)

Changes

Move the assert past the code that determines if the pass should run.

---

Full diff: https://github.com/llvm/llvm-project/pull/149868.diff

1 Files Affected:

• (modified) llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp (+2-1)

diff --git a/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp b/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
index 15bd3466373a7..b53d919872de5 100644
--- a/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
+++ b/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
@@ -1486,7 +1486,6 @@ bool RISCVVLOptimizer::tryReduceVL(MachineInstr &MI) const {
 }
 
 bool RISCVVLOptimizer::runOnMachineFunction(MachineFunction &MF) {
-  assert(DemandedVLs.size() == 0);
   if (skipFunction(MF.getFunction()))
     return false;
 
@@ -1499,6 +1498,8 @@ bool RISCVVLOptimizer::runOnMachineFunction(MachineFunction &MF) {
 
   TII = ST.getInstrInfo();
 
+  assert(DemandedVLs.empty());
+
   // For each instruction that defines a vector, compute what VL its
   // downstream users demand.
   for (MachineBasicBlock *MBB : post_order(&MF)) {