[llvm] [RISCV][VSETVLI] Prefer VTYPE for immediate known to be less than VLMAX (PR #69759)

[Craig Topper via llvm-commits]

================
@@ -14,7 +14,7 @@ define <vscale x 8 x i32> @insert_nxv8i32_v2i32_0(<vscale x 8 x i32> %vec, ptr %
 ; CHECK:       # %bb.0:
 ; CHECK-NEXT:    vsetivli zero, 2, e32, mf2, ta, ma
 ; CHECK-NEXT:    vle32.v v12, (a0)
-; CHECK-NEXT:    vsetivli zero, 2, e32, m4, tu, ma
+; CHECK-NEXT:    vsetvli zero, zero, e32, m4, tu, ma
 ; CHECK-NEXT:    vmv.v.v v8, v12
----------------
topperc wrote:

Can we just do a tail undisturbed load to avoid the vmv.v.v?

https://github.com/llvm/llvm-project/pull/69759