diff --git a/llvm/test/CodeGen/RISCV/rvv/vsetvli-regression.ll b/llvm/test/CodeGen/RISCV/rvv/vsetvli-regression.ll new file mode 100644 --- /dev/null +++ b/llvm/test/CodeGen/RISCV/rvv/vsetvli-regression.ll @@ -0,0 +1,22 @@ +; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py +; RUN: llc < %s -mtriple=riscv64 -mattr=+experimental-v | FileCheck %s + +; This test checks a regression in the vsetvli insertion pass. We used to +; prserve the VL on the second vsetvli with ratio e32/m1, when the the last +; update of VL was the vsetvli with e64/m4. Changing VTYPE here changes VLMAX +; which may make the original VL invalid. Instead of preserving it we use 0. + +define i32 @illegal_preserve_vl( %a, %x, * %y) { +; CHECK-LABEL: illegal_preserve_vl: +; CHECK: # %bb.0: +; CHECK-NEXT: vsetvli a1, zero, e64, m4, ta, mu +; CHECK-NEXT: vadd.vv v28, v12, v12 +; CHECK-NEXT: vs4r.v v28, (a0) +; CHECK-NEXT: vsetivli zero, 0, e32, m1, ta, mu +; CHECK-NEXT: vmv.x.s a0, v8 +; CHECK-NEXT: ret + %index = add %x, %x + store %index, * %y + %elt = extractelement %a, i64 0 + ret i32 %elt +}