llvm/test/CodeGen/RISCV/rvv/rv64-vsetvli-intrinsics.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=riscv64 -mattr=+experimental-v -verify-machineinstrs < %s | FileCheck %s

declare i64 @llvm.riscv.vsetvli.i64(i64, i64, i64)
declare i64 @llvm.riscv.vsetvlimax.i64(i64, i64)

define void @test_vsetvli_e8m1(i64 %avl) nounwind {
; CHECK-LABEL: test_vsetvli_e8m1:
; CHECK:       # %bb.0:
; CHECK-NEXT:    vsetvli a0, a0, e8, m1, ta, mu
; CHECK-NEXT:    ret
  call i64 @llvm.riscv.vsetvli.i64(i64 %avl, i64 0, i64 0)
  ret void
}

define void @test_vsetvli_e16mf4(i64 %avl) nounwind {
; CHECK-LABEL: test_vsetvli_e16mf4:
; CHECK:       # %bb.0:
; CHECK-NEXT:    vsetvli a0, a0, e16, mf4, ta, mu
; CHECK-NEXT:    ret
  call i64 @llvm.riscv.vsetvli.i64(i64 %avl, i64 1, i64 6)
  ret void
}

define void @test_vsetvli_e32mf8_zero_avl() nounwind {
; CHECK-LABEL: test_vsetvli_e32mf8_zero_avl:
; CHECK:       # %bb.0:
; CHECK-NEXT:    vsetivli a0, 0, e16, mf4, ta, mu
; CHECK-NEXT:    ret
  call i64 @llvm.riscv.vsetvli.i64(i64 0, i64 1, i64 6)
  ret void
}

define void @test_vsetvlimax_e32m2() nounwind {
; CHECK-LABEL: test_vsetvlimax_e32m2:
; CHECK:       # %bb.0:
; CHECK-NEXT:    vsetvli a0, zero, e32, m2, ta, mu
; CHECK-NEXT:    ret
  call i64 @llvm.riscv.vsetvlimax.i64(i64 2, i64 1)
  ret void
}

define void @test_vsetvlimax_e64m4() nounwind {
; CHECK-LABEL: test_vsetvlimax_e64m4:
; CHECK:       # %bb.0:
; CHECK-NEXT:    vsetvli a0, zero, e64, m4, ta, mu
; CHECK-NEXT:    ret
  call i64 @llvm.riscv.vsetvlimax.i64(i64 3, i64 2)
  ret void
}

declare <vscale x 4 x i32> @llvm.riscv.vle.nxv4i32.i64(<vscale x 4 x i32>*, i64)

; Check that we remove the redundant vsetvli when followed by another operation
define <vscale x 4 x i32> @redundant_vsetvli(i64 %avl, <vscale x 4 x i32>* %ptr) nounwind {
; CHECK-LABEL: redundant_vsetvli:
; CHECK:       # %bb.0:
; CHECK-NEXT:    vsetvli a0, a0, e32, m2, ta, mu
; CHECK-NEXT:    vle32.v v8, (a1)
; CHECK-NEXT:    ret
  %vl = call i64 @llvm.riscv.vsetvli.i64(i64 %avl, i64 2, i64 1)
  %x = call <vscale x 4 x i32> @llvm.riscv.vle.nxv4i32.i64(<vscale x 4 x i32>* %ptr, i64 %vl)
  ret <vscale x 4 x i32> %x
}

; Check that we remove the repeated/redundant vsetvli when followed by another
; operation
; FIXME: We don't catch the second vsetvli because it has a use of its output.
; We could replace it with the output of the first vsetvli.
define <vscale x 4 x i32> @repeated_vsetvli(i64 %avl, <vscale x 4 x i32>* %ptr) nounwind {
; CHECK-LABEL: repeated_vsetvli:
; CHECK:       # %bb.0:
; CHECK-NEXT:    vsetvli a0, a0, e32, m2, ta, mu
; CHECK-NEXT:    vsetvli a0, a0, e32, m2, ta, mu
; CHECK-NEXT:    vle32.v v8, (a1)
; CHECK-NEXT:    ret
  %vl0 = call i64 @llvm.riscv.vsetvli.i64(i64 %avl, i64 2, i64 1)
  %vl1 = call i64 @llvm.riscv.vsetvli.i64(i64 %vl0, i64 2, i64 1)
  %x = call <vscale x 4 x i32> @llvm.riscv.vle.nxv4i32.i64(<vscale x 4 x i32>* %ptr, i64 %vl1)
  ret <vscale x 4 x i32> %x
}