llvm/test/CodeGen/NVPTX/dead-shfl.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt < %s -passes=instsimplify -S -mtriple=nvptx64-nvidia-cuda | FileCheck %s

declare { i32, i1 } @llvm.nvvm.shfl.idx.i32p(i32, i32, i32)

; Test that dead shuffle instructions are eliminated.
define void @test_dead_shfl_const_zero(i32 %lane) #0 {
; CHECK-LABEL: define void @test_dead_shfl_const_zero(
; CHECK-SAME: i32 [[LANE:%.*]]) #[[ATTR1:[0-9]+]] {
; CHECK-NEXT:    ret void
;
  %r0 = call { i32, i1 } @llvm.nvvm.shfl.idx.i32p(i32 0, i32 %lane, i32 31)
  %r1 = call { i32, i1 } @llvm.nvvm.shfl.idx.i32p(i32 0, i32 %lane, i32 31)
  %r2 = call { i32, i1 } @llvm.nvvm.shfl.idx.i32p(i32 0, i32 %lane, i32 31)
  %r3 = call { i32, i1 } @llvm.nvvm.shfl.idx.i32p(i32 0, i32 %lane, i32 31)
  ret void
}

attributes #0 = { convergent }