File: assume-inseltpoison.ll

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S -instcombine-infinite-loop-threshold=2 | FileCheck %s

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; A copy of assume.ll, with undef at insertelement/shufflevector replaced with
; poison.
declare void @llvm.assume(i1) #1

; This would crash.
; Does it ever make sense to peek through a bitcast of the icmp operand?

define i32 @PR40940(<4 x i8> %x) {
; CHECK-LABEL: @PR40940(
; CHECK-NEXT:    [[SHUF:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> <i32 1, i32 1, i32 2, i32 3>
; CHECK-NEXT:    [[T2:%.*]] = bitcast <4 x i8> [[SHUF]] to i32
; CHECK-NEXT:    [[T3:%.*]] = icmp ult i32 [[T2]], 65536
; CHECK-NEXT:    call void @llvm.assume(i1 [[T3]])
; CHECK-NEXT:    ret i32 [[T2]]
;
  %shuf = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> <i32 1, i32 1, i32 2, i32 3>
  %t2 = bitcast <4 x i8> %shuf to i32
  %t3 = icmp ult i32 %t2, 65536
  call void @llvm.assume(i1 %t3)
  ret i32 %t2
}