File: subreg-to-reg-1.ll

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llvm-toolchain-20 1%3A20.1.6-1~exp1
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
; RUN: llc < %s -mtriple=x86_64-- | FileCheck %s

; Don't eliminate or coalesce away the explicit zero-extension!
; This is currently using an leal because of a 3-addressification detail,
; though this isn't necessary; The point of this test is to make sure
; a 32-bit add is used.

define i64 @foo(i64 %a) nounwind {
; CHECK-LABEL: foo:
; CHECK:       # %bb.0:
; CHECK-NEXT:    leal -1(%rdi), %eax
; CHECK-NEXT:    incq %rax
; CHECK-NEXT:    retq
  %b = add i64 %a, 4294967295
  %c = and i64 %b, 4294967295
  %d = add i64 %c, 1
  ret i64 %d
}