llvm-project/llvm/test/CodeGen/X86/backpropmask.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=x86_64-unknown-unknown < %s | FileCheck %s

; Verify that backwards propagation of a mask does not affect
; nodes with multiple result values. In both tests, the stored
; 32-bit value should be masked to an 8-bit number (and 255).

@b = local_unnamed_addr global i32 918, align 4
@d = local_unnamed_addr global i32 8089, align 4
@c = common local_unnamed_addr global i32 0, align 4
@a = common local_unnamed_addr global i32 0, align 4

define void @PR37667() {
; CHECK-LABEL: PR37667:
; CHECK:       # %bb.0:
; CHECK-NEXT:    movl {{.*}}(%rip), %eax
; CHECK-NEXT:    xorl %edx, %edx
; CHECK-NEXT:    divl {{.*}}(%rip)
; CHECK-NEXT:    orl {{.*}}(%rip), %edx
; CHECK-NEXT:    movzbl %dl, %eax
; CHECK-NEXT:    movl %eax, {{.*}}(%rip)
; CHECK-NEXT:    retq
  %t0 = load i32, i32* @c, align 4
  %t1 = load i32, i32* @b, align 4
  %t2 = load i32, i32* @d, align 4
  %rem = urem i32 %t1, %t2
  %or = or i32 %rem, %t0
  %conv1 = and i32 %or, 255
  store i32 %conv1, i32* @a, align 4
  ret void
}

define void @PR37060() {
; CHECK-LABEL: PR37060:
; CHECK:       # %bb.0:
; CHECK-NEXT:    movl $-1, %eax
; CHECK-NEXT:    cltd
; CHECK-NEXT:    idivl {{.*}}(%rip)
; CHECK-NEXT:    xorl {{.*}}(%rip), %edx
; CHECK-NEXT:    movzbl %dl, %eax
; CHECK-NEXT:    movl %eax, {{.*}}(%rip)
; CHECK-NEXT:    retq
  %t0 = load i32, i32* @c, align 4
  %rem = srem i32 -1, %t0
  %t2 = load i32, i32* @b, align 4
  %xor = xor i32 %t2, %rem
  %conv3 = and i32 %xor, 255
  store i32 %conv3, i32* @a, align 4
  ret void
}