File: scoped-noalias.ll

package info (click to toggle)
llvm-toolchain-20 1%3A20.1.6-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,111,304 kB
  • sloc: cpp: 7,438,677; ansic: 1,393,822; asm: 1,012,926; python: 241,650; f90: 86,635; objc: 75,479; lisp: 42,144; pascal: 17,286; sh: 10,027; ml: 5,082; perl: 4,730; awk: 3,523; makefile: 3,349; javascript: 2,251; xml: 892; fortran: 672
file content (34 lines) | stat: -rw-r--r-- 1,008 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=dse < %s | FileCheck %s

; Assume that %p1 != %p2 if and only if %c is true. In that case the noalias
; metadata is correct, but the first store cannot be eliminated, as it may be
; read-clobbered by the load.
define void @test(i1 %c, ptr %p1, ptr %p2) {
; CHECK-LABEL: @test(
; CHECK-NEXT:    store i8 0, ptr [[P1:%.*]], align 1
; CHECK-NEXT:    [[TMP1:%.*]] = load i8, ptr [[P2:%.*]], align 1, !alias.scope !0
; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK:       if:
; CHECK-NEXT:    store i8 1, ptr [[P1]], align 1, !noalias !0
; CHECK-NEXT:    ret void
; CHECK:       else:
; CHECK-NEXT:    store i8 2, ptr [[P1]], align 1
; CHECK-NEXT:    ret void
;
  store i8 0, ptr %p1
  load i8, ptr %p2, !alias.scope !2
  br i1 %c, label %if, label %else

if:
  store i8 1, ptr %p1, !noalias !2
  ret void

else:
  store i8 2, ptr %p1
  ret void
}

!0 = !{!0}
!1 = !{!1, !0}
!2 = !{!1}