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[MemCpyOpt] Don't sink LoadInst below possible clobber.
Differential Revision: https://reviews.llvm.org/D26811 llvm-svn: 290611
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py | ||
; RUN: opt -basicaa -scoped-noalias -memcpyopt -S %s | FileCheck %s | ||
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%T = type { i8, i32 } | ||
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; memcpy(%d, %a) should not be generated since store2 may-aliases load %a. | ||
define void @f(%T* %a, %T* %b, %T* %c, %T* %d) { | ||
; CHECK-LABEL: @f( | ||
; CHECK-NEXT: [[VAL:%.*]] = load %T, %T* %a, !alias.scope !0 | ||
; CHECK-NEXT: store %T { i8 23, i32 23 }, %T* %b, !alias.scope !3 | ||
; CHECK-NEXT: store %T { i8 44, i32 44 }, %T* %c, !alias.scope !6, !noalias !3 | ||
; CHECK-NEXT: store %T [[VAL]], %T* %d, !alias.scope !9, !noalias !12 | ||
; CHECK-NEXT: ret void | ||
; | ||
%val = load %T, %T* %a, !alias.scope !{!10} | ||
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; store1 may-aliases the load | ||
store %T { i8 23, i32 23 }, %T* %b, !alias.scope !{!11} | ||
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; store2 may-aliases the load and store3 | ||
store %T { i8 44, i32 44 }, %T* %c, !alias.scope !{!12}, !noalias !{!11} | ||
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; store3 | ||
store %T %val, %T* %d, !alias.scope !{!13}, !noalias !{!10, !11} | ||
ret void | ||
} | ||
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!0 = !{!0} | ||
!1 = !{!1} | ||
!2 = !{!2} | ||
!3 = !{!3} | ||
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!10 = !{ !10, !0 } | ||
!11 = !{ !11, !1 } | ||
!12 = !{ !12, !2 } | ||
!13 = !{ !13, !3 } |