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Imported Upstream version 5.18.0.179

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Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215
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Xamarin Public Jenkins (auto-signing)
2018-10-25 08:34:57 +00:00
parent d6bde52373
commit 8625704ad8
28485 changed files with 3866843 additions and 50 deletions
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24
external/llvm/test/Analysis/ValueTracking/knownzero-addrspacecast.ll vendored Normal file
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; RUN: opt -instcombine -S < %s | FileCheck %s
; When a pointer is addrspacecasted to a another addr space, we cannot assume
; anything about the new bits.
target datalayout = "p:32:32-p3:32:32-p4:64:64"
; CHECK-LABEL: @test_shift
; CHECK-NOT: ret i64 0
define i64 @test_shift(i8* %p) {
%g = addrspacecast i8* %p to i8 addrspace(4)*
%i = ptrtoint i8 addrspace(4)* %g to i64
%shift = lshr i64 %i, 32
ret i64 %shift
}
; CHECK-LABEL: @test_null
; A null pointer casted to another addr space may no longer have null value.
; CHECK-NOT: ret i32 0
define i32 @test_null() {
%g = addrspacecast i8* null to i8 addrspace(3)*
%i = ptrtoint i8 addrspace(3)* %g to i32
ret i32 %i
}