derek.holloway
7502bf64a4
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25 lines
695 B
LLVM
25 lines
695 B
LLVM
; RUN: opt -passes=instcombine -S < %s | FileCheck %s
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; When a pointer is addrspacecasted to a another addr space, we cannot assume
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; anything about the new bits.
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target datalayout = "p:32:32-p3:32:32-p4:64:64"
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; CHECK-LABEL: @test_shift
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; CHECK-NOT: ret i64 0
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define i64 @test_shift(ptr %p) {
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%g = addrspacecast ptr %p to ptr addrspace(4)
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%i = ptrtoint ptr addrspace(4) %g to i64
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%shift = lshr i64 %i, 32
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ret i64 %shift
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}
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; CHECK-LABEL: @test_null
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; A null pointer casted to another addr space may no longer have null value.
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; CHECK-NOT: ret i32 0
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define i32 @test_null() {
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%g = addrspacecast ptr null to ptr addrspace(3)
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%i = ptrtoint ptr addrspace(3) %g to i32
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ret i32 %i
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}
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