derek.holloway
7502bf64a4
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24 lines
826 B
LLVM
24 lines
826 B
LLVM
; XFAIL: *
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; RUN: opt -passes=dse -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.7.0"
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; Basic correctness tests for atomic stores.
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; Note that it turns out essentially every transformation DSE does is legal on
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; atomic ops, just some transformations are not allowed across release-acquire pairs.
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@x = common global i32 0, align 4
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@y = common global i32 0, align 4
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; DSE across monotonic load (allowed as long as the eliminated store isUnordered)
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define i32 @test9() {
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; CHECK-LABEL: test9
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; CHECK-NOT: store i32 0
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; CHECK: store i32 1
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store i32 0, ptr @x
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%x = load atomic i32, ptr @y monotonic, align 4
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store i32 1, ptr @x
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ret i32 %x
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}
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