derek.holloway
7502bf64a4
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54 lines
1.2 KiB
LLVM
54 lines
1.2 KiB
LLVM
; RUN: opt < %s -passes=dfsan -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-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@a = common global i32 0
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@b = common global i32 0
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; Check that we reuse unions where possible.
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; CHECK-LABEL: @f.dfsan
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define void @f(i32 %x, i32 %y) {
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; CHECK: or i8
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%xay = add i32 %x, %y
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store i32 %xay, ptr @a
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; CHECK-NOT: or i8
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%xmy = mul i32 %x, %y
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store i32 %xmy, ptr @b
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ret void
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}
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; In this case, we compute the unions on both sides because neither block
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; dominates the other.
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; CHECK-LABEL: @g.dfsan
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define void @g(i1 %p, i32 %x, i32 %y) {
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br i1 %p, label %l1, label %l2
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l1:
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; CHECK: or i8
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%xay = add i32 %x, %y
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store i32 %xay, ptr @a
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br label %l3
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l2:
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; CHECK: or i8
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%xmy = mul i32 %x, %y
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store i32 %xmy, ptr @b
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br label %l3
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l3:
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ret void
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}
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; In this case, we know that the label for %xayax subsumes the label for %xay.
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; CHECK-LABEL: @h.dfsan
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define i32 @h(i32 %x, i32 %y) {
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; CHECK: or i8
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%xay = add i32 %x, %y
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; CHECK-NOT: or i8
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%xayax = add i32 %xay, %x
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ret i32 %xayax
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}
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