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make LazyValueInfo analyze the default case of switch statements (we know that in the default branch the value cannot be any of the switch cases)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159353 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-06-28 16:13:37 +00:00
parent 62d7afad8f
commit e50487796d
2 changed files with 38 additions and 16 deletions
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23
test/Transforms/CorrelatedValuePropagation/range.ll
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@@ -142,3 +142,26 @@ sw.bb:
; CHECK: ret i1 true
ret i1 %cmp2
}
; CHECK: @test7
define i1 @test7(i32 %c) nounwind {
entry:
switch i32 %c, label %sw.default [
i32 6, label %sw.bb
i32 7, label %sw.bb
]
sw.bb:
ret i1 true
sw.default:
%cmp5 = icmp eq i32 %c, 5
%cmp6 = icmp eq i32 %c, 6
%cmp7 = icmp eq i32 %c, 7
%cmp8 = icmp eq i32 %c, 8
; CHECK: %or = or i1 %cmp5, false
%or = or i1 %cmp5, %cmp6
; CHECK: %or2 = or i1 false, %cmp8
%or2 = or i1 %cmp7, %cmp8
ret i1 false
}