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SimplifyCFG: Use ComputeMaskedBits to prune dead cases from switch instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131345 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-05-14 15:57:25 +00:00
parent 67f071e697
commit 10fcfb53fd
2 changed files with 74 additions and 1 deletions
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test/Transforms/SimplifyCFG/switch-masked-bits.ll
+38
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@@ -0,0 +1,38 @@
; RUN: opt -S -simplifycfg < %s | FileCheck %s
define i32 @test1(i32 %x) nounwind {
%i = shl i32 %x, 1
switch i32 %i, label %a [
i32 21, label %b
i32 24, label %c
]
a:
ret i32 0
b:
ret i32 3
c:
ret i32 5
; CHECK: @test1
; CHECK: %cond = icmp eq i32 %i, 24
; CHECK: %merge = select i1 %cond, i32 5, i32 0
; CHECK: ret i32 %merge
}
define i32 @test2(i32 %x) nounwind {
%i = shl i32 %x, 1
switch i32 %i, label %a [
i32 21, label %b
i32 23, label %c
]
a:
ret i32 0
b:
ret i32 3
c:
ret i32 5
; CHECK: @test2
; CHECK: ret i32 0
}