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In cases such as the attached test, where the case value for a switch destination is used in a phi node that follows the destination, it might be better to replace that value with the condition value of the switch, so that more blocks can be folded away with TryToSimplifyUncondBranchFromEmptyBlock because there are less conflicts in the phi node. llvm-svn: 133344
37 lines
1.1 KiB
LLVM
37 lines
1.1 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | \
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; RUN: not grep " switch"
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; PR10131
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; ModuleID = '<stdin>'
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
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target triple = "i386-pc-linux-gnu"
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define i32 @t(i32 %m) nounwind readnone {
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entry:
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switch i32 %m, label %sw.bb4 [
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i32 0, label %sw.bb0
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i32 1, label %sw.bb1
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i32 2, label %sw.bb2
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i32 3, label %sw.bb3
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]
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sw.bb0: ; preds = %entry
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br label %return
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sw.bb1: ; preds = %entry
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br label %return
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sw.bb2: ; preds = %entry
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br label %return
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sw.bb3: ; preds = %entry
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br label %return
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sw.bb4: ; preds = %entry
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br label %return
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return: ; preds = %entry, %sw.bb4, %sw.bb3, %sw.bb2, %sw.bb1
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%retval.0 = phi i32 [ 4, %sw.bb4 ], [ 3, %sw.bb3 ], [ 2, %sw.bb2 ], [ 1, %sw.bb1 ], [ 0, %sw.bb0 ]
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ret i32 %retval.0
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}
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