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SimplifyCFG: Also transform switches that represent a range comparison but are not sorted into sub+icmp.

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This transforms another 1000 switches in gcc.c.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124826 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-02-03 22:51:41 +00:00
parent d931dca6e5
commit 042b27f40e
2 changed files with 58 additions and 7 deletions
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test/Transforms/SimplifyCFG/switch-to-icmp.ll
+40
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; RUN: opt -S -simplifycfg < %s | FileCheck %s
define zeroext i1 @test1(i32 %x) nounwind readnone ssp noredzone {
entry:
switch i32 %x, label %lor.rhs [
i32 2, label %lor.end
i32 1, label %lor.end
i32 3, label %lor.end
]
lor.rhs:
br label %lor.end
lor.end:
%0 = phi i1 [ true, %entry ], [ false, %lor.rhs ], [ true, %entry ], [ true, %entry ]
ret i1 %0
; CHECK: @test1
; CHECK: %off = add i32 %x, -1
; CHECK: %switch = icmp ult i32 %off, 3
}
define zeroext i1 @test2(i32 %x) nounwind readnone ssp noredzone {
entry:
switch i32 %x, label %lor.rhs [
i32 0, label %lor.end
i32 1, label %lor.end
]
lor.rhs:
br label %lor.end
lor.end:
%0 = phi i1 [ true, %entry ], [ false, %lor.rhs ], [ true, %entry ]
ret i1 %0
; CHECK: @test2
; CHECK: %off = add i32 %x, 0
; CHECK: %switch = icmp ult i32 %off, 2
}