switch-to-icmp.ll   [plain text]

; 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: %x.off = add i32 %x, -1
; CHECK: %switch = icmp ult i32 %x.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: %switch = icmp ult i32 %x, 2
}