1; RUN: opt < %s -simplifycfg -phi-node-folding-threshold=2 -S | FileCheck %s 2 3target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 4target triple = "x86_64-unknown-linux-gnu" 5 6define i32 @test1(i32 %a, i32 %b, i32 %c) nounwind { 7; CHECK: @test1 8entry: 9 %tmp1 = icmp eq i32 %b, 0 10 br i1 %tmp1, label %bb1, label %bb3 11 12bb1: ; preds = %entry 13 %tmp2 = icmp sgt i32 %c, 1 14 br i1 %tmp2, label %bb2, label %bb3 15; CHECK: bb1: 16; CHECK-NEXT: icmp sgt i32 %c, 1 17; CHECK-NEXT: add i32 %a, 1 18; CHECK-NEXT: select i1 %tmp2, i32 %tmp3, i32 %a 19; CHECK-NEXT: br label %bb3 20 21bb2: ; preds = bb1 22 %tmp3 = add i32 %a, 1 23 br label %bb3 24 25bb3: ; preds = %bb2, %entry 26 %tmp4 = phi i32 [ %b, %entry ], [ %a, %bb1 ], [ %tmp3, %bb2 ] 27 %tmp5 = sub i32 %tmp4, 1 28 ret i32 %tmp5 29} 30 31declare i8 @llvm.cttz.i8(i8, i1) 32 33define i8 @test2(i8 %a) { 34; CHECK: @test2 35 br i1 undef, label %bb_true, label %bb_false 36bb_true: 37 %b = tail call i8 @llvm.cttz.i8(i8 %a, i1 false) 38 br label %join 39bb_false: 40 br label %join 41join: 42 %c = phi i8 [%b, %bb_true], [%a, %bb_false] 43; CHECK: select 44 ret i8 %c 45} 46 47