1; REQUIRES: asserts 2; RUN: llc < %s -disable-preheader-prot=true -march=x86 -stats 2>&1 | grep "Number of blocks eliminated" | grep 6 3; RUN: llc < %s -disable-preheader-prot=false -march=x86 -stats 2>&1 | grep "Number of blocks eliminated" | grep 3 4; PR1296 5 6target 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" 7target triple = "i686-apple-darwin8" 8 9define i32 @foo(i32 %A, i32 %B, i32 %C) nounwind { 10entry: 11 switch i32 %A, label %out [ 12 i32 1, label %bb 13 i32 0, label %bb13 14 i32 2, label %bb35 15 ] 16 17bb: ; preds = %cond_next, %entry 18 %i.144.1 = phi i32 [ 0, %entry ], [ %tmp7, %cond_next ] ; <i32> [#uses=2] 19 %tmp4 = and i32 %i.144.1, %B ; <i32> [#uses=1] 20 icmp eq i32 %tmp4, 0 ; <i1>:0 [#uses=1] 21 br i1 %0, label %cond_next, label %out 22 23cond_next: ; preds = %bb 24 %tmp7 = add i32 %i.144.1, 1 ; <i32> [#uses=2] 25 icmp slt i32 %tmp7, 1000 ; <i1>:1 [#uses=1] 26 br i1 %1, label %bb, label %out 27 28bb13: ; preds = %cond_next18, %entry 29 %i.248.1 = phi i32 [ 0, %entry ], [ %tmp20, %cond_next18 ] ; <i32> [#uses=2] 30 %tmp16 = and i32 %i.248.1, %C ; <i32> [#uses=1] 31 icmp eq i32 %tmp16, 0 ; <i1>:2 [#uses=1] 32 br i1 %2, label %cond_next18, label %out 33 34cond_next18: ; preds = %bb13 35 %tmp20 = add i32 %i.248.1, 1 ; <i32> [#uses=2] 36 icmp slt i32 %tmp20, 1000 ; <i1>:3 [#uses=1] 37 br i1 %3, label %bb13, label %out 38 39bb27: ; preds = %bb35 40 %tmp30 = and i32 %i.3, %C ; <i32> [#uses=1] 41 icmp eq i32 %tmp30, 0 ; <i1>:4 [#uses=1] 42 br i1 %4, label %cond_next32, label %out 43 44cond_next32: ; preds = %bb27 45 %indvar.next = add i32 %i.3, 1 ; <i32> [#uses=1] 46 br label %bb35 47 48bb35: ; preds = %entry, %cond_next32 49 %i.3 = phi i32 [ %indvar.next, %cond_next32 ], [ 0, %entry ] ; <i32> [#uses=3] 50 icmp slt i32 %i.3, 1000 ; <i1>:5 [#uses=1] 51 br i1 %5, label %bb27, label %out 52 53out: ; preds = %bb27, %bb35, %bb13, %cond_next18, %bb, %cond_next, %entry 54 %result.0 = phi i32 [ 0, %entry ], [ 1, %bb ], [ 0, %cond_next ], [ 1, %bb13 ], [ 0, %cond_next18 ], [ 1, %bb27 ], [ 0, %bb35 ] ; <i32> [#uses=1] 55 ret i32 %result.0 56} 57