1 ; RUN: opt < %s -simplifycfg -phi-node-folding-threshold=2 -S | FileCheck %s 2 3 target 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" 4 target triple = "x86_64-unknown-linux-gnu" 5 6 define i32 @test1(i32 %a, i32 %b, i32 %c) nounwind { 7 ; CHECK: @test1 8 entry: 9 %tmp1 = icmp eq i32 %b, 0 10 br i1 %tmp1, label %bb1, label %bb3 11 12 bb1: ; 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 21 bb2: ; preds = bb1 22 %tmp3 = add i32 %a, 1 23 br label %bb3 24 25 bb3: ; 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 31 declare i8 @llvm.cttz.i8(i8, i1) 32 33 define i8 @test2(i8 %a) { 34 ; CHECK: @test2 35 br i1 undef, label %bb_true, label %bb_false 36 bb_true: 37 %b = tail call i8 @llvm.cttz.i8(i8 %a, i1 false) 38 br label %join 39 bb_false: 40 br label %join 41 join: 42 %c = phi i8 [%b, %bb_true], [%a, %bb_false] 43 ; CHECK: select 44 ret i8 %c 45 } 46 47 define i8* @test4(i1* %dummy, i8* %a, i8* %b) { 48 ; Test that we don't speculate an arbitrarily large number of unfolded constant 49 ; expressions. 50 ; CHECK: @test4 51 52 entry: 53 %cond1 = load volatile i1* %dummy 54 br i1 %cond1, label %if, label %end 55 56 if: 57 %cond2 = load volatile i1* %dummy 58 br i1 %cond2, label %then, label %end 59 60 then: 61 br label %end 62 63 end: 64 %x1 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 1 to i8*), %then ] 65 %x2 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 2 to i8*), %then ] 66 %x3 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 3 to i8*), %then ] 67 %x4 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 4 to i8*), %then ] 68 %x5 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 5 to i8*), %then ] 69 %x6 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 6 to i8*), %then ] 70 %x7 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 7 to i8*), %then ] 71 %x8 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 8 to i8*), %then ] 72 %x9 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 9 to i8*), %then ] 73 %x10 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 10 to i8*), %then ] 74 ; CHECK-NOT: select 75 ; CHECK: phi i8* 76 ; CHECK: phi i8* 77 ; CHECK: phi i8* 78 ; CHECK: phi i8* 79 ; CHECK: phi i8* 80 ; CHECK: phi i8* 81 ; CHECK: phi i8* 82 ; CHECK: phi i8* 83 ; CHECK: phi i8* 84 ; CHECK: phi i8* 85 86 ret i8* %x10 87 } 88
