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-LABEL: @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 31define i8* @test4(i1* %dummy, i8* %a, i8* %b) { 32; Test that we don't speculate an arbitrarily large number of unfolded constant 33; expressions. 34; CHECK-LABEL: @test4( 35 36entry: 37 %cond1 = load volatile i1, i1* %dummy 38 br i1 %cond1, label %if, label %end 39 40if: 41 %cond2 = load volatile i1, i1* %dummy 42 br i1 %cond2, label %then, label %end 43 44then: 45 br label %end 46 47end: 48 %x1 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 1 to i8*), %then ] 49 %x2 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 2 to i8*), %then ] 50 %x3 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 3 to i8*), %then ] 51 %x4 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 4 to i8*), %then ] 52 %x5 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 5 to i8*), %then ] 53 %x6 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 6 to i8*), %then ] 54 %x7 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 7 to i8*), %then ] 55 %x8 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 8 to i8*), %then ] 56 %x9 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 9 to i8*), %then ] 57 %x10 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 10 to i8*), %then ] 58; CHECK-NOT: select 59; CHECK: phi i8* 60; CHECK: phi i8* 61; CHECK: phi i8* 62; CHECK: phi i8* 63; CHECK: phi i8* 64; CHECK: phi i8* 65; CHECK: phi i8* 66; CHECK: phi i8* 67; CHECK: phi i8* 68; CHECK: phi i8* 69 70 ret i8* %x10 71} 72 73define i32* @test5(i32 %a, i32 %b, i32 %c, i32* dereferenceable(10) %ptr1, 74 i32* dereferenceable(10) %ptr2, i32** dereferenceable(10) %ptr3) nounwind { 75; CHECK-LABEL: @test5( 76entry: 77 %tmp1 = icmp eq i32 %b, 0 78 br i1 %tmp1, label %bb1, label %bb3 79 80bb1: ; preds = %entry 81 %tmp2 = icmp sgt i32 %c, 1 82 br i1 %tmp2, label %bb2, label %bb3 83; CHECK: bb1: 84; CHECK-NEXT: icmp sgt i32 %c, 1 85; CHECK-NEXT: load i32*, i32** %ptr3 86; CHECK-NOT: dereferenceable 87; CHECK-NEXT: select i1 %tmp2, i32* %tmp3, i32* %ptr2 88; CHECK-NEXT: ret i32* %tmp3.ptr2 89 90bb2: ; preds = bb1 91 %tmp3 = load i32*, i32** %ptr3, !dereferenceable !{i64 10} 92 br label %bb3 93 94bb3: ; preds = %bb2, %entry 95 %tmp4 = phi i32* [ %ptr1, %entry ], [ %ptr2, %bb1 ], [ %tmp3, %bb2 ] 96 ret i32* %tmp4 97} 98