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-LABEL: @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 define 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 36 entry: 37 %cond1 = load volatile i1, i1* %dummy 38 br i1 %cond1, label %if, label %end 39 40 if: 41 %cond2 = load volatile i1, i1* %dummy 42 br i1 %cond2, label %then, label %end 43 44 then: 45 br label %end 46 47 end: 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 73 define 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( 76 entry: 77 %tmp1 = icmp eq i32 %b, 0 78 br i1 %tmp1, label %bb1, label %bb3 79 80 bb1: ; 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 90 bb2: ; preds = bb1 91 %tmp3 = load i32*, i32** %ptr3, !dereferenceable !{i64 10} 92 br label %bb3 93 94 bb3: ; preds = %bb2, %entry 95 %tmp4 = phi i32* [ %ptr1, %entry ], [ %ptr2, %bb1 ], [ %tmp3, %bb2 ] 96 ret i32* %tmp4 97 } 98
