1 ; RUN: opt < %s -simplifycfg -phi-node-folding-threshold=2 -S | FileCheck %s
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"
6 define i32 @test1(i32 %a, i32 %b, i32 %c) nounwind {
9 %tmp1 = icmp eq i32 %b, 0
10 br i1 %tmp1, label %bb1, label %bb3
13 %tmp2 = icmp sgt i32 %c, 1
14 br i1 %tmp2, label %bb2, label %bb3
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
25 bb3: ; preds = %bb2, %entry
26 %tmp4 = phi i32 [ %b, %entry ], [ %a, %bb1 ], [ %tmp3, %bb2 ]
27 %tmp5 = sub i32 %tmp4, 1
31 declare i8 @llvm.cttz.i8(i8, i1)
33 define i8 @test2(i8 %a) {
35 br i1 undef, label %bb_true, label %bb_false
37 %b = tail call i8 @llvm.cttz.i8(i8 %a, i1 false)
42 %c = phi i8 [%b, %bb_true], [%a, %bb_false]
47 define i8* @test3(i1* %dummy, i8* %a, i8* %b) {
48 ; Test that a weird, unfolded constant cast in the PHI don't block speculation.
52 %cond1 = load volatile i1* %dummy
53 br i1 %cond1, label %if, label %end
56 %cond2 = load volatile i1* %dummy
57 br i1 %cond2, label %then, label %end
63 %x = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 42 to i8*), %then ]
65 ; CHECK: select i1 %cond2, i8* inttoptr
70 define i8* @test4(i1* %dummy, i8* %a, i8* %b) {
71 ; Test that we don't speculate an arbitrarily large number of unfolded constant
76 %cond1 = load volatile i1* %dummy
77 br i1 %cond1, label %if, label %end
80 %cond2 = load volatile i1* %dummy
81 br i1 %cond2, label %then, label %end
87 %x1 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 1 to i8*), %then ]
88 %x2 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 2 to i8*), %then ]
89 %x3 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 3 to i8*), %then ]
90 %x4 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 4 to i8*), %then ]
91 %x5 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 5 to i8*), %then ]
92 %x6 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 6 to i8*), %then ]
93 %x7 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 7 to i8*), %then ]
94 %x8 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 8 to i8*), %then ]
95 %x9 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 9 to i8*), %then ]
96 %x10 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 10 to i8*), %then ]
112 define i16 @test5(i1* %dummy, i16 %a, i16 %b) {
113 ; Test that we speculate no-op instructions.
117 %cond1 = load volatile i1* %dummy
118 br i1 %cond1, label %if, label %end
121 %cond2 = load volatile i1* %dummy
122 %a.conv = sext i16 %a to i32
123 %b.conv = sext i16 %b to i32
124 %cmp = icmp ult i32 %a.conv, %b.conv
125 br i1 %cond2, label %then, label %end
128 %sub = sub i32 %a.conv, %b.conv
129 %sub.conv = trunc i32 %sub to i16
133 %x = phi i16 [ %a, %entry ], [ %b, %if ], [ %sub.conv, %then ]