1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
2; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
3
4; <rdar://problem/7859988>
5
6; Make sure we don't generate more jumps than we need to. We used to generate
7; something like this:
8;
9;       jne  LBB0_1
10;       jnp  LBB0_2
11;   LBB0_1:
12;       jmp  LBB0_3
13;   LBB0_2:
14;       addsd ...
15;   LBB0_3:
16;
17; Now we generate this:
18;
19;       jne  LBB0_2
20;       jp   LBB0_2
21;       addsd ...
22;   LBB0_2:
23
24define double @rdar_7859988(double %x, double %y) nounwind readnone optsize ssp {
25; CHECK-LABEL: rdar_7859988:
26; CHECK:       # BB#0: # %entry
27; CHECK-NEXT:    mulsd %xmm1, %xmm0
28; CHECK-NEXT:    xorpd %xmm1, %xmm1
29; CHECK-NEXT:    ucomisd %xmm1, %xmm0
30; CHECK-NEXT:    jne .LBB0_2
31; CHECK-NEXT:    jp .LBB0_2
32; CHECK-NEXT:  # BB#1: # %bb1
33; CHECK-NEXT:    addsd {{.*}}(%rip), %xmm0
34; CHECK-NEXT:  .LBB0_2: # %bb2
35; CHECK-NEXT:    retq
36
37entry:
38  %mul = fmul double %x, %y
39  %cmp = fcmp une double %mul, 0.000000e+00
40  br i1 %cmp, label %bb2, label %bb1
41
42bb1:
43  %add = fadd double %mul, -1.000000e+00
44  br label %bb2
45
46bb2:
47  %phi = phi double [ %add, %bb1 ], [ %mul, %entry ]
48  ret double %phi
49}
50
51define double @profile_metadata(double %x, double %y) {
52; CHECK-LABEL: profile_metadata:
53; CHECK:       # BB#0: # %entry
54; CHECK-NEXT:    mulsd %xmm1, %xmm0
55; CHECK-NEXT:    xorpd %xmm1, %xmm1
56; CHECK-NEXT:    ucomisd %xmm1, %xmm0
57; CHECK-NEXT:    jne .LBB1_1
58; CHECK-NEXT:    jp .LBB1_1
59; CHECK-NEXT:  .LBB1_2: # %bb2
60; CHECK-NEXT:    retq
61; CHECK-NEXT:  .LBB1_1: # %bb1
62; CHECK-NEXT:    addsd {{.*}}(%rip), %xmm0
63; CHECK-NEXT:    jmp .LBB1_2
64
65entry:
66  %mul = fmul double %x, %y
67  %cmp = fcmp une double %mul, 0.000000e+00
68  br i1 %cmp, label %bb1, label %bb2, !prof !1
69
70bb1:
71  %add = fadd double %mul, -1.000000e+00
72  br label %bb2
73
74bb2:
75  %phi = phi double [ %add, %bb1 ], [ %mul, %entry ]
76  ret double %phi
77}
78
79; Test if the negation of the non-equality check between floating points are
80; translated to jnp followed by jne.
81
82define void @foo(float %f) {
83; CHECK-LABEL: foo:
84; CHECK:       # BB#0: # %entry
85; CHECK-NEXT:    xorps %xmm1, %xmm1
86; CHECK-NEXT:    ucomiss %xmm1, %xmm0
87; CHECK-NEXT:    jne .LBB2_2
88; CHECK-NEXT:    jnp .LBB2_1
89; CHECK-NEXT:  .LBB2_2: # %if.then
90; CHECK-NEXT:    jmp a # TAILCALL
91; CHECK-NEXT:  .LBB2_1: # %if.end
92; CHECK-NEXT:    retq
93entry:
94  %cmp = fcmp une float %f, 0.000000e+00
95  br i1 %cmp, label %if.then, label %if.end
96
97if.then:
98  tail call void @a()
99  br label %if.end
100
101if.end:
102  ret void
103}
104
105; Test that an FP oeq/une conditional branch can be inverted successfully even
106; when the true and false targets are the same (PR27750).
107;
108; CHECK-LABEL: pr27750
109; CHECK: ucomiss
110; CHECK-NEXT: jne [[TARGET:.*]]
111; CHECK-NEXT: jp [[TARGET]]
112define void @pr27750(i32* %b, float %x, i1 %y) {
113entry:
114  br label %for.cond
115
116for.cond:
117  br label %for.cond1
118
119for.cond1:
120  br i1 %y, label %for.body3.lr.ph, label %for.end
121
122for.body3.lr.ph:
123  store i32 0, i32* %b, align 4
124  br label %for.end
125
126for.end:
127; After block %for.cond gets eliminated, the two target blocks of this
128; conditional block are the same.
129  %tobool = fcmp une float %x, 0.000000e+00
130  br i1 %tobool, label %for.cond, label %for.cond1
131}
132
133declare void @a()
134
135!1 = !{!"branch_weights", i32 1, i32 1000}
136