1; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a9 -simplifycfg-sink-common=false | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-CORTEX
2; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=swift     -simplifycfg-sink-common=false | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-SWIFT
3; Avoid some 's' 16-bit instruction which partially update CPSR (and add false
4; dependency) when it isn't dependent on last CPSR defining instruction.
5; rdar://8928208
6
7define i32 @t1(i32 %a, i32 %b, i32 %c, i32 %d) nounwind readnone {
8 entry:
9; CHECK-LABEL: t1:
10; CHECK-CORTEX: muls [[REG:(r[0-9]+)]], r3, r2
11; CHECK-CORTEX-NEXT: mul  [[REG2:(r[0-9]+)]], r1, r0
12; CHECK-SWIFT: muls  [[REG2:(r[0-9]+)]], r1, r0
13; CHECK-SWIFT-NEXT: mul [[REG:(r[0-9]+)]], r2, r3
14; CHECK-NEXT: muls r0, [[REG]], [[REG2]]
15  %0 = mul nsw i32 %a, %b
16  %1 = mul nsw i32 %c, %d
17  %2 = mul nsw i32 %0, %1
18  ret i32 %2
19}
20
21; Avoid partial CPSR dependency via loop backedge.
22; rdar://10357570
23define void @t2(i32* nocapture %ptr1, i32* %ptr2, i32 %c) nounwind {
24entry:
25; CHECK-LABEL: t2:
26  br label %while.body
27
28while.body:
29; CHECK: while.body
30; CHECK: mul r{{[0-9]+}}
31; CHECK-NOT: muls
32  %ptr1.addr.09 = phi i32* [ %add.ptr, %while.body ], [ %ptr1, %entry ]
33  %ptr2.addr.08 = phi i32* [ %incdec.ptr, %while.body ], [ %ptr2, %entry ]
34  %0 = load i32, i32* %ptr1.addr.09, align 4
35  %arrayidx1 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 1
36  %1 = load i32, i32* %arrayidx1, align 4
37  %arrayidx3 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 2
38  %2 = load i32, i32* %arrayidx3, align 4
39  %arrayidx4 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 3
40  %3 = load i32, i32* %arrayidx4, align 4
41  %add.ptr = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 4
42  %mul = mul i32 %1, %0
43  %mul5 = mul i32 %mul, %2
44  %mul6 = mul i32 %mul5, %3
45  store i32 %mul6, i32* %ptr2.addr.08, align 4
46  %incdec.ptr = getelementptr inbounds i32, i32* %ptr2.addr.08, i32 -1
47  %tobool = icmp eq i32* %incdec.ptr, null
48  br i1 %tobool, label %while.end, label %while.body
49
50while.end:
51  ret void
52}
53
54; Allow partial CPSR dependency when code size is the priority.
55; rdar://12878928
56define void @t3(i32* nocapture %ptr1, i32* %ptr2, i32 %c) nounwind minsize {
57entry:
58; CHECK-LABEL: t3:
59  br label %while.body
60
61while.body:
62; CHECK: while.body
63; CHECK: mul r{{[0-9]+}}
64; CHECK: muls
65  %ptr1.addr.09 = phi i32* [ %add.ptr, %while.body ], [ %ptr1, %entry ]
66  %ptr2.addr.08 = phi i32* [ %incdec.ptr, %while.body ], [ %ptr2, %entry ]
67  %0 = load i32, i32* %ptr1.addr.09, align 4
68  %arrayidx1 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 1
69  %1 = load i32, i32* %arrayidx1, align 4
70  %arrayidx3 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 2
71  %2 = load i32, i32* %arrayidx3, align 4
72  %arrayidx4 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 3
73  %3 = load i32, i32* %arrayidx4, align 4
74  %add.ptr = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 4
75  %mul = mul i32 %1, %0
76  %mul5 = mul i32 %mul, %2
77  %mul6 = mul i32 %mul5, %3
78  store i32 %mul6, i32* %ptr2.addr.08, align 4
79  %incdec.ptr = getelementptr inbounds i32, i32* %ptr2.addr.08, i32 -1
80  %tobool = icmp eq i32* %incdec.ptr, null
81  br i1 %tobool, label %while.end, label %while.body
82
83while.end:
84  ret void
85}
86
87; Avoid producing tMOVi8 after a high-latency flag-setting operation.
88; <rdar://problem/13468102>
89define void @t4(i32* nocapture %p, double* nocapture %q) {
90entry:
91; CHECK: t4
92; CHECK: vmrs APSR_nzcv, fpscr
93; CHECK: if.then
94; CHECK-NOT: movs
95  %0 = load double, double* %q, align 4
96  %cmp = fcmp olt double %0, 1.000000e+01
97  %incdec.ptr1 = getelementptr inbounds i32, i32* %p, i32 1
98  br i1 %cmp, label %if.then, label %if.else
99
100if.then:
101  store i32 7, i32* %p, align 4
102  %incdec.ptr2 = getelementptr inbounds i32, i32* %p, i32 2
103  store i32 8, i32* %incdec.ptr1, align 4
104  store i32 9, i32* %incdec.ptr2, align 4
105  br label %if.end
106
107if.else:
108  store i32 3, i32* %p, align 4
109  %incdec.ptr5 = getelementptr inbounds i32, i32* %p, i32 3
110  store i32 5, i32* %incdec.ptr1, align 4
111  store i32 6, i32* %incdec.ptr5, align 4
112  br label %if.end
113
114if.end:
115  ret void
116}
117