1 ; RUN: llc < %s -x86-early-ifcvt -stress-early-ifcvt | FileCheck %s
2 target triple = "x86_64-apple-macosx10.8.0"
5 define i32 @mm2(i32* nocapture %p, i32 %n) nounwind uwtable readonly ssp {
10 ; Loop body has no branches before the backedge.
13 %max.0 = phi i32 [ 0, %entry ], [ %max.1, %do.cond ]
14 %min.0 = phi i32 [ 0, %entry ], [ %min.1, %do.cond ]
15 %n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %do.cond ]
16 %p.addr.0 = phi i32* [ %p, %entry ], [ %incdec.ptr, %do.cond ]
17 %incdec.ptr = getelementptr inbounds i32, i32* %p.addr.0, i64 1
18 %0 = load i32, i32* %p.addr.0, align 4
19 %cmp = icmp sgt i32 %0, %max.0
20 br i1 %cmp, label %do.cond, label %if.else
23 %cmp1 = icmp slt i32 %0, %min.0
24 %.min.0 = select i1 %cmp1, i32 %0, i32 %min.0
28 %max.1 = phi i32 [ %0, %do.body ], [ %max.0, %if.else ]
29 %min.1 = phi i32 [ %min.0, %do.body ], [ %.min.0, %if.else ]
32 %dec = add i32 %n.addr.0, -1
33 %tobool = icmp eq i32 %dec, 0
34 br i1 %tobool, label %do.end, label %do.body
37 %sub = sub nsw i32 %max.1, %min.1
42 ; Deal with alternative tail predecessors
50 define void @multipreds(i32 %sw) nounwind uwtable ssp {
52 switch i32 %sw, label %if.then29 [
53 i32 0, label %if.then37
54 i32 127, label %if.end41
64 %exit_status.0 = phi i32 [ 2, %if.then29 ], [ 0, %if.then37 ], [ 66, %entry ]
65 call void (...) @fprintf(i32 %exit_status.0) nounwind
69 declare void @fprintf(...) nounwind
71 ; CHECK: BZ2_decompress
72 ; This test case contains irreducible control flow, so MachineLoopInfo doesn't
73 ; recognize the cycle in the CFG. This would confuse MachineTraceMetrics.
74 define void @BZ2_decompress(i8* %s) nounwind ssp {
76 switch i32 undef, label %sw.default [
77 i32 39, label %if.end.sw.bb2050_crit_edge
78 i32 36, label %sw.bb1788
79 i32 37, label %if.end.sw.bb1855_crit_edge
80 i32 40, label %sw.bb2409
81 i32 38, label %sw.bb1983
82 i32 44, label %if.end.sw.bb3058_crit_edge
85 if.end.sw.bb3058_crit_edge: ; preds = %entry
86 br label %save_state_and_return
88 if.end.sw.bb1855_crit_edge: ; preds = %entry
89 br label %save_state_and_return
91 if.end.sw.bb2050_crit_edge: ; preds = %entry
94 sw.bb1788: ; preds = %entry
95 br label %save_state_and_return
97 sw.bb1983: ; preds = %entry
98 br i1 undef, label %save_state_and_return, label %if.then1990
100 if.then1990: ; preds = %sw.bb1983
101 br label %while.body2038
103 while.body2038: ; preds = %sw.bb2050, %if.then1990
104 %groupPos.8 = phi i32 [ 0, %if.then1990 ], [ %groupPos.9, %sw.bb2050 ]
105 br i1 undef, label %save_state_and_return, label %if.end2042
107 if.end2042: ; preds = %while.body2038
108 br i1 undef, label %if.end2048, label %while.end2104
110 if.end2048: ; preds = %if.end2042
111 %bsLive2054.pre = getelementptr inbounds i8, i8* %s, i32 8
114 sw.bb2050: ; preds = %if.end2048, %if.end.sw.bb2050_crit_edge
115 %groupPos.9 = phi i32 [ 0, %if.end.sw.bb2050_crit_edge ], [ %groupPos.8, %if.end2048 ]
116 %and2064 = and i32 undef, 1
117 br label %while.body2038
119 while.end2104: ; preds = %if.end2042
120 br i1 undef, label %save_state_and_return, label %if.end2117
122 if.end2117: ; preds = %while.end2104
123 br i1 undef, label %while.body2161.lr.ph, label %while.body2145.lr.ph
125 while.body2145.lr.ph: ; preds = %if.end2117
126 br label %save_state_and_return
128 while.body2161.lr.ph: ; preds = %if.end2117
129 br label %save_state_and_return
131 sw.bb2409: ; preds = %entry
132 br label %save_state_and_return
134 sw.default: ; preds = %entry
135 call void @BZ2_bz__AssertH__fail() nounwind
136 br label %save_state_and_return
138 save_state_and_return:
139 %groupPos.14 = phi i32 [ 0, %sw.default ], [ %groupPos.8, %while.body2038 ], [ %groupPos.8, %while.end2104 ], [ 0, %if.end.sw.bb3058_crit_edge ], [ 0, %if.end.sw.bb1855_crit_edge ], [ %groupPos.8, %while.body2161.lr.ph ], [ %groupPos.8, %while.body2145.lr.ph ], [ 0, %sw.bb2409 ], [ 0, %sw.bb1788 ], [ 0, %sw.bb1983 ]
140 store i32 %groupPos.14, i32* undef, align 4
144 declare void @BZ2_bz__AssertH__fail()
146 ; Make sure we don't speculate on div/idiv instructions
149 define i32 @test_idiv(i32 %a, i32 %b) nounwind uwtable readnone ssp {
150 %1 = icmp eq i32 %b, 0
151 br i1 %1, label %4, label %2
153 ; <label>:2 ; preds = %0
157 ; <label>:4 ; preds = %0, %2
158 %5 = phi i32 [ %3, %2 ], [ %a, %0 ]
164 define i32 @test_div(i32 %a, i32 %b) nounwind uwtable readnone ssp {
165 %1 = icmp eq i32 %b, 0
166 br i1 %1, label %4, label %2
168 ; <label>:2 ; preds = %0
172 ; <label>:4 ; preds = %0, %2
173 %5 = phi i32 [ %3, %2 ], [ %a, %0 ]