2 ; There should be just a single copy of each loop when strictest mutiplier
3 ; candidates formula (unscaled candidates == 0) is enforced:
5 ; RUN: opt < %s -enable-unswitch-cost-multiplier=true \
6 ; RUN: -unswitch-num-initial-unscaled-candidates=0 -unswitch-siblings-toplevel-div=1 \
7 ; RUN: -passes='loop(unswitch<nontrivial>),print<loops>' -disable-output 2>&1 | FileCheck %s --check-prefixes=LOOP1
9 ; RUN: opt < %s -enable-unswitch-cost-multiplier=true \
10 ; RUN: -unswitch-num-initial-unscaled-candidates=0 -unswitch-siblings-toplevel-div=16 \
11 ; RUN: -passes='loop(unswitch<nontrivial>),print<loops>' -disable-output 2>&1 | FileCheck %s --check-prefixes=LOOP1
14 ; When we relax the candidates part of a multiplier formula
15 ; (unscaled candidates == 4) we start getting some unswitches,
16 ; which leads to siblings multiplier kicking in.
18 ; RUN: opt < %s -enable-unswitch-cost-multiplier=true \
19 ; RUN: -unswitch-num-initial-unscaled-candidates=4 -unswitch-siblings-toplevel-div=1 \
20 ; RUN: -passes='loop(unswitch<nontrivial>),print<loops>' -disable-output 2>&1 | \
21 ; RUN: sort -b -k 1 | FileCheck %s --check-prefixes=LOOP-UNSCALE4-DIV1
23 ; NB: sort -b is essential here and below, otherwise blanks might lead to different
24 ; order depending on locale.
26 ; RUN: opt < %s -enable-unswitch-cost-multiplier=true \
27 ; RUN: -unswitch-num-initial-unscaled-candidates=4 -unswitch-siblings-toplevel-div=2 \
28 ; RUN: -passes='loop(unswitch<nontrivial>),print<loops>' -disable-output 2>&1 | \
29 ; RUN: sort -b -k 1 | FileCheck %s --check-prefixes=LOOP-UNSCALE4-DIV2
33 ; 2^(num conds) == 2^5 = 32
34 ; loop nests when cost multiplier is disabled:
36 ; RUN: opt < %s -enable-unswitch-cost-multiplier=false \
37 ; RUN: -passes='loop(unswitch<nontrivial>),print<loops>' -disable-output 2>&1 | \
38 ; RUN: sort -b -k 1 | FileCheck %s --check-prefixes=LOOP32
40 ; Single loop nest, not unswitched
41 ; LOOP1: Loop at depth 1 containing:
42 ; LOOP1: Loop at depth 2 containing:
43 ; LOOP1: Loop at depth 3 containing:
44 ; LOOP1-NOT: Loop at depth {{[0-9]+}} containing:
46 ; Half unswitched loop nests, with unscaled4 and div1 it gets less depth1 loops unswitched
47 ; since they have more cost.
48 ; LOOP-UNSCALE4-DIV1-COUNT-6: Loop at depth 1 containing:
49 ; LOOP-UNSCALE4-DIV1-COUNT-19: Loop at depth 2 containing:
50 ; LOOP-UNSCALE4-DIV1-COUNT-29: Loop at depth 3 containing:
51 ; LOOP-UNSCALE4-DIV1-NOT: Loop at depth {{[0-9]+}} containing:
53 ; Half unswitched loop nests, with unscaled4 and div2 it gets more depth1 loops unswitched
55 ; LOOP-UNSCALE4-DIV2-COUNT-11: Loop at depth 1 containing:
56 ; LOOP-UNSCALE4-DIV2-COUNT-22: Loop at depth 2 containing:
57 ; LOOP-UNSCALE4-DIV2-COUNT-29: Loop at depth 3 containing:
58 ; LOOP-UNSCALE4-DIV2-NOT: Loop at depth {{[0-9]+}} containing:
60 ; 32 loop nests, fully unswitched
61 ; LOOP32-COUNT-32: Loop at depth 1 containing:
62 ; LOOP32-COUNT-32: Loop at depth 2 containing:
63 ; LOOP32-COUNT-32: Loop at depth 3 containing:
64 ; LOOP32-NOT: Loop at depth {{[0-9]+}} containing:
68 define void @loop_nested3_conds5(i32* %addr, i1 %c1, i1 %c2, i1 %c3, i1 %c4, i1 %c5) {
70 %addr1 = getelementptr i32, i32* %addr, i64 0
71 %addr2 = getelementptr i32, i32* %addr, i64 1
72 %addr3 = getelementptr i32, i32* %addr, i64 2
75 %iv1 = phi i32 [0, %entry], [%iv1.next, %outer_latch]
76 %iv1.next = add i32 %iv1, 1
77 ;; skip nontrivial unswitch
81 %iv2 = phi i32 [0, %outer], [%iv2.next, %middle_latch]
82 %iv2.next = add i32 %iv2, 1
83 ;; skip nontrivial unswitch
87 %iv3 = phi i32 [0, %middle], [%iv3.next, %loop_latch]
88 %iv3.next = add i32 %iv3, 1
89 ;; skip nontrivial unswitch
91 br i1 %c1, label %loop_next1_left, label %loop_next1_right
98 br i1 %c2, label %loop_next2_left, label %loop_next2_right
105 br i1 %c3, label %loop_next3_left, label %loop_next3_right
112 br i1 %c4, label %loop_next4_left, label %loop_next4_right
119 br i1 %c5, label %loop_latch_left, label %loop_latch_right
126 store volatile i32 0, i32* %addr1
127 %test_loop = icmp slt i32 %iv3, 50
128 br i1 %test_loop, label %loop, label %middle_latch
130 store volatile i32 0, i32* %addr2
131 %test_middle = icmp slt i32 %iv2, 50
132 br i1 %test_middle, label %middle, label %outer_latch
134 store volatile i32 0, i32* %addr3
135 %test_outer = icmp slt i32 %iv1, 50
136 br i1 %test_outer, label %outer, label %exit