source: icGREP/icgrep-devel/llvm-3.8.0.src/test/CodeGen/Hexagon/ifcvt-edge-weight.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

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1; RUN: llc -march=hexagon -mcpu=hexagonv5 -hexagon-eif=0 -print-machineinstrs=if-converter %s -o /dev/null 2>&1 | FileCheck %s
2; Check that the edge weights are updated correctly after if-conversion.
3
4; CHECK: BB#3:
5; CHECK: Successors according to CFG: BB#2({{[0-9a-fx/= ]+}}10.00%) BB#1({{[0-9a-fx/= ]+}}90.00%)
6@a = external global i32
7@d = external global i32
8
9; In the following CFG, A,B,C,D will be if-converted into a single block.
10; Check if the edge weights on edges to E and F are maintained correctly.
11;
12;    A
13;   / \
14;  B   C
15;   \ /
16;    D
17;   / \
18;  E   F
19;
20define void @test1(i8 zeroext %la, i8 zeroext %lb) {
21entry:
22  %cmp0 = call i1 @pred()
23  br i1 %cmp0, label %if.else2, label %if.then0, !prof !1
24
25if.else2:
26  call void @bar(i32 2)
27  br label %if.end2
28
29if.end2:
30  call void @foo(i32 2)
31  br label %return
32
33if.end:
34  %storemerge = phi i32 [ %and, %if.else ], [ %shl, %if.then ]
35  store i32 %storemerge, i32* @a, align 4
36  %0 = load i32, i32* @d, align 4
37  %cmp2 = call i1 @pred()
38  br i1 %cmp2, label %if.end2, label %if.else2, !prof !2
39
40if.then0:
41  %cmp = icmp eq i8 %la, %lb
42  br i1 %cmp, label %if.then, label %if.else, !prof !1
43
44if.then:
45  %conv1 = zext i8 %la to i32
46  %shl = shl nuw nsw i32 %conv1, 16
47  br label %if.end
48
49if.else:
50  %and8 = and i8 %lb, %la
51  %and = zext i8 %and8 to i32
52  br label %if.end
53
54return:
55  call void @foo(i32 2)
56  ret void
57}
58
59declare void @foo(i32)
60declare void @bar(i32)
61declare i1 @pred()
62
63!1 = !{!"branch_weights", i32 80, i32 20}
64!2 = !{!"branch_weights", i32 10, i32 90}
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