3 ; The Cortext-A57 machine model will avoid scheduling load instructions in
4 ; succession because loads on the A57 have a latency of 4 cycles and they all
5 ; issue to the same pipeline. Instead, it will move other instructions between
6 ; the loads to avoid unnecessary stalls. The generic machine model schedules 4
7 ; loads consecutively for this case and will cause stalls.
9 ; RUN: llc < %s -mtriple=arm64-linux-gnu -mcpu=cortex-a57 -enable-misched -verify-misched -debug-only=machine-scheduler -o - 2>&1 > /dev/null | FileCheck %s
10 ; CHECK: ********** MI Scheduling **********
14 ; CHECK: *** Final schedule for %bb.2 ***
19 ; CHECK: ********** MI Scheduling **********
21 @main.x = private unnamed_addr constant [8 x i32] [i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1], align 4
22 @main.y = private unnamed_addr constant [8 x i32] [i32 2, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2], align 4
24 ; Function Attrs: nounwind
25 define i32 @main() #0 {
27 %retval = alloca i32, align 4
28 %x = alloca [8 x i32], align 4
29 %y = alloca [8 x i32], align 4
30 %i = alloca i32, align 4
31 %xx = alloca i32, align 4
32 %yy = alloca i32, align 4
33 store i32 0, i32* %retval
34 %0 = bitcast [8 x i32]* %x to i8*
35 call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %0, i8* align 4 bitcast ([8 x i32]* @main.x to i8*), i64 32, i1 false)
36 %1 = bitcast [8 x i32]* %y to i8*
37 call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %1, i8* align 4 bitcast ([8 x i32]* @main.y to i8*), i64 32, i1 false)
38 store i32 0, i32* %xx, align 4
39 store i32 0, i32* %yy, align 4
40 store i32 0, i32* %i, align 4
43 for.cond: ; preds = %for.inc, %entry
44 %2 = load i32, i32* %i, align 4
45 %cmp = icmp slt i32 %2, 8
46 br i1 %cmp, label %for.body, label %for.end
48 for.body: ; preds = %for.cond
49 %3 = load i32, i32* %yy, align 4
50 %4 = load i32, i32* %i, align 4
51 %idxprom = sext i32 %4 to i64
52 %arrayidx = getelementptr inbounds [8 x i32], [8 x i32]* %x, i32 0, i64 %idxprom
53 %5 = load i32, i32* %arrayidx, align 4
54 %add = add nsw i32 %5, 1
55 store i32 %add, i32* %xx, align 4
56 %6 = load i32, i32* %xx, align 4
57 %add1 = add nsw i32 %6, 12
58 store i32 %add1, i32* %xx, align 4
59 %7 = load i32, i32* %xx, align 4
60 %add2 = add nsw i32 %7, 23
61 store i32 %add2, i32* %xx, align 4
62 %8 = load i32, i32* %xx, align 4
63 %add3 = add nsw i32 %8, 34
64 store i32 %add3, i32* %xx, align 4
65 %9 = load i32, i32* %i, align 4
66 %idxprom4 = sext i32 %9 to i64
67 %arrayidx5 = getelementptr inbounds [8 x i32], [8 x i32]* %y, i32 0, i64 %idxprom4
68 %10 = load i32, i32* %arrayidx5, align 4
70 %add4 = add nsw i32 %9, %add
71 %add5 = add nsw i32 %10, %add1
72 %add6 = add nsw i32 %add4, %add5
74 %add7 = add nsw i32 %9, %add3
75 %add8 = add nsw i32 %10, %add4
76 %add9 = add nsw i32 %add7, %add8
78 %add10 = add nsw i32 %9, %add6
79 %add11 = add nsw i32 %10, %add7
80 %add12 = add nsw i32 %add10, %add11
82 %add13 = add nsw i32 %9, %add9
83 %add14 = add nsw i32 %10, %add10
84 %add15 = add nsw i32 %add13, %add14
86 store i32 %add15, i32* %xx, align 4
88 %div = sdiv i32 %4, %5
90 store i32 %div, i32* %yy, align 4
94 for.inc: ; preds = %for.body
95 %11 = load i32, i32* %i, align 4
96 %inc = add nsw i32 %11, 1
97 store i32 %inc, i32* %i, align 4
100 for.end: ; preds = %for.cond
101 %12 = load i32, i32* %xx, align 4
102 %13 = load i32, i32* %yy, align 4
103 %add67 = add nsw i32 %12, %13
108 ; Function Attrs: nounwind
109 declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1) #1
111 attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
112 attributes #1 = { nounwind }