113 lines
4.0 KiB
LLVM
113 lines
4.0 KiB
LLVM
; REQUIRES: asserts
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;
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; The Cortext-A57 machine model will avoid scheduling load instructions in
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; succession because loads on the A57 have a latency of 4 cycles and they all
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; issue to the same pipeline. Instead, it will move other instructions between
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; the loads to avoid unnecessary stalls. The generic machine model schedules 4
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; loads consecutively for this case and will cause stalls.
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;
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; RUN: llc < %s -mtriple=arm64-linux-gnu -mcpu=cortex-a57 -enable-misched -verify-misched -debug-only=misched -o - 2>&1 > /dev/null | FileCheck %s
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; CHECK: ********** MI Scheduling **********
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; CHECK: main:BB#2
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; CHECK: LDR
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; CHECK: Latency : 4
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; CHECK: *** Final schedule for BB#2 ***
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; CHECK: LDR
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; CHECK: LDR
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; CHECK-NOT: LDR
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; CHECK: {{.*}}
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; CHECK: ********** MI Scheduling **********
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@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
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@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
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; Function Attrs: nounwind
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define i32 @main() #0 {
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entry:
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%retval = alloca i32, align 4
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%x = alloca [8 x i32], align 4
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%y = alloca [8 x i32], align 4
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%i = alloca i32, align 4
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%xx = alloca i32, align 4
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%yy = alloca i32, align 4
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store i32 0, i32* %retval
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%0 = bitcast [8 x i32]* %x to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast ([8 x i32]* @main.x to i8*), i64 32, i32 4, i1 false)
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%1 = bitcast [8 x i32]* %y to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* bitcast ([8 x i32]* @main.y to i8*), i64 32, i32 4, i1 false)
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store i32 0, i32* %xx, align 4
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store i32 0, i32* %yy, align 4
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store i32 0, i32* %i, align 4
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%2 = load i32, i32* %i, align 4
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%cmp = icmp slt i32 %2, 8
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%3 = load i32, i32* %yy, align 4
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%4 = load i32, i32* %i, align 4
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%idxprom = sext i32 %4 to i64
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%arrayidx = getelementptr inbounds [8 x i32], [8 x i32]* %x, i32 0, i64 %idxprom
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%5 = load i32, i32* %arrayidx, align 4
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%add = add nsw i32 %5, 1
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store i32 %add, i32* %xx, align 4
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%6 = load i32, i32* %xx, align 4
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%add1 = add nsw i32 %6, 12
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store i32 %add1, i32* %xx, align 4
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%7 = load i32, i32* %xx, align 4
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%add2 = add nsw i32 %7, 23
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store i32 %add2, i32* %xx, align 4
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%8 = load i32, i32* %xx, align 4
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%add3 = add nsw i32 %8, 34
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store i32 %add3, i32* %xx, align 4
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%9 = load i32, i32* %i, align 4
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%idxprom4 = sext i32 %9 to i64
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%arrayidx5 = getelementptr inbounds [8 x i32], [8 x i32]* %y, i32 0, i64 %idxprom4
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%10 = load i32, i32* %arrayidx5, align 4
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%add4 = add nsw i32 %9, %add
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%add5 = add nsw i32 %10, %add1
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%add6 = add nsw i32 %add4, %add5
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%add7 = add nsw i32 %9, %add3
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%add8 = add nsw i32 %10, %add4
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%add9 = add nsw i32 %add7, %add8
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%add10 = add nsw i32 %9, %add6
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%add11 = add nsw i32 %10, %add7
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%add12 = add nsw i32 %add10, %add11
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%add13 = add nsw i32 %9, %add9
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%add14 = add nsw i32 %10, %add10
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%add15 = add nsw i32 %add13, %add14
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store i32 %add15, i32* %xx, align 4
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%div = sdiv i32 %4, %5
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store i32 %div, i32* %yy, align 4
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br label %for.inc
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for.inc: ; preds = %for.body
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%11 = load i32, i32* %i, align 4
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%inc = add nsw i32 %11, 1
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store i32 %inc, i32* %i, align 4
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br label %for.cond
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for.end: ; preds = %for.cond
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%12 = load i32, i32* %xx, align 4
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%13 = load i32, i32* %yy, align 4
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%add67 = add nsw i32 %12, %13
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ret i32 %add67
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}
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; Function Attrs: nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #1
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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" }
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attributes #1 = { nounwind }
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