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For inner one of nested loops, it is more likely to be a hot loop, and the runtime check can be promoted out from patch 0001, so the overhead is less, we can try a doubled threshold to unroll more loops. llvm-svn: 231632
77 lines
1.4 KiB
LLVM
77 lines
1.4 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -mtriple aarch64 -mcpu=cortex-a57 | FileCheck %s
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; Partial unroll 8 times for this loop.
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define void @unroll1() nounwind {
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
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%inc = add i32 %iv, 1
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%exitcnd = icmp uge i32 %inc, 1024
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br i1 %exitcnd, label %exit, label %loop
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exit:
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ret void
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}
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; CHECK: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: icmp
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; Partial unroll 16 times for this loop.
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define void @unroll2() nounwind {
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entry:
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br label %loop1
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loop1:
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%iv1 = phi i32 [ 0, %entry ], [ %inc1, %loop1.latch ]
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br label %loop2.header
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loop2.header:
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br label %loop2
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loop2:
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%iv2 = phi i32 [ 0, %loop2.header ], [ %inc2, %loop2 ]
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%inc2 = add i32 %iv2, 1
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%exitcnd2 = icmp uge i32 %inc2, 1024
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br i1 %exitcnd2, label %exit2, label %loop2
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exit2:
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br label %loop1.latch
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loop1.latch:
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%inc1 = add i32 %iv1, 1
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%exitcnd1 = icmp uge i32 %inc1, 1024
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br i1 %exitcnd2, label %exit, label %loop1
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exit:
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ret void
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}
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; CHECK: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: add
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; CHECK-NEXT: icmp
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