46 lines
1.5 KiB
LLVM
46 lines
1.5 KiB
LLVM
; RUN: llc -disable-preheader-prot=true -disable-machine-licm -machine-sink-bfi=true -mtriple=x86_64-apple-darwin < %s | FileCheck %s -check-prefix=MSINK_BFI
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; RUN: llc -disable-preheader-prot=true -disable-machine-licm -machine-sink-bfi=false -mtriple=x86_64-apple-darwin < %s | FileCheck %s -check-prefix=MSINK_NOBFI
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; Test that by changing BlockFrequencyInfo we change the order in which
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; machine-sink looks for successor blocks. By not using BFI, both G and B
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; have the same loop depth and no instructions is sinked - B is selected but
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; can't be used as to avoid breaking a non profitable critical edge. By using
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; BFI, "mul" is sinked into the less frequent block G.
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define i32 @sink_freqinfo(i32 %a, i32 %b) nounwind uwtable ssp {
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; MSINK_BFI-LABEL: sink_freqinfo
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; MSINK_BFI: jl
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; MSINK_BFI-NEXT: ## %bb.
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; MSINK_BFI-NEXT: imull
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; MSINK_NOBFI-LABEL: sink_freqinfo
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; MSINK_NOBFI: imull
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; MSINK_NOBFI: jl
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entry:
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br label %B
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B:
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%ee = phi i32 [ 0, %entry ], [ %inc, %F ]
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%xx = sub i32 %a, %ee
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%cond0 = icmp slt i32 %xx, 0
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br i1 %cond0, label %F, label %exit, !prof !0
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F:
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%inc = add nsw i32 %xx, 2
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%aa = mul nsw i32 %b, %inc
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%exitcond = icmp slt i32 %inc, %a
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br i1 %exitcond, label %B, label %G, !prof !1
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G:
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%ii = add nsw i32 %aa, %a
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%ll = add i32 %b, 45
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%exitcond2 = icmp sge i32 %ii, %b
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br i1 %exitcond2, label %G, label %exit, !prof !2
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exit:
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ret i32 0
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}
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!0 = !{!"branch_weights", i32 4, i32 1}
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!1 = !{!"branch_weights", i32 128, i32 1}
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!2 = !{!"branch_weights", i32 1, i32 1}
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