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If a block has N predecessors, then the current algorithm will try to sink common code to this block N times (whenever we visit a predecessor). Every attempt to sink the common code includes going through all predecessors, so the complexity of the algorithm becomes O(N^2). With this patch we try to sink common code only when we visit the block itself. With this, the complexity goes down to O(N). As a side effect, the moment the code is sunk is slightly different than before (the order of simplifications has been changed), that's why I had to adjust two tests (note that neither of the tests is supposed to test SimplifyCFG): * test/CodeGen/AArch64/arm64-jumptable.ll - changes in this test mimic the changes that previous implementation of SimplifyCFG would do. * test/CodeGen/ARM/avoid-cpsr-rmw.ll - in this test I disabled common code sinking by a command line flag. llvm-svn: 321236
35 lines
882 B
LLVM
35 lines
882 B
LLVM
; RUN: llc -mtriple=arm64-apple-ios < %s | FileCheck %s
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; RUN: llc -mtriple=arm64-linux-gnu < %s | FileCheck %s --check-prefix=CHECK-LINUX
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; <rdar://11417675>
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define void @sum(i32 %a, i32* %to, i32 %c) {
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entry:
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switch i32 %a, label %exit [
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i32 1, label %bb1
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i32 2, label %exit.sink.split
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i32 3, label %bb3
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i32 4, label %bb4
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]
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bb1:
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%b = add i32 %c, 1
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br label %exit.sink.split
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bb3:
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br label %exit.sink.split
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bb4:
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br label %exit.sink.split
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exit.sink.split:
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%.sink = phi i32 [ 5, %bb4 ], [ %b, %bb1 ], [ 3, %bb3 ], [ %a, %entry ]
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store i32 %.sink, i32* %to
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: sum:
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; CHECK: adrp {{x[0-9]+}}, LJTI0_0@PAGE
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; CHECK: add {{x[0-9]+}}, {{x[0-9]+}}, LJTI0_0@PAGEOFF
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; CHECK-LINUX-LABEL: sum:
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; CHECK-LINUX: adrp {{x[0-9]+}}, .LJTI0_0
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; CHECK-LINUX: add {{x[0-9]+}}, {{x[0-9]+}}, :lo12:.LJTI0_0
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