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2c542e21a7
Algorithm: Identify maximal cold regions and put them in a worklist. If a candidate region overlaps with another, discard it. While the worklist is full, remove a single-entry sub-region from the worklist and attempt to outline it. By the non-overlap property, this should not invalidate parts of the domtree pertaining to other outlining regions. Testing: LNT results on X86 are clean. With test-suite + externals, llvm outlines 134KB pre-patch, and 352KB post-patch (+ ~2.6x). The file 483.xalancbmk/src/Constants.cpp stands out as an extreme case where llvm outlines over 100 times in some functions (mostly EH paths). There was not a significant performance impact pre vs. post-patch. Differential Revision: https://reviews.llvm.org/D53887 llvm-svn: 348639
30 lines
618 B
LLVM
30 lines
618 B
LLVM
; RUN: opt -hotcoldsplit -S < %s | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.14.0"
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; CHECK-LABEL: define {{.*}}@fun
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; CHECK: call {{.*}}@fun.cold.1(
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define void @fun() {
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entry:
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br i1 undef, label %if.then, label %if.else
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if.then:
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; This will be marked by the inverse DFS on sink-predecesors.
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br label %sink
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sink:
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call void @sink()
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; Do not allow the forward-DFS on sink-successors to mark the block again.
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br i1 undef, label %if.then, label %if.then.exit
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if.then.exit:
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ret void
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if.else:
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ret void
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}
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declare void @sink() cold
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