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f6eeeaf04e
This broke Chromium's PGO build, it seems because hot-cold-splitting got turned on unintentionally. See comment on the code review for repro etc. > This patch adds -f[no-]split-cold-code CC1 options to clang. This allows > the splitting pass to be toggled on/off. The current method of passing > `-mllvm -hot-cold-split=true` to clang isn't ideal as it may not compose > correctly (say, with `-O0` or `-Oz`). > > To implement the -fsplit-cold-code option, an attribute is applied to > functions to indicate that they may be considered for splitting. This > removes some complexity from the old/new PM pipeline builders, and > behaves as expected when LTO is enabled. > > Co-authored by: Saleem Abdulrasool <compnerd@compnerd.org> > Differential Revision: https://reviews.llvm.org/D57265 > Reviewed By: Aditya Kumar, Vedant Kumar > Reviewers: Teresa Johnson, Aditya Kumar, Fedor Sergeev, Philip Pfaffe, Vedant Kumar This reverts commit 273c299d5d649a0222fbde03c9a41e41913751b4.
54 lines
1006 B
LLVM
54 lines
1006 B
LLVM
; REQUIRES: asserts
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; RUN: opt -hotcoldsplit -debug-only=hotcoldsplit -S < %s -o /dev/null 2>&1 | FileCheck %s
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declare void @sink() cold
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; CHECK-LABEL: Outlining in one_non_region_successor
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define void @one_non_region_successor(i32 %arg) {
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entry:
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br i1 undef, label %cold1, label %exit
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cold1:
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; CHECK: Applying penalty for: 1 non-region successor
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call void @sink()
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br i1 undef, label %cold2, label %cold3
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cold2:
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br i1 undef, label %cold4, label %exit
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cold3:
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br i1 undef, label %cold4, label %exit
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cold4:
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unreachable
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exit:
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ret void
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}
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; CHECK-LABEL: Outlining in two_non_region_successor
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define void @two_non_region_successors(i32 %arg) {
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entry:
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br i1 undef, label %cold1, label %exit1
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cold1:
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; CHECK: Applying penalty for: 2 non-region successors
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call void @sink()
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br i1 undef, label %cold2, label %cold3
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cold2:
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br i1 undef, label %cold4, label %exit1
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cold3:
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br i1 undef, label %cold4, label %exit2
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cold4:
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unreachable
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exit1:
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br label %exit2
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exit2:
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ret void
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}
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