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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.
20 lines
1.1 KiB
LLVM
20 lines
1.1 KiB
LLVM
; RUN: opt -mtriple=x86_64-- -Os -hot-cold-split=true -debug-pass=Structure -enable-new-pm=0 < %s -o /dev/null 2>&1 | FileCheck %s -check-prefix=DEFAULT-Os
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; RUN: opt -mtriple=x86_64-- -hot-cold-split=true -passes='lto-pre-link<Os>' -debug-pass-manager < %s -o /dev/null 2>&1 | FileCheck %s -check-prefix=LTO-PRELINK-Os
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; RUN: opt -mtriple=x86_64-- -hot-cold-split=true -passes='thinlto-pre-link<Os>' -debug-pass-manager < %s -o /dev/null 2>&1 | FileCheck %s -check-prefix=THINLTO-PRELINK-Os
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; RUN: opt -mtriple=x86_64-- -hot-cold-split=true -passes='lto<Os>' -debug-pass-manager < %s -o /dev/null 2>&1 | FileCheck %s -check-prefix=LTO-POSTLINK-Os
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; RUN: opt -mtriple=x86_64-- -hot-cold-split=true -passes='thinlto<Os>' -debug-pass-manager < %s -o /dev/null 2>&1 | FileCheck %s -check-prefix=THINLTO-POSTLINK-Os
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; REQUIRES: asserts
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; Splitting should occur late.
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; DEFAULT-Os: Hot Cold Splitting
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; DEFAULT-Os: Simplify the CFG
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; LTO-PRELINK-Os-NOT: pass: HotColdSplittingPass
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; THINLTO-PRELINK-Os-NOT: Running pass: HotColdSplittingPass
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; LTO-POSTLINK-Os: HotColdSplitting
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; THINLTO-POSTLINK-Os: HotColdSplitting
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