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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
399 B
LLVM
20 lines
399 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(i32*, i32, i32) cold
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@g = global i32 0
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define void @foo(i32 %arg) {
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%local = load i32, i32* @g
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br i1 undef, label %cold, label %exit
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cold:
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; CHECK: Applying penalty for: 2 inputs
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call void @sink(i32* @g, i32 %arg, i32 %local)
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ret void
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exit:
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ret void
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}
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