0628bea513
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 273c299d5d.
43 lines
915 B
LLVM
43 lines
915 B
LLVM
; RUN: opt -hotcoldsplit -hotcoldsplit-threshold=0 -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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; Do not split out `resume` instructions.
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; CHECK-LABEL: define {{.*}}@foo.cold.1(
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; CHECK: call {{.*}}@sink(
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; CHECK-NOT: resume i32 undef
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; CHECK-NOT: noreturn
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define i32 @foo() personality i8 0 {
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entry:
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invoke void @llvm.donothing() to label %normal unwind label %exception
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exception:
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%cleanup = landingpad i32 cleanup
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br i1 undef, label %normal, label %continue_exception
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continue_exception:
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call void @sideeffect(i32 0)
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call void @sink()
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br label %resume-eh
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resume-eh:
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resume i32 undef
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normal:
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br i1 undef, label %continue_exception, label %exit
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exit:
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call void @sideeffect(i32 2)
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ret i32 0
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}
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declare void @sideeffect(i32)
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declare void @sink() cold
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declare void @llvm.donothing() nounwind readnone
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