273c299d5d
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
32 lines
690 B
LLVM
32 lines
690 B
LLVM
; RUN: opt -hotcoldsplit -hotcoldsplit-threshold=0 -S < %s | FileCheck %s
|
|
|
|
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-apple-macosx10.14.0"
|
|
|
|
; CHECK-LABEL: @fun
|
|
; CHECK: call void @fun.cold.1
|
|
define void @fun() "hot-cold-split" {
|
|
entry:
|
|
br i1 undef, label %if.then, label %if.else
|
|
|
|
if.then:
|
|
ret void
|
|
|
|
if.else:
|
|
call void @sink()
|
|
ret void
|
|
}
|
|
|
|
; CHECK: define {{.*}} @foo{{.*}}#[[outlined_func_attr:[0-9]+]]
|
|
define void @foo() cold "hot-cold-split" {
|
|
ret void
|
|
}
|
|
|
|
declare void @sink() cold
|
|
|
|
; CHECK: define {{.*}} @fun.cold.1{{.*}}#[[outlined_func_attr]]
|
|
|
|
; CHECK: attributes #[[outlined_func_attr]] = {
|
|
; CHECK-SAME: cold
|
|
; CHECK-SAME: minsize
|