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llvm-project/llvm/test/Transforms/HotColdSplit/update-split-loop-metadata.ll

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[CodeExtractor] Transfer debug info to extracted function After extracting, fix up debug info in both the old and new functions by 1) Pointing line locations and debug intrinsics to the new subprogram scope, and 2) Deleting intrinsics which point to values outside of the new function. Depends on https://reviews.llvm.org/D72795. Testing: check-llvm, check-clang, a build of LNT in the `-Os -g` config with "-mllvm -hot-cold-split=1" set, and end-to-end debugging of a toy program which undergoes splitting to verify that lldb can find variables, single step, etc. in extracted code. rdar://45507940 Differential Revision: https://reviews.llvm.org/D72801
2020-01-16 03:26:34 +08:00
; RUN: opt -hotcoldsplit -hotcoldsplit-threshold=0 -S < %s | FileCheck %s
; Check that llvm.loop metadata extracted by CodeExtractor is updated so that
; the debug locations it contains have the right scope.
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.14.0"
; CHECK-LABEL: define {{.*}}@basic.cold.1
; CHECK: br i1 {{.*}}, !llvm.loop [[LOOP_MD:![0-9]+]]
; The scope for these debug locations should be @basic.cold.1, not @basic.
; CHECK: [[SCOPE:![0-9]+]] = distinct !DISubprogram(name: "basic.cold.1"
; CHECK: [[LOOP_MD]] = distinct !{[[LOOP_MD]], [[LINE:![0-9]+]], [[LINE]]}
; CHECK: [[LINE]] = !DILocation(line: 1, column: 1, scope: [[SCOPE]])
Revert "[PM/CC1] Add -f[no-]split-cold-code CC1 option to toggle splitting" 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.
2020-10-19 18:23:22 +08:00
define void @basic(i32* %p, i32 %k) !dbg !6 {
[CodeExtractor] Transfer debug info to extracted function After extracting, fix up debug info in both the old and new functions by 1) Pointing line locations and debug intrinsics to the new subprogram scope, and 2) Deleting intrinsics which point to values outside of the new function. Depends on https://reviews.llvm.org/D72795. Testing: check-llvm, check-clang, a build of LNT in the `-Os -g` config with "-mllvm -hot-cold-split=1" set, and end-to-end debugging of a toy program which undergoes splitting to verify that lldb can find variables, single step, etc. in extracted code. rdar://45507940 Differential Revision: https://reviews.llvm.org/D72801
2020-01-16 03:26:34 +08:00
entry:
%cmp3 = icmp slt i32 0, %k
br i1 %cmp3, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.body
%i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
%incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1
store i32 %i.05, i32* %p.addr.04, align 4
%inc = add nsw i32 %i.05, 1
call void @sink()
%cmp = icmp slt i32 %inc, %k
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !llvm.loop !10
for.cond.for.end_crit_edge: ; preds = %for.body
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
ret void
}
declare void @sink() cold
!llvm.dbg.cu = !{!0}
!llvm.debugify = !{!3, !4}
!llvm.module.flags = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "<stdin>", directory: "/")
!2 = !{}
!3 = !{i32 22}
!4 = !{i32 12}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = distinct !DISubprogram(name: "basic", linkageName: "basic", scope: null, file: !1, line: 1, type: !7, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
!7 = !DISubroutineType(types: !2)
!8 = !{}
!9 = !DILocation(line: 1, column: 1, scope: !6)
!10 = distinct !{!10, !9, !9}