88fbc4d3df
This adds support for a HasTailCall flag on function call edges in the ThinLTO summary. It is intended for use in aiding discovery of missing frames from tail calls in profiled call stacks for MemProf of profiled binaries that did not disable tail call elimination. A follow on change will add the use of this new flag during MemProf context disambiguation. The new flag is encoded in the bitcode along with either the hotness flag from the profile, or the relative block frequency under the -write-relbf-to-summary flag when there is no profile data. Because we now will always have some additional call edge information, I have removed the non-profile function summary record format, and we simply encode the tail call flag along with a hotness type of none when there is no profile information or relative block frequency. The change of record format and name caused most of the test case changes. I have added explicit testing of generation of the new tail call flag into the bitcode and IR assembly format as part of the changes to llvm/test/Bitcode/thinlto-function-summary-refgraph.ll. I have also added round trip testing through assembly and bitcode to llvm/test/Assembler/thinlto-summary.ll.
82 lines
2.3 KiB
LLVM
82 lines
2.3 KiB
LLVM
; RUN: opt -passes=name-anon-globals -module-summary < %s | llvm-bcanalyzer -dump | FileCheck %s -check-prefix=BC
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; Check for summary block/records.
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; BC: <SOURCE_FILENAME
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; "h"
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; BC-NEXT: <GLOBALVAR {{.*}} op0=0 op1=1
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; "foo"
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; BC-NEXT: <FUNCTION op0=1 op1=3
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; "bar"
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; BC-NEXT: <FUNCTION op0=4 op1=3
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; "anon.[32 chars].0"
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; BC-NEXT: <FUNCTION op0=7 op1=39
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; "variadic"
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; BC-NEXT: <FUNCTION op0=46 op1=8
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; "llvm.va_start"
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; BC-NEXT: <FUNCTION op0=54 op1=13
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; "f"
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; BC-NEXT: <ALIAS op0=67 op1=1
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; BC: <GLOBALVAL_SUMMARY_BLOCK
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; BC-NEXT: <VERSION
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; BC-NEXT: <FLAGS
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; BC-NEXT: <PERMODULE_PROFILE {{.*}} op0=1 op1=0
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; BC-NEXT: <PERMODULE_PROFILE {{.*}} op0=2 op1=0
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; BC-NEXT: <PERMODULE_PROFILE {{.*}} op0=3 op1=7
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; BC-NEXT: <PERMODULE_PROFILE {{.*}} op0=4 op1=0 op2=4 op3=0
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; BC-NEXT: <ALIAS {{.*}} op0=6 op1=0 op2=3
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; BC-NEXT: </GLOBALVAL_SUMMARY_BLOCK
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; BC: <STRTAB_BLOCK
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; BC-NEXT: blob data = 'hfoobaranon.{{................................}}.0variadicllvm.va_startf{{.*}}'
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; RUN: opt -passes=name-anon-globals -module-summary < %s | llvm-dis | FileCheck %s
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; RUN: opt -passes=name-anon-globals -module-summary -S < %s | FileCheck %s
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; RUN: opt -passes=name-anon-globals -module-summary -S < %s | llvm-as | llvm-dis | FileCheck %s
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; Check that this round-trips correctly.
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; ModuleID = '<stdin>'
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK: define i32 @foo()
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; Function Attrs: nounwind uwtable
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define i32 @foo() #0 {
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entry:
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ret i32 1
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}
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; CHECK: define i32 @bar(i32 %x)
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; Function Attrs: nounwind uwtable
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define i32 @bar(i32 %x) #0 {
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entry:
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ret i32 %x
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}
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; FIXME: Anonymous function and alias not currently in summary until
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; follow on fixes to rename anonymous globals and emit alias summary
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; entries are committed.
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; Check an anonymous function as well, since in that case only the alias
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; ends up in the value symbol table and having a summary.
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@f = alias void (), void ()* @0 ; <ptr> [#uses=0]
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@h = external global void ()* ; <ptr> [#uses=0]
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define internal void @0() nounwind {
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entry:
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store void()* @0, void()** @h
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br label %return
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return: ; preds = %entry
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ret void
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}
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define i32 @variadic(...) {
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%ap = alloca i8*, align 8
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%ap.0 = bitcast i8** %ap to i8*
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call void @llvm.va_start(i8* %ap.0)
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ret i32 42
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}
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declare void @llvm.va_start(i8*) nounwind
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