35c7e457e8
It isn't correct to always remove memprof metadata MIBs from the
original allocation call after inlining.
Let's say we have the following partial call graph:
C D
\ /
v v
B E
| /
v v
A
where A contains an allocation call. If both contexts including B have
the same allocation behavior, the context in the memprof metadata on the
allocation will be pruned, and we will have 2 MIBs with contexts:
A,B and A,E.
Previously, if we inlined A into B we propagate the matching MIBs onto
the inlined allocation call in B' (A,B in this case), and remove it from
the original out of line allocation in A. This is correct if we have a
single round of bottom up inlining.
However, in the compiler we can have multiple invocations of the inliner
pass (e.g. LTO). We may also inline non-bottom up with an alternative
inliner such as the ModuleInliner. In that case, we could end up first
inlining B into C, without having inlined A into B. The call graph then
looks like:
D
|
v
C' B E
\ | /
v v v
A
If we subsequently (perhaps on a later invocation of bottom up inlining)
inline A into B, the previous handling would propagate the memprof MIB
context A,B up into the inlined allocation in B', and remove it from the
original allocation in A. The propagation into B' is fine, however, by
removing it from A's allocation, we no longer reflect the context coming
from C'.
To fix this, simply prevent the removal of MIB from the original
allocation callsites.
Note that the memprof_inline.ll test has some changes to existing
checking to replace "noncold" with "notcold" in the metadata. The
corresponding CHECK was accidentally commented out in the old version
and thus this mistake was not previously detected.
Differential Revision: https://reviews.llvm.org/D140764
316 lines
15 KiB
LLVM
316 lines
15 KiB
LLVM
;; Test for memprof metadata propagation, ensuring metadata is moved to
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;; inlined callsites.
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;; Also check that callsite metadata was updated with inlined stack ids.
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;;
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;; The following code was used to generate the following IR and its memprof
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;; profile:
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;;
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;; #include <stdlib.h>
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;; #include <string.h>
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;; #include <unistd.h>
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;; char *foo() {
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;; return new char[10];
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;; }
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;; char *foo2() __attribute((noinline)) {
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;; return foo();
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;; }
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;; char *bar() {
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;; return foo2();
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;; }
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;; char *baz() {
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;; return foo2();
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;; }
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;; int main(int argc, char **argv) {
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;; char *c = foo();
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;; char *d = foo();
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;; char *e = bar();
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;; char *f = baz();
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;; memset(c, 0, 10);
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;; memset(d, 0, 10);
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;; memset(e, 0, 10);
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;; memset(f, 0, 10);
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;; delete[] c;
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;; sleep(200);
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;; delete[] d;
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;; delete[] e;
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;; delete[] f;
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;; return 0;
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;; }
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; RUN: opt -passes=inline %s -S | FileCheck %s
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; ModuleID = 'memprof_inline2.cc'
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source_filename = "memprof_inline2.cc"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: mustprogress uwtable
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; CHECK-LABEL: define dso_local noundef ptr @_Z3foov
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define dso_local noundef ptr @_Z3foov() #0 !dbg !39 {
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entry:
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;; We should keep the original memprof metadata intact.
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; CHECK: call {{.*}} @_Znam{{.*}} !memprof ![[ORIGMEMPROF:[0-9]+]]
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%call = call noalias noundef nonnull ptr @_Znam(i64 noundef 10) #7, !dbg !42, !memprof !43, !callsite !52
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ret ptr %call, !dbg !53
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}
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; Function Attrs: nobuiltin allocsize(0)
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declare noundef nonnull ptr @_Znam(i64 noundef) #1
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;; Mark noinline so we don't inline into calls from bar and baz. We should end
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;; up with a memprof metadata on the call to foo below.
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; Function Attrs: mustprogress noinline uwtable
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; CHECK-LABEL: define dso_local noundef ptr @_Z4foo2v
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define dso_local noundef ptr @_Z4foo2v() #2 !dbg !54 {
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entry:
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;; We should have memprof metadata for the call stacks from bar and baz,
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;; and the callsite metadata should be the concatentation of the id from the
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;; inlined call to new and the original callsite.
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; CHECK: call {{.*}} @_Znam{{.*}} !memprof ![[NEWMEMPROF:[0-9]+]], !callsite ![[NEWCALLSITE:[0-9]+]]
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%call = call noundef ptr @_Z3foov(), !dbg !55, !callsite !56
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ret ptr %call, !dbg !57
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}
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; Function Attrs: mustprogress uwtable
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define dso_local noundef ptr @_Z3barv() #0 !dbg !58 {
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entry:
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%call = call noundef ptr @_Z4foo2v(), !dbg !59, !callsite !60
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ret ptr %call, !dbg !61
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}
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; Function Attrs: mustprogress uwtable
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define dso_local noundef ptr @_Z3bazv() #0 !dbg !62 {
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entry:
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%call = call noundef ptr @_Z4foo2v(), !dbg !63, !callsite !64
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ret ptr %call, !dbg !65
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}
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;; Make sure we don't propagate any memprof/callsite metadata
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; Function Attrs: mustprogress uwtable
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; CHECK-LABEL: define dso_local noundef ptr @notprofiled
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define dso_local noundef ptr @notprofiled() #0 !dbg !66 {
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entry:
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; CHECK: call {{.*}} @_Znam
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; CHECK-NOT: !memprof
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; CHECK-NOT: !callsite
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%call = call noundef ptr @_Z3foov(), !dbg !67
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; CHECK-NEXT: ret
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ret ptr %call, !dbg !68
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}
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; Function Attrs: mustprogress noinline norecurse optnone uwtable
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define dso_local noundef i32 @main(i32 noundef %argc, ptr noundef %argv) #3 !dbg !69 {
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entry:
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%retval = alloca i32, align 4
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%argc.addr = alloca i32, align 4
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%argv.addr = alloca ptr, align 8
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%c = alloca ptr, align 8
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%d = alloca ptr, align 8
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%e = alloca ptr, align 8
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%f = alloca ptr, align 8
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store i32 0, ptr %retval, align 4
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store i32 %argc, ptr %argc.addr, align 4
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store ptr %argv, ptr %argv.addr, align 8
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;; The below 4 callsites are all annotated as noinline
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%call = call noundef ptr @_Z3foov() #8, !dbg !70, !callsite !71
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store ptr %call, ptr %c, align 8, !dbg !72
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%call1 = call noundef ptr @_Z3foov() #8, !dbg !73, !callsite !74
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store ptr %call1, ptr %d, align 8, !dbg !75
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%call2 = call noundef ptr @_Z3barv() #8, !dbg !76, !callsite !77
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store ptr %call2, ptr %e, align 8, !dbg !78
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%call3 = call noundef ptr @_Z3bazv() #8, !dbg !79, !callsite !80
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store ptr %call3, ptr %f, align 8, !dbg !81
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%0 = load ptr, ptr %c, align 8, !dbg !82
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call void @llvm.memset.p0.i64(ptr align 1 %0, i8 0, i64 10, i1 false), !dbg !83
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%1 = load ptr, ptr %d, align 8, !dbg !84
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call void @llvm.memset.p0.i64(ptr align 1 %1, i8 0, i64 10, i1 false), !dbg !85
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%2 = load ptr, ptr %e, align 8, !dbg !86
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call void @llvm.memset.p0.i64(ptr align 1 %2, i8 0, i64 10, i1 false), !dbg !87
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%3 = load ptr, ptr %f, align 8, !dbg !88
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call void @llvm.memset.p0.i64(ptr align 1 %3, i8 0, i64 10, i1 false), !dbg !89
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%4 = load ptr, ptr %c, align 8, !dbg !90
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%isnull = icmp eq ptr %4, null, !dbg !91
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br i1 %isnull, label %delete.end, label %delete.notnull, !dbg !91
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delete.notnull: ; preds = %entry
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call void @_ZdaPv(ptr noundef %4) #9, !dbg !92
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br label %delete.end, !dbg !92
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delete.end: ; preds = %delete.notnull, %entry
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%call4 = call i32 @sleep(i32 noundef 200), !dbg !94
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%5 = load ptr, ptr %d, align 8, !dbg !95
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%isnull5 = icmp eq ptr %5, null, !dbg !96
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br i1 %isnull5, label %delete.end7, label %delete.notnull6, !dbg !96
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delete.notnull6: ; preds = %delete.end
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call void @_ZdaPv(ptr noundef %5) #9, !dbg !97
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br label %delete.end7, !dbg !97
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delete.end7: ; preds = %delete.notnull6, %delete.end
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%6 = load ptr, ptr %e, align 8, !dbg !98
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%isnull8 = icmp eq ptr %6, null, !dbg !99
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br i1 %isnull8, label %delete.end10, label %delete.notnull9, !dbg !99
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delete.notnull9: ; preds = %delete.end7
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call void @_ZdaPv(ptr noundef %6) #9, !dbg !100
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br label %delete.end10, !dbg !100
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delete.end10: ; preds = %delete.notnull9, %delete.end7
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%7 = load ptr, ptr %f, align 8, !dbg !101
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%isnull11 = icmp eq ptr %7, null, !dbg !102
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br i1 %isnull11, label %delete.end13, label %delete.notnull12, !dbg !102
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delete.notnull12: ; preds = %delete.end10
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call void @_ZdaPv(ptr noundef %7) #9, !dbg !103
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br label %delete.end13, !dbg !103
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delete.end13: ; preds = %delete.notnull12, %delete.end10
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ret i32 0, !dbg !104
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}
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; Function Attrs: argmemonly nofree nounwind willreturn writeonly
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declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #4
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; Function Attrs: nobuiltin nounwind
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declare void @_ZdaPv(ptr noundef) #5
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declare i32 @sleep(i32 noundef) #6
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attributes #0 = { mustprogress uwtable "disable-tail-calls"="true" "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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attributes #1 = { nobuiltin allocsize(0) "disable-tail-calls"="true" "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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attributes #2 = { mustprogress noinline uwtable "disable-tail-calls"="true" "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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attributes #3 = { mustprogress noinline norecurse optnone uwtable "disable-tail-calls"="true" "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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attributes #4 = { argmemonly nofree nounwind willreturn writeonly }
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attributes #5 = { nobuiltin nounwind "disable-tail-calls"="true" "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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attributes #6 = { "disable-tail-calls"="true" "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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attributes #7 = { builtin allocsize(0) }
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attributes #8 = { noinline }
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attributes #9 = { builtin nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !8, !9}
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!llvm.ident = !{!38}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 15.0.0 (https://github.com/llvm/llvm-project.git e09c924f98ec157adeaa74819b0aec9a07a1b552)", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, splitDebugInlining: false, debugInfoForProfiling: true, nameTableKind: None)
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!1 = !DIFile(filename: "memprof_inline.cc", directory: "/usr/local/google/home/tejohnson/llvm/tmp", checksumkind: CSK_MD5, checksum: "8711f6fd269e6cb5611fef48bc906eab")
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!2 = !{i32 7, !"Dwarf Version", i32 5}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"wchar_size", i32 4}
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!5 = !{i32 7, !"PIC Level", i32 2}
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!6 = !{i32 7, !"PIE Level", i32 2}
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!7 = !{i32 7, !"uwtable", i32 2}
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!8 = !{i32 7, !"frame-pointer", i32 2}
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!9 = !{i32 1, !"ProfileSummary", !10}
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!10 = !{!11, !12, !13, !14, !15, !16, !17, !18, !19, !20}
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!11 = !{!"ProfileFormat", !"InstrProf"}
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!12 = !{!"TotalCount", i64 0}
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!13 = !{!"MaxCount", i64 0}
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!14 = !{!"MaxInternalCount", i64 0}
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!15 = !{!"MaxFunctionCount", i64 0}
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!16 = !{!"NumCounts", i64 0}
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!17 = !{!"NumFunctions", i64 0}
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!18 = !{!"IsPartialProfile", i64 0}
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!19 = !{!"PartialProfileRatio", double 0.000000e+00}
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!20 = !{!"DetailedSummary", !21}
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!21 = !{!22, !23, !24, !25, !26, !27, !28, !29, !30, !31, !32, !33, !34, !35, !36, !37}
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!22 = !{i32 10000, i64 0, i32 0}
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!23 = !{i32 100000, i64 0, i32 0}
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!24 = !{i32 200000, i64 0, i32 0}
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!25 = !{i32 300000, i64 0, i32 0}
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!26 = !{i32 400000, i64 0, i32 0}
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!27 = !{i32 500000, i64 0, i32 0}
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!28 = !{i32 600000, i64 0, i32 0}
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!29 = !{i32 700000, i64 0, i32 0}
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!30 = !{i32 800000, i64 0, i32 0}
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!31 = !{i32 900000, i64 0, i32 0}
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!32 = !{i32 950000, i64 0, i32 0}
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!33 = !{i32 990000, i64 0, i32 0}
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!34 = !{i32 999000, i64 0, i32 0}
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!35 = !{i32 999900, i64 0, i32 0}
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!36 = !{i32 999990, i64 0, i32 0}
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!37 = !{i32 999999, i64 0, i32 0}
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!38 = !{!"clang version 15.0.0 (https://github.com/llvm/llvm-project.git e09c924f98ec157adeaa74819b0aec9a07a1b552)"}
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!39 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !1, file: !1, line: 4, type: !40, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !41)
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!40 = !DISubroutineType(types: !41)
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!41 = !{}
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!42 = !DILocation(line: 5, column: 10, scope: !39)
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;; The first 2 are from the direct calls to foo from main. Those stay on the
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;; callsite in foo, which isn't inlined into main due to the callsites in main
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;; being annotated as noinline.
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;; The second 2 are from the calls from foo2, which inlines its callsite to foo
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;; but is not itself inlined into its callers. Therefore they get moved to a
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;; new memprof metadata within foo2.
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!43 = !{!44, !46, !48, !50}
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!44 = !{!45, !"cold"}
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!45 = !{i64 -2458008693472584243, i64 7394638144382192936}
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!46 = !{!47, !"notcold"}
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!47 = !{i64 -2458008693472584243, i64 -8908997186479157179}
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!48 = !{!49, !"notcold"}
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!49 = !{i64 -2458008693472584243, i64 -8079659623765193173, i64 -4805294506621015872}
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!50 = !{!51, !"cold"}
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!51 = !{i64 -2458008693472584243, i64 -8079659623765193173, i64 -972865200055133905}
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; CHECK: ![[ORIGMEMPROF]] = !{![[ORIGMIB1:[0-9]+]], ![[ORIGMIB2:[0-9]+]], ![[ORIGMIB3:[0-9]+]], ![[ORIGMIB4:[0-9]+]]}
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; CHECK: ![[ORIGMIB1]] = !{![[ORIGMIBSTACK1:[0-9]+]], !"cold"}
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; CHECK: ![[ORIGMIBSTACK1]] = !{i64 -2458008693472584243, i64 7394638144382192936}
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; CHECK: ![[ORIGMIB2]] = !{![[ORIGMIBSTACK2:[0-9]+]], !"notcold"}
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; CHECK: ![[ORIGMIBSTACK2]] = !{i64 -2458008693472584243, i64 -8908997186479157179}
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; CHECK: ![[ORIGMIB3]] = !{![[ORIGMIBSTACK3:[0-9]+]], !"notcold"}
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; CHECK: ![[ORIGMIBSTACK3]] = !{i64 -2458008693472584243, i64 -8079659623765193173, i64 -4805294506621015872}
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; CHECK: ![[ORIGMIB4]] = !{![[ORIGMIBSTACK4:[0-9]+]], !"cold"}
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; CHECK: ![[ORIGMIBSTACK4]] = !{i64 -2458008693472584243, i64 -8079659623765193173, i64 -972865200055133905}
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; CHECK: ![[NEWMEMPROF]] = !{![[ORIGMIB3:[0-9]+]], ![[ORIGMIB4:[0-9]+]]}
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; CHECK: ![[NEWCALLSITE]] = !{i64 -2458008693472584243, i64 -8079659623765193173}
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!52 = !{i64 -2458008693472584243}
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!53 = !DILocation(line: 5, column: 3, scope: !39)
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!54 = distinct !DISubprogram(name: "foo2", linkageName: "_Z4foo2v", scope: !1, file: !1, line: 7, type: !40, scopeLine: 7, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !41)
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!55 = !DILocation(line: 8, column: 10, scope: !54)
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!56 = !{i64 -8079659623765193173}
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!57 = !DILocation(line: 8, column: 3, scope: !54)
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!58 = distinct !DISubprogram(name: "bar", linkageName: "_Z3barv", scope: !1, file: !1, line: 10, type: !40, scopeLine: 10, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !41)
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!59 = !DILocation(line: 11, column: 10, scope: !58)
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!60 = !{i64 -972865200055133905}
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!61 = !DILocation(line: 11, column: 3, scope: !58)
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!62 = distinct !DISubprogram(name: "baz", linkageName: "_Z3bazv", scope: !1, file: !1, line: 13, type: !40, scopeLine: 13, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !41)
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!63 = !DILocation(line: 14, column: 10, scope: !62)
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!64 = !{i64 -4805294506621015872}
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!65 = !DILocation(line: 14, column: 3, scope: !62)
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!66 = distinct !DISubprogram(name: "notprofiled", linkageName: "notprofiled", scope: !1, file: !1, line: 400, type: !40, scopeLine: 400, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !41)
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!67 = !DILocation(line: 401, column: 10, scope: !66)
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!68 = !DILocation(line: 401, column: 3, scope: !66)
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!69 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 16, type: !40, scopeLine: 16, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !41)
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!70 = !DILocation(line: 17, column: 13, scope: !69)
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!71 = !{i64 -8908997186479157179}
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!72 = !DILocation(line: 17, column: 9, scope: !69)
|
|
!73 = !DILocation(line: 18, column: 13, scope: !69)
|
|
!74 = !{i64 7394638144382192936}
|
|
!75 = !DILocation(line: 18, column: 9, scope: !69)
|
|
!76 = !DILocation(line: 19, column: 13, scope: !69)
|
|
!77 = !{i64 -5510257407004945023}
|
|
!78 = !DILocation(line: 19, column: 9, scope: !69)
|
|
!79 = !DILocation(line: 20, column: 13, scope: !69)
|
|
!80 = !{i64 8771588133652501463}
|
|
!81 = !DILocation(line: 20, column: 9, scope: !69)
|
|
!82 = !DILocation(line: 21, column: 10, scope: !69)
|
|
!83 = !DILocation(line: 21, column: 3, scope: !69)
|
|
!84 = !DILocation(line: 22, column: 10, scope: !69)
|
|
!85 = !DILocation(line: 22, column: 3, scope: !69)
|
|
!86 = !DILocation(line: 23, column: 10, scope: !69)
|
|
!87 = !DILocation(line: 23, column: 3, scope: !69)
|
|
!88 = !DILocation(line: 24, column: 10, scope: !69)
|
|
!89 = !DILocation(line: 24, column: 3, scope: !69)
|
|
!90 = !DILocation(line: 25, column: 12, scope: !69)
|
|
!91 = !DILocation(line: 25, column: 3, scope: !69)
|
|
!92 = !DILocation(line: 25, column: 3, scope: !93)
|
|
!93 = !DILexicalBlockFile(scope: !69, file: !1, discriminator: 2)
|
|
!94 = !DILocation(line: 26, column: 3, scope: !69)
|
|
!95 = !DILocation(line: 27, column: 12, scope: !69)
|
|
!96 = !DILocation(line: 27, column: 3, scope: !69)
|
|
!97 = !DILocation(line: 27, column: 3, scope: !93)
|
|
!98 = !DILocation(line: 28, column: 12, scope: !69)
|
|
!99 = !DILocation(line: 28, column: 3, scope: !69)
|
|
!100 = !DILocation(line: 28, column: 3, scope: !93)
|
|
!101 = !DILocation(line: 29, column: 12, scope: !69)
|
|
!102 = !DILocation(line: 29, column: 3, scope: !69)
|
|
!103 = !DILocation(line: 29, column: 3, scope: !93)
|
|
!104 = !DILocation(line: 30, column: 3, scope: !69)
|