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3152e057e1
Summary: This patch improves thinlto importer by importing 3x larger functions that are called from hot block. I compared performance with the trunk on spec, and there were about 2% on povray and 3.33% on milc. These results seems to be consistant and match the results Teresa got with her simple heuristic. Some benchmarks got slower but I think they are just noisy (mcf, xalancbmki, omnetpp)- running the benchmarks again with more iterations to confirm. Geomean of all benchmarks including the noisy ones were about +0.02%. I see much better improvement on google branch with Easwaran patch for pgo callsite inlining (the inliner actually inline those big functions) Over all I see +0.5% improvement, and I get +8.65% on povray. So I guess we will see much bigger change when Easwaran patch will land (it depends on new pass manager), but it is still worth putting this to trunk before it. Implementation details changes: - Removed CallsiteCount. - ProfileCount got replaced by Hotness - hot-import-multiplier is set to 3.0 for now, didn't have time to tune it up, but I see that we get most of the interesting functions with 3, so there is no much performance difference with higher, and binary size doesn't grow as much as with 10.0. Reviewers: eraman, mehdi_amini, tejohnson Subscribers: mehdi_amini, llvm-commits Differential Revision: https://reviews.llvm.org/D24638 llvm-svn: 282437
122 lines
5.0 KiB
LLVM
122 lines
5.0 KiB
LLVM
; Test to check both the callgraph and refgraph in summary
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; RUN: opt -module-summary %s -o %t.o
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; RUN: llvm-bcanalyzer -dump %t.o | FileCheck %s
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; See if the calls and other references are recorded properly using the
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; expected value id and other information as appropriate (callsite cout
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; for calls). Use different linkage types for the various test cases to
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; distinguish the test cases here (op1 contains the linkage type).
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; Note that op3 contains the # non-call references.
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; This also ensures that we didn't include a call or reference to intrinsic
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; llvm.ctpop.i8.
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; CHECK: <GLOBALVAL_SUMMARY_BLOCK
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; Function main contains call to func, as well as address reference to func:
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; CHECK-DAG: <PERMODULE {{.*}} op0=[[MAINID:[0-9]+]] op1=0 {{.*}} op3=1 op4=[[FUNCID:[0-9]+]] op5=[[FUNCID]]/>
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; Function W contains a call to func3 as well as a reference to globalvar:
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; CHECK-DAG: <PERMODULE {{.*}} op0=[[WID:[0-9]+]] op1=5 {{.*}} op3=1 op4=[[GLOBALVARID:[0-9]+]] op5=[[FUNC3ID:[0-9]+]]/>
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; Function X contains call to foo, as well as address reference to foo
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; which is in the same instruction as the call:
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; CHECK-DAG: <PERMODULE {{.*}} op0=[[XID:[0-9]+]] op1=1 {{.*}} op3=1 op4=[[FOOID:[0-9]+]] op5=[[FOOID]]/>
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; Function Y contains call to func2, and ensures we don't incorrectly add
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; a reference to it when reached while earlier analyzing the phi using its
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; return value:
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; CHECK-DAG: <PERMODULE {{.*}} op0=[[YID:[0-9]+]] op1=8 {{.*}} op3=0 op4=[[FUNC2ID:[0-9]+]]/>
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; Function Z contains call to func2, and ensures we don't incorrectly add
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; a reference to it when reached while analyzing subsequent use of its return
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; value:
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; CHECK-DAG: <PERMODULE {{.*}} op0=[[ZID:[0-9]+]] op1=3 {{.*}} op3=0 op4=[[FUNC2ID:[0-9]+]]/>
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; Variable bar initialization contains address reference to func:
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; CHECK-DAG: <PERMODULE_GLOBALVAR_INIT_REFS {{.*}} op0=[[BARID:[0-9]+]] op1=0 op2=[[FUNCID]]/>
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; CHECK: </GLOBALVAL_SUMMARY_BLOCK>
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; CHECK-NEXT: <VALUE_SYMTAB
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; CHECK-DAG: <ENTRY {{.*}} op0=[[BARID]] {{.*}} record string = 'bar'
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; CHECK-DAG: <ENTRY {{.*}} op0=[[FUNCID]] {{.*}} record string = 'func'
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; CHECK-DAG: <ENTRY {{.*}} op0=[[FOOID]] {{.*}} record string = 'foo'
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; CHECK-DAG: <FNENTRY {{.*}} op0=[[MAINID]] {{.*}} record string = 'main'
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; CHECK-DAG: <FNENTRY {{.*}} op0=[[WID]] {{.*}} record string = 'W'
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; CHECK-DAG: <FNENTRY {{.*}} op0=[[XID]] {{.*}} record string = 'X'
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; CHECK-DAG: <FNENTRY {{.*}} op0=[[YID]] {{.*}} record string = 'Y'
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; CHECK-DAG: <FNENTRY {{.*}} op0=[[ZID]] {{.*}} record string = 'Z'
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; CHECK-DAG: <ENTRY {{.*}} op0=[[FUNC2ID]] {{.*}} record string = 'func2'
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; CHECK-DAG: <ENTRY {{.*}} op0=[[FUNC3ID]] {{.*}} record string = 'func3'
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; CHECK-DAG: <ENTRY {{.*}} op0=[[GLOBALVARID]] {{.*}} record string = 'globalvar'
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; CHECK: </VALUE_SYMTAB>
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; ModuleID = 'thinlto-function-summary-refgraph.ll'
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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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@bar = global void (...)* bitcast (void ()* @func to void (...)*), align 8
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@globalvar = global i32 0, align 4
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declare void @func() #0
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declare i32 @func2(...) #1
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declare void @foo(i8* %F) #0
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declare i32 @func3(i32* dereferenceable(4)) #2
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; Function Attrs: nounwind uwtable
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define weak_odr void @W() #0 {
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entry:
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%call = tail call i32 @func3(i32* nonnull dereferenceable(4) @globalvar)
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ret void
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}
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; Function Attrs: nounwind uwtable
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define available_externally void @X() #0 {
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entry:
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call void @foo(i8* bitcast (void (i8*)* @foo to i8*))
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ret void
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}
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; Function Attrs: nounwind uwtable
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define private i32 @Y(i32 %i) #0 {
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entry:
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%cmp3 = icmp slt i32 %i, 10
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br i1 %cmp3, label %while.body.preheader, label %while.end
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while.body.preheader: ; preds = %entry
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br label %while.body
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while.body: ; preds = %while.body.preheader, %while.body
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%j.05 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]
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%i.addr.04 = phi i32 [ %inc, %while.body ], [ %i, %while.body.preheader ]
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%inc = add nsw i32 %i.addr.04, 1
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%call = tail call i32 (...) @func2() #2
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%add = add nsw i32 %call, %j.05
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %while.end.loopexit, label %while.body
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while.end.loopexit: ; preds = %while.body
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%add.lcssa = phi i32 [ %add, %while.body ]
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br label %while.end
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while.end: ; preds = %while.end.loopexit, %entry
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%j.0.lcssa = phi i32 [ 0, %entry ], [ %add.lcssa, %while.end.loopexit ]
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ret i32 %j.0.lcssa
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}
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; Function Attrs: nounwind uwtable
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define linkonce_odr i32 @Z() #0 {
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entry:
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%call = tail call i32 (...) @func2() #2
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ret i32 %call
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}
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declare i8 @llvm.ctpop.i8(i8)
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; Function Attrs: nounwind uwtable
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define i32 @main() #0 {
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entry:
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%retval = alloca i32, align 4
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%foo = alloca void (...)*, align 8
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store i32 0, i32* %retval, align 4
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store void (...)* bitcast (void ()* @func to void (...)*), void (...)** %foo, align 8
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%0 = load void (...)*, void (...)** %foo, align 8
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call void (...) %0()
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call void @func()
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call i8 @llvm.ctpop.i8( i8 10 )
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ret i32 0
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}
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