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Runtime flag to control branch funnel threshold
Reviewers: pcc Subscribers: hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D45193 llvm-svn: 329459
This commit is contained in:
Vitaly Buka
parent
8c35013df2
commit
51d42e420e
@ -111,6 +111,11 @@ static cl::opt<std::string> ClWriteSummary(
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cl::desc("Write summary to given YAML file after running pass"),
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cl::Hidden);
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static cl::opt<int> ClThreshold("wholeprogramdevirt-branch-funnel-threshold",
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cl::Hidden, cl::init(10), cl::ZeroOrMore,
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cl::desc("Maximum number of call targets per "
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"call site to enable branch funnels"));
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// Find the minimum offset that we may store a value of size Size bits at. If
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// IsAfter is set, look for an offset before the object, otherwise look for an
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// offset after the object.
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@ -820,8 +825,7 @@ void DevirtModule::tryICallBranchFunnel(
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if (T.getArch() != Triple::x86_64)
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return;
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const unsigned kBranchFunnelThreshold = 10;
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if (TargetsForSlot.size() > kBranchFunnelThreshold)
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if (TargetsForSlot.size() > ClThreshold)
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return;
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bool HasNonDevirt = !SlotInfo.CSInfo.AllCallSitesDevirted;
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100
test/Transforms/WholeProgramDevirt/branch-funnel-threshold.ll
Normal file
100
test/Transforms/WholeProgramDevirt/branch-funnel-threshold.ll
Normal file
@ -0,0 +1,100 @@
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; RUN: opt -wholeprogramdevirt -wholeprogramdevirt-summary-action=export -wholeprogramdevirt-read-summary=%S/Inputs/export.yaml -wholeprogramdevirt-write-summary=%t -wholeprogramdevirt-branch-funnel-threshold=1 -S -o - %s | not grep @llvm.icall.branch.funnel | count 0
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; RUN: opt -wholeprogramdevirt -wholeprogramdevirt-summary-action=export -wholeprogramdevirt-read-summary=%S/Inputs/export.yaml -wholeprogramdevirt-write-summary=%t -wholeprogramdevirt-branch-funnel-threshold=10 -S -o - %s | grep @llvm.icall.branch.funnel | count 4
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; RUN: opt -wholeprogramdevirt -wholeprogramdevirt-summary-action=export -wholeprogramdevirt-read-summary=%S/Inputs/export.yaml -wholeprogramdevirt-write-summary=%t -wholeprogramdevirt-branch-funnel-threshold=100 -S -o - %s | grep @llvm.icall.branch.funnel | count 5
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target datalayout = "e-p:64:64"
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target triple = "x86_64-unknown-linux-gnu"
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@vt1_1 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf1_1 to i8*)], !type !0
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@vt1_2 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf1_2 to i8*)], !type !0
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declare i32 @vf1_1(i8* %this, i32 %arg)
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declare i32 @vf1_2(i8* %this, i32 %arg)
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@vt2_1 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_1 to i8*)], !type !1
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@vt2_2 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_2 to i8*)], !type !1
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@vt2_3 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_3 to i8*)], !type !1
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@vt2_4 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_4 to i8*)], !type !1
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@vt2_5 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_5 to i8*)], !type !1
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@vt2_6 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_6 to i8*)], !type !1
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@vt2_7 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_7 to i8*)], !type !1
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@vt2_8 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_8 to i8*)], !type !1
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@vt2_9 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_9 to i8*)], !type !1
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@vt2_10 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_10 to i8*)], !type !1
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@vt2_11 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2_11 to i8*)], !type !1
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declare i32 @vf2_1(i8* %this, i32 %arg)
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declare i32 @vf2_2(i8* %this, i32 %arg)
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declare i32 @vf2_3(i8* %this, i32 %arg)
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declare i32 @vf2_4(i8* %this, i32 %arg)
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declare i32 @vf2_5(i8* %this, i32 %arg)
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declare i32 @vf2_6(i8* %this, i32 %arg)
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declare i32 @vf2_7(i8* %this, i32 %arg)
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declare i32 @vf2_8(i8* %this, i32 %arg)
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declare i32 @vf2_9(i8* %this, i32 %arg)
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declare i32 @vf2_10(i8* %this, i32 %arg)
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declare i32 @vf2_11(i8* %this, i32 %arg)
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@vt3_1 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf3_1 to i8*)], !type !2
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@vt3_2 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf3_2 to i8*)], !type !2
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declare i32 @vf3_1(i8* %this, i32 %arg)
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declare i32 @vf3_2(i8* %this, i32 %arg)
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@vt4_1 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf4_1 to i8*)], !type !3
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@vt4_2 = constant [1 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf4_2 to i8*)], !type !3
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declare i32 @vf4_1(i8* %this, i32 %arg)
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declare i32 @vf4_2(i8* %this, i32 %arg)
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define i32 @fn1(i8* %obj) #0 {
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%vtableptr = bitcast i8* %obj to [1 x i8*]**
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%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
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%vtablei8 = bitcast [1 x i8*]* %vtable to i8*
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%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid1")
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call void @llvm.assume(i1 %p)
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%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
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%fptr = load i8*, i8** %fptrptr
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%fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)*
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%result = call i32 %fptr_casted(i8* %obj, i32 1)
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ret i32 %result
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}
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define i32 @fn2(i8* %obj) #0 {
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%vtableptr = bitcast i8* %obj to [1 x i8*]**
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%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
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%vtablei8 = bitcast [1 x i8*]* %vtable to i8*
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%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid2")
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call void @llvm.assume(i1 %p)
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%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
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%fptr = load i8*, i8** %fptrptr
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%fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)*
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%result = call i32 %fptr_casted(i8* %obj, i32 1)
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ret i32 %result
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}
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define i32 @fn3(i8* %obj) #0 {
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%vtableptr = bitcast i8* %obj to [1 x i8*]**
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%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
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%vtablei8 = bitcast [1 x i8*]* %vtable to i8*
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%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !4)
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call void @llvm.assume(i1 %p)
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%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
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%fptr = load i8*, i8** %fptrptr
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%fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)*
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%result = call i32 %fptr_casted(i8* %obj, i32 1)
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ret i32 %result
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}
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declare i1 @llvm.type.test(i8*, metadata)
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declare void @llvm.assume(i1)
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!0 = !{i32 0, !"typeid1"}
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!1 = !{i32 0, !"typeid2"}
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!2 = !{i32 0, !"typeid3"}
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!3 = !{i32 0, !4}
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!4 = distinct !{}
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attributes #0 = { "target-features"="+retpoline" }
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