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Handle early inline for hot callsites that reside in the same basic block.

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Summary: Callsites in the same basic block should share the same hotness. This patch checks for the hottest callsite in the same basic block, and use the hotness for all callsites in that basic block for early inline decisions. It also fixes the test to add "-S" so theat the "CHECK-NOT" is actually checking the content.

Reviewers: dnovillo

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D24734

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281927 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dehao Chen 2016-09-19 18:38:14 +00:00
parent d809745696
commit ddeacc711a
3 changed files with 9 additions and 4 deletions
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9
lib/Transforms/IPO/SampleProfile.cpp
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@ -638,15 +638,20 @@ bool SampleProfileLoader::inlineHotFunctions(Function &F) {
bool LocalChanged = false;
SmallVector<Instruction *, 10> CIS;
for (auto &BB : F) {
bool Hot = false;
SmallVector<Instruction *, 10> Candidates;
for (auto &I : BB.getInstList()) {
const FunctionSamples *FS = nullptr;
if ((isa<CallInst>(I) || isa<InvokeInst>(I)) &&
(FS = findCalleeFunctionSamples(I))) {
Candidates.push_back(&I);
if (callsiteIsHot(Samples, FS))
CIS.push_back(&I);
Hot = true;
}
}
if (Hot) {
CIS.insert(CIS.begin(), Candidates.begin(), Candidates.end());
}
}
for (auto I : CIS) {
InlineFunctionInfo IFI(nullptr, ACT ? &GetAssumptionCache : nullptr);

2
test/Transforms/SampleProfile/Inputs/einline.prof
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@ -1,3 +1,3 @@
_Z3foov:200:100
1: _Z3barv:100
1: _Z3barv:0
3: _Z3barv:100

2
test/Transforms/SampleProfile/early-inline.ll
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@ -1,4 +1,4 @@
; RUN: opt < %s -instcombine -sample-profile -sample-profile-file=%S/Inputs/einline.prof | FileCheck %s
; RUN: opt < %s -instcombine -sample-profile -sample-profile-file=%S/Inputs/einline.prof -S | FileCheck %s
; Checks if both call and invoke can be inlined early if their inlined
; instances are hot in profile.