From a84aa64e93ae94d42f8025e9d6ab89a19da422dd Mon Sep 17 00:00:00 2001
From: Dehao Chen <dehao@google.com>
Date: Tue, 19 Sep 2017 18:26:54 +0000
Subject: [PATCH] Handle profile mismatch correctly for SamplePGO.

Summary: Fix the bug when promoted call return type mismatches with the promoted function, we should not try to inline it. Otherwise it may lead to compiler crash.

Reviewers: davidxl, tejohnson, eraman

Reviewed By: tejohnson

Subscribers: llvm-commits, sanjoy

Differential Revision: https://reviews.llvm.org/D38018

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313658 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/IPO/SampleProfile.cpp                 |  7 ++++++-
 .../SampleProfile/Inputs/indirect-call.prof          |  3 +++
 test/Transforms/SampleProfile/indirect-call.ll       | 20 ++++++++++++++++++++
 3 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/lib/Transforms/IPO/SampleProfile.cpp b/lib/Transforms/IPO/SampleProfile.cpp
index ac20d2a520d..039fed0360f 100644
--- a/lib/Transforms/IPO/SampleProfile.cpp
+++ b/lib/Transforms/IPO/SampleProfile.cpp
@@ -720,7 +720,7 @@ bool SampleProfileLoader::inlineHotFunctions(
         continue;
       Instruction *DI = I;
       if (!CalledFunction && !PromotedInsns.count(I) &&
-          CallSite(I).isIndirectCall())
+          CallSite(I).isIndirectCall()) {
         for (const auto *FS : findIndirectCallFunctionSamples(*I)) {
           auto CalleeFunctionName = FS->getName();
           // If it is a recursive call, we do not inline it as it could bloat
@@ -751,12 +751,17 @@ bool SampleProfileLoader::inlineHotFunctions(
             continue;
           }
         }
+        // If there is profile mismatch, we should not attempt to inline DI.
+        if (!isa<CallInst>(DI) && !isa<InvokeInst>(DI))
+          continue;
+      }
       if (!CalledFunction || !CalledFunction->getSubprogram()) {
         findCalleeFunctionSamples(*I)->findImportedFunctions(
             ImportGUIDs, F.getParent(),
             Samples->getTotalSamples() * SampleProfileHotThreshold / 100);
         continue;
       }
+      assert(isa<CallInst>(DI) || isa<InvokeInst>(DI));
       CallSite CS(DI);
       DebugLoc DLoc = I->getDebugLoc();
       BasicBlock *BB = I->getParent();
diff --git a/test/Transforms/SampleProfile/Inputs/indirect-call.prof b/test/Transforms/SampleProfile/Inputs/indirect-call.prof
index ff1368142a0..f35b4b13c71 100644
--- a/test/Transforms/SampleProfile/Inputs/indirect-call.prof
+++ b/test/Transforms/SampleProfile/Inputs/indirect-call.prof
@@ -20,3 +20,6 @@ test_inline_strip_conflict:3000:0
 test_norecursive_inline:3000:0
  1: test_norecursive_inline:3000
   20: 3000
+test_noinline_bitcast:3000:0
+ 1: foo_direct_i32:3000
+  1: 3000
diff --git a/test/Transforms/SampleProfile/indirect-call.ll b/test/Transforms/SampleProfile/indirect-call.ll
index bee98f1066d..28d61ed2426 100644
--- a/test/Transforms/SampleProfile/indirect-call.ll
+++ b/test/Transforms/SampleProfile/indirect-call.ll
@@ -69,6 +69,19 @@ define void @test_noinline(void ()*) !dbg !12 {
   ret void
 }
 
+; CHECK-LABEL: @test_noinline_bitcast
+; If the indirect call has been promoted to a direct call with bitcast,
+; do not inline it.
+define float @test_noinline_bitcast(float ()*) !dbg !26 {
+  %2 = alloca float ()*
+  store float ()* %0, float ()** %2
+; CHECK: icmp
+; CHECK: call
+  %3 = load float ()*, float ()** %2
+  %4 = call float %3(), !dbg !27
+  ret float %4
+}
+
 ; CHECK-LABEL: @test_norecursive_inline
 ; If the indirect call target is the caller, we should not promote it.
 define void @test_norecursive_inline() !dbg !24 {
@@ -114,6 +127,10 @@ define void @foo_direct() !dbg !21 {
   ret void
 }
 
+define i32 @foo_direct_i32() !dbg !28 {
+  ret i32 0;
+}
+
 ; CHECK-LABEL: @test_direct
 ; We should not promote a direct call.
 define void @test_direct() !dbg !22 {
@@ -155,3 +172,6 @@ define void @test_direct() !dbg !22 {
 !23 = !DILocation(line: 23, scope: !22)
 !24 = distinct !DISubprogram(name: "test_norecursive_inline", scope: !1, file: !1, line: 12, unit: !0)
 !25 = !DILocation(line: 13, scope: !24)
+!26 = distinct !DISubprogram(name: "test_noinline_bitcast", scope: !1, file: !1, line: 12, unit: !0)
+!27 = !DILocation(line: 13, scope: !26)
+!28 = distinct !DISubprogram(name: "foo_direct_i32", scope: !1, file: !1, line: 11, unit: !0)
-- 
2.11.0