Remove setting of inlinehint and cold attributes based on profile data

NFC. These hints are only used for inlining and the inliner now uses
the same criteria to identify hot and cold callees and set appropriate
thresholds without relying on these hints. Hence this removed code is
superfluous.

Differential Revision: http://reviews.llvm.org/D15726

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@256793 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/CodeGenPGO.cpp b/lib/CodeGen/CodeGenPGO.cpp
index 38774332f31d687bb8817fb7640997640cc0366e..5ae861eab0d31cb5849d657ba574aeb48ea4a6f5 100644 (file)
--- a/lib/CodeGen/CodeGenPGO.cpp
+++ b/lib/CodeGen/CodeGenPGO.cpp
@@ -721,17 +721,7 @@ CodeGenPGO::applyFunctionAttributes(llvm::IndexedInstrProfReader *PGOReader,
   if (!haveRegionCounts())
     return;
 
-  uint64_t MaxFunctionCount = PGOReader->getMaximumFunctionCount();
   uint64_t FunctionCount = getRegionCount(nullptr);
-  if (FunctionCount >= (uint64_t)(0.3 * (double)MaxFunctionCount))
-    // Turn on InlineHint attribute for hot functions.
-    // FIXME: 30% is from preliminary tuning on SPEC, it may not be optimal.
-    Fn->addFnAttr(llvm::Attribute::InlineHint);
-  else if (FunctionCount <= (uint64_t)(0.01 * (double)MaxFunctionCount))
-    // Turn on Cold attribute for cold functions.
-    // FIXME: 1% is from preliminary tuning on SPEC, it may not be optimal.
-    Fn->addFnAttr(llvm::Attribute::Cold);
-
   Fn->setEntryCount(FunctionCount);
 }
 

diff --git a/test/Profile/c-attributes.c b/test/Profile/c-attributes.c
deleted file mode 100644 (file)
index 2dcc180..0000000
--- a/test/Profile/c-attributes.c
+++ /dev/null
@@ -1,48 +0,0 @@
-// Test that instrumentation based profiling sets function attributes correctly.
-
-// RUN: llvm-profdata merge %S/Inputs/c-attributes.proftext -o %t.profdata
-// RUN: %clang %s -o - -mllvm -disable-llvm-optzns -emit-llvm -S -fprofile-instr-use=%t.profdata | FileCheck %s
-
-extern int atoi(const char *);
-
-// CHECK: hot_100_percent(i32{{.*}}%i) [[HOT:#[0-9]+]]
-void hot_100_percent(int i) {
-  while (i > 0)
-    i--;
-}
-
-// CHECK: hot_40_percent(i32{{.*}}%i) [[HOT]]
-void hot_40_percent(int i) {
-  while (i > 0)
-    i--;
-}
-
-// CHECK: normal_func(i32{{.*}}%i) [[NORMAL:#[0-9]+]]
-void normal_func(int i) {
-  while (i > 0)
-    i--;
-}
-
-// CHECK: cold_func(i32{{.*}}%i) [[COLD:#[0-9]+]]
-void cold_func(int i) {
-  while (i > 0)
-    i--;
-}
-
-// CHECK: attributes [[HOT]] = { inlinehint nounwind {{.*}} }
-// CHECK: attributes [[NORMAL]] = { nounwind {{.*}} }
-// CHECK: attributes [[COLD]] = { cold nounwind {{.*}} }
-
-int main(int argc, const char *argv[]) {
-  int max = atoi(argv[1]);
-  int i;
-  for (i = 0; i < max; i++)
-    hot_100_percent(i);
-  for (i = 0; i < max * 4 / 10; i++)
-    hot_40_percent(i);
-  for (i = 0; i < max * 2 / 10; i++)
-    normal_func(i);
-  for (i = 0; i < max / 200; i++)
-    cold_func(i);
-  return 0;
-}

diff --git a/test/Profile/func-entry.c b/test/Profile/func-entry.c
index 32c20a2a458edfa8014d402a2e466374f4da00bd..1ecae601a4d97d6b1bc4ead145766bddab5b6f2c 100644 (file)
--- a/test/Profile/func-entry.c
+++ b/test/Profile/func-entry.c
@@ -5,10 +5,10 @@
 
 void foo(void);
 
-// CHECK: @foo() #0 !prof [[FOO:![0-9]+]]
+// CHECK: @foo() #{{[0-9]}} !prof [[FOO:![0-9]+]]
 void foo() { return; }
 
-// CHECK: @main() #1 !prof [[MAIN:![0-9]+]]
+// CHECK: @main() #{{[0-9]}} !prof [[MAIN:![0-9]+]]
 int main() {
   int i;
   for (i = 0; i < 10000; i++) foo();