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Inliner uses a smaller inline threshold for callees with cold attribute.

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Added command line option inlinecold-threshold to set threshold for inlining
functions with cold attribute. Listen to the cold attribute when it would
decrease the inline threshold.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren 2014-02-05 22:53:44 +00:00
parent 8147752976
commit df7da79db6
2 changed files with 99 additions and 0 deletions
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11
lib/Transforms/IPO/Inliner.cpp
View File

@ -50,6 +50,10 @@ static cl::opt<int>
HintThreshold("inlinehint-threshold", cl::Hidden, cl::init(325),
cl::desc("Threshold for inlining functions with inline hint"));
static cl::opt<int>
ColdThreshold("inlinecold-threshold", cl::Hidden, cl::init(75),
cl::desc("Threshold for inlining functions with cold attribute"));
// Threshold to use when optsize is specified (and there is no -inline-limit).
const int OptSizeThreshold = 75;
@ -277,6 +281,13 @@ unsigned Inliner::getInlineThreshold(CallSite CS) const {
Attribute::MinSize))
thres = HintThreshold;
// Listen to the cold attribute when it would decrease the threshold.
bool ColdCallee = Callee && !Callee->isDeclaration() &&
Callee->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
Attribute::Cold);
if (ColdCallee && ColdThreshold < thres)
thres = ColdThreshold;
return thres;
}

88
test/Transforms/Inline/inline-cold.ll Normal file
View File

@ -0,0 +1,88 @@
; RUN: opt < %s -inline -S | FileCheck %s
; Test that functions with attribute Cold are not inlined while the
; same function without attribute Cold will be inlined.
@a = global i32 4
; This function should be larger than the cold threshold (75), but smaller
; than the regular threshold.
; Function Attrs: nounwind readnone uwtable
define i32 @simpleFunction(i32 %a) #0 {
entry:
%a1 = load volatile i32* @a
%x1 = add i32 %a1, %a1
%a2 = load volatile i32* @a
%x2 = add i32 %x1, %a2
%a3 = load volatile i32* @a
%x3 = add i32 %x2, %a3
%a4 = load volatile i32* @a
%x4 = add i32 %x3, %a4
%a5 = load volatile i32* @a
%x5 = add i32 %x4, %a5
%a6 = load volatile i32* @a
%x6 = add i32 %x5, %a6
%a7 = load volatile i32* @a
%x7 = add i32 %x6, %a6
%a8 = load volatile i32* @a
%x8 = add i32 %x7, %a8
%a9 = load volatile i32* @a
%x9 = add i32 %x8, %a9
%a10 = load volatile i32* @a
%x10 = add i32 %x9, %a10
%a11 = load volatile i32* @a
%x11 = add i32 %x10, %a11
%a12 = load volatile i32* @a
%x12 = add i32 %x11, %a12
%add = add i32 %x12, %a
ret i32 %add
}
; Function Attrs: nounwind cold readnone uwtable
define i32 @ColdFunction(i32 %a) #1 {
; CHECK-LABEL: @ColdFunction
; CHECK: ret
entry:
%a1 = load volatile i32* @a
%x1 = add i32 %a1, %a1
%a2 = load volatile i32* @a
%x2 = add i32 %x1, %a2
%a3 = load volatile i32* @a
%x3 = add i32 %x2, %a3
%a4 = load volatile i32* @a
%x4 = add i32 %x3, %a4
%a5 = load volatile i32* @a
%x5 = add i32 %x4, %a5
%a6 = load volatile i32* @a
%x6 = add i32 %x5, %a6
%a7 = load volatile i32* @a
%x7 = add i32 %x6, %a6
%a8 = load volatile i32* @a
%x8 = add i32 %x7, %a8
%a9 = load volatile i32* @a
%x9 = add i32 %x8, %a9
%a10 = load volatile i32* @a
%x10 = add i32 %x9, %a10
%a11 = load volatile i32* @a
%x11 = add i32 %x10, %a11
%a12 = load volatile i32* @a
%x12 = add i32 %x11, %a12
%add = add i32 %x12, %a
ret i32 %add
}
; Function Attrs: nounwind readnone uwtable
define i32 @bar(i32 %a) #0 {
; CHECK-LABEL: @bar
; CHECK: call i32 @ColdFunction(i32 5)
; CHECK-NOT: call i32 @simpleFunction(i32 6)
; CHECK: ret
entry:
%0 = tail call i32 @ColdFunction(i32 5)
%1 = tail call i32 @simpleFunction(i32 6)
%add = add i32 %0, %1
ret i32 %add
}
attributes #0 = { nounwind readnone uwtable }
attributes #1 = { nounwind cold readnone uwtable }