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Don't merge tiny functions.

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It's silly to merge functions like these:

define void @foo(i32 %x) {
  ret void
}

define void @bar(i32 %x) {
  ret void
}

to get

define void @bar(i32) {
  tail call void @foo(i32 %0)
  ret void
}

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191786 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2013-10-01 18:05:30 +00:00
parent 04132a6c5c
commit 187c774a76
3 changed files with 37 additions and 2 deletions
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12
lib/Transforms/IPO/MergeFunctions.cpp
View File

@ -836,6 +836,18 @@ bool MergeFunctions::insert(ComparableFunction &NewF) {
const ComparableFunction &OldF = *Result.first;
// Don't merge tiny functions, since it can just end up making the function
// larger.
// FIXME: Should still merge them if they are unnamed_addr and produce an
// alias.
if (NewF.getFunc()->size() == 1) {
if (NewF.getFunc()->front().size() <= 2) {
DEBUG(dbgs() << NewF.getFunc()->getName()
<< " is to small to bother merging\n");
return false;
}
}
// Never thunk a strong function to a weak function.
assert(!OldF.getFunc()->mayBeOverridden() ||
NewF.getFunc()->mayBeOverridden());

13
test/Transforms/MergeFunc/merge-ptr-and-int.ll
View File

@ -1,18 +1,27 @@
; RUN: opt -S -mergefunc < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
; CHECK-LABEL: f0
declare void @stuff()
; CHECK-LABEL: @f0(
define void @f0(i64 %p0) {
entry:
call void @stuff()
call void @stuff()
call void @stuff()
ret void
}
; CHECK-LABEL: f1
; CHECK-LABEL: @f1(
; CHECK: ptrtoint i64*
; CHECK: tail call void @f0(i64
define void @f1(i64* %p0) {
entry:
call void @stuff()
call void @stuff()
call void @stuff()
ret void
}

14
test/Transforms/MergeFunc/too-small.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: opt -S -mergefunc < %s | FileCheck %s
define void @foo(i32 %x) {
; CHECK-LABEL: @foo(
; CHECK-NOT: call
ret void
}
define void @bar(i32 %x) {
; CHECK-LABEL: @bar(
; CHECK-NOT: call
ret void
}