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Add an optimization to GlobalOpt that eliminates calls to __cxa_atexit, if the function passed is empty.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127970 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anders Carlsson
2011-03-20 17:59:11 +00:00
parent ed8f9589a8
commit a201c4c2e6
2 changed files with 132 additions and 0 deletions
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31
test/Transforms/GlobalOpt/cxx-dtor.ll Normal file
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@@ -0,0 +1,31 @@
; RUN: opt < %s -globalopt -S | FileCheck %s
%0 = type { i32, void ()* }
%struct.A = type { i8 }
@a = global %struct.A zeroinitializer, align 1
@__dso_handle = external global i8*
@llvm.global_ctors = appending global [1 x %0] [%0 { i32 65535, void ()* @_GLOBAL__I_a }]
; CHECK-NOT: call i32 @__cxa_atexit
define internal void @__cxx_global_var_init() nounwind section "__TEXT,__StaticInit,regular,pure_instructions" {
%1 = call i32 @__cxa_atexit(void (i8*)* bitcast (void (%struct.A*)* @_ZN1AD1Ev to void (i8*)*), i8* getelementptr inbounds (%struct.A* @a, i32 0, i32 0), i8* bitcast (i8** @__dso_handle to i8*))
ret void
}
define linkonce_odr void @_ZN1AD1Ev(%struct.A* %this) nounwind align 2 {
call void @_ZN1AD2Ev(%struct.A* %this)
ret void
}
declare i32 @__cxa_atexit(void (i8*)*, i8*, i8*)
define linkonce_odr void @_ZN1AD2Ev(%struct.A* %this) nounwind align 2 {
ret void
}
define internal void @_GLOBAL__I_a() nounwind section "__TEXT,__StaticInit,regular,pure_instructions" {
call void @__cxx_global_var_init()
ret void
}