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Summary: Make sure that any new and optimized objects created during GlobalOPT copy all the attributes from the base object. A good example of improper behavior in the current implementation is section information associated with the GlobalObject. If a section was set for it, and GlobalOpt is creating/modifying a new object based on this one (often copying the original name), without this change new object will be placed in a default section, resulting in inappropriate properties of the new variable. The argument here is that if customer specified a section for a variable, any changes to it that compiler does should not cause it to change that section allocation. Moreover, any other properties worth representation in copyAttributesFrom() should also be propagated. Reviewers: jmolloy, joker-eph, joker.eph Subscribers: slarin, joker.eph, rafael, tobiasvk, llvm-commits Differential Revision: http://reviews.llvm.org/D16074 llvm-svn: 258556
31 lines
1.1 KiB
LLVM
31 lines
1.1 KiB
LLVM
; This test lets globalopt split the global struct and array into different
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; values. The pass needs to preserve section attribute.
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; RUN: opt < %s -globalopt -S | FileCheck %s
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; Check that the new global values still have their section assignment.
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; CHECK: @struct
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; CHECK: section ".foo"
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; CHECK: @array
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; CHECK-NOT: section ".foo"
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@struct = internal global { i32, i32 } zeroinitializer, section ".foo"
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@array = internal global [ 2 x i32 ] zeroinitializer
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define i32 @foo() {
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%A = load i32, i32* getelementptr ({ i32, i32 }, { i32, i32 }* @struct, i32 0, i32 0)
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%B = load i32, i32* getelementptr ([ 2 x i32 ], [ 2 x i32 ]* @array, i32 0, i32 0)
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; Use the loaded values, so they won't get removed completely
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%R = add i32 %A, %B
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ret i32 %R
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}
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; We put stores in a different function, so that the global variables won't get
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; optimized away completely.
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define void @bar(i32 %R) {
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store i32 %R, i32* getelementptr ([ 2 x i32 ], [ 2 x i32 ]* @array, i32 0, i32 0)
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store i32 %R, i32* getelementptr ({ i32, i32 }, { i32, i32 }* @struct, i32 0, i32 0)
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ret void
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}
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