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Don't merge two constants if we care about the address of both.

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This fixes the original testcase in PR8927. It also causes a clang
binary built with a patched clang to increase in size by 0.21%.

We can probably get some of the size back by writing a pass that
detects that a global never has its pointer compared and adds
unnamed_addr to it (maybe extend global opt). It is also possible that
there are some other cases clang could add unnamed_addr to.

I will investigate extending globalopt next.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123584 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2011-01-16 17:05:09 +00:00
parent 1ed26acc58
commit d6e5cbc842
4 changed files with 105 additions and 23 deletions
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40
test/Transforms/ConstantMerge/unnamed-addr.ll Normal file
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@@ -0,0 +1,40 @@
; RUN: opt -constmerge %s -S -o - | FileCheck %s
; Test which corresponding x and y are merged and that unnamed_addr
; is correctly set.
declare void @zed(%struct.foobar*, %struct.foobar*)
%struct.foobar = type { i32 }
@test1.x = internal constant %struct.foobar { i32 1 }
@test1.y = constant %struct.foobar { i32 1 }
@test2.x = internal constant %struct.foobar { i32 2 }
@test2.y = unnamed_addr constant %struct.foobar { i32 2 }
@test3.x = internal unnamed_addr constant %struct.foobar { i32 3 }
@test3.y = constant %struct.foobar { i32 3 }
@test4.x = internal unnamed_addr constant %struct.foobar { i32 4 }
@test4.y = unnamed_addr constant %struct.foobar { i32 4 }
; CHECK: %struct.foobar = type { i32 }
; CHECK-NOT: @
; CHECK: @test1.x = internal constant %struct.foobar { i32 1 }
; CHECK-NEXT: @test1.y = constant %struct.foobar { i32 1 }
; CHECK-NEXT: @test2.y = constant %struct.foobar { i32 2 }
; CHECK-NEXT: @test3.y = constant %struct.foobar { i32 3 }
; CHECK-NEXT: @test4.y = unnamed_addr constant %struct.foobar { i32 4 }
; CHECK-NOT: @
; CHECK: declare void @zed(%struct.foobar*, %struct.foobar*)
define i32 @main() {
entry:
call void @zed(%struct.foobar* @test1.x, %struct.foobar* @test1.y)
call void @zed(%struct.foobar* @test2.x, %struct.foobar* @test2.y)
call void @zed(%struct.foobar* @test3.x, %struct.foobar* @test3.y)
call void @zed(%struct.foobar* @test4.x, %struct.foobar* @test4.y)
ret i32 0
}