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InstCombine: don't drop 'inalloca' in PromoteCastOfAllocation (PR19569)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207426 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hans Wennborg 2014-04-28 17:40:03 +00:00
parent ac22ae75e3
commit 6426666f65
2 changed files with 22 additions and 0 deletions
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1
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -143,6 +143,7 @@ Instruction *InstCombiner::PromoteCastOfAllocation(BitCastInst &CI,
AllocaInst *New = AllocaBuilder.CreateAlloca(CastElTy, Amt);
New->setAlignment(AI.getAlignment());
New->takeName(&AI);
New->setUsedWithInAlloca(AI.isUsedWithInAlloca());
// If the allocation has multiple real uses, insert a cast and change all
// things that used it to use the new cast. This will also hack on CI, but it

21
test/Transforms/InstCombine/alloca.ll
View File

@ -129,3 +129,24 @@ define void @test8() {
call void (...)* @use(i32* %x)
ret void
}
; PR19569
%struct_type = type { i32, i32 }
declare void @test9_aux(<{ %struct_type }>* inalloca)
declare i8* @llvm.stacksave()
declare void @llvm.stackrestore(i8*)
define void @test9(%struct_type* %a) {
; CHECK-LABEL: @test9(
entry:
%inalloca.save = call i8* @llvm.stacksave()
%argmem = alloca inalloca <{ %struct_type }>
; CHECK: alloca inalloca i64, align 8
%0 = getelementptr inbounds <{ %struct_type }>* %argmem, i32 0, i32 0
%1 = bitcast %struct_type* %0 to i8*
%2 = bitcast %struct_type* %a to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* %2, i32 8, i32 4, i1 false)
call void @test9_aux(<{ %struct_type }>* inalloca %argmem)
call void @llvm.stackrestore(i8* %inalloca.save)
ret void
}