[llvm] r207426 - InstCombine: don't drop 'inalloca' in PromoteCastOfAllocation (PR19569)

[Hans Wennborg]

Author: hans
Date: Mon Apr 28 12:40:03 2014
New Revision: 207426

URL: http://llvm.org/viewvc/llvm-project?rev=207426&view=rev
Log:
InstCombine: don't drop 'inalloca' in PromoteCastOfAllocation (PR19569)

Modified:
    llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp
    llvm/trunk/test/Transforms/InstCombine/alloca.ll

Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp?rev=207426&r1=207425&r2=207426&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp Mon Apr 28 12:40:03 2014
@@ -143,6 +143,7 @@ Instruction *InstCombiner::PromoteCastOf
   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

Modified: llvm/trunk/test/Transforms/InstCombine/alloca.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/alloca.ll?rev=207426&r1=207425&r2=207426&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/alloca.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/alloca.ll Mon Apr 28 12:40:03 2014
@@ -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
+}