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Fix an issue where GVN would try to use an instruction before its definition when performing return slot optimization.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47541 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-02-25 00:40:41 +00:00
parent 14fd63cae8
commit 0f7ea1ab10
3 changed files with 33 additions and 1 deletions
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7
lib/Transforms/Scalar/GVN.cpp
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@ -1099,6 +1099,13 @@ bool GVN::performReturnSlotOptzn(MemCpyInst* cpy, CallInst* C,
!CS.paramHasAttr(1, ParamAttr::NoAlias | ParamAttr::StructRet))
return false;
// Since we're changing the parameter to the callsite, we need to make sure
// that what would be the new parameter dominates the callsite.
DominatorTree& DT = getAnalysis<DominatorTree>();
if (Instruction* cpyDestInst = dyn_cast<Instruction>(cpyDest))
if (!DT.dominates(cpyDestInst, C))
return false;
// Check that something sneaky is not happening involving casting
// return slot types around.
if (CS.getArgument(0)->getType() != cpyDest->getType())

25
test/Transforms/GVN/2008-02-24-NonDominatedMemcpy.ll Normal file
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@ -0,0 +1,25 @@
; RUN: llvm-as < %s | opt -gvn -dse | llvm-dis | grep {call.*memcpy} | count 1
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
target triple = "x86_64-apple-darwin8"
%struct.ggFrame3 = type { %struct.ggPoint3, %struct.ggONB3 }
%struct.ggHMatrix3 = type { [4 x [4 x double]] }
%struct.ggONB3 = type { %struct.ggPoint3, %struct.ggPoint3, %struct.ggPoint3 }
%struct.ggPoint3 = type { [3 x double] }
%struct.ggQuaternion = type { [4 x double], i32, %struct.ggHMatrix3 }
declare void @llvm.memcpy.i64(i8*, i8*, i64, i32) nounwind
define void @_Z10ggCRSplineRK8ggFrame3S1_S1_S1_d(%struct.ggFrame3* noalias sret %agg.result, %struct.ggFrame3* %f0, %struct.ggFrame3* %f1, %struct.ggFrame3* %f2, %struct.ggFrame3* %f3, double %t) nounwind {
entry:
%qresult = alloca %struct.ggQuaternion ; <%struct.ggQuaternion*> [#uses=1]
%tmp = alloca %struct.ggONB3 ; <%struct.ggONB3*> [#uses=2]
call void @_ZN12ggQuaternion7getONB3Ev( %struct.ggONB3* noalias sret %tmp, %struct.ggQuaternion* %qresult ) nounwind
%tmp1.i = getelementptr %struct.ggFrame3* %agg.result, i32 0, i32 1 ; <%struct.ggONB3*> [#uses=1]
%tmp13.i = bitcast %struct.ggONB3* %tmp1.i to i8* ; <i8*> [#uses=1]
%tmp24.i = bitcast %struct.ggONB3* %tmp to i8* ; <i8*> [#uses=1]
call void @llvm.memcpy.i64( i8* %tmp13.i, i8* %tmp24.i, i64 72, i32 8 ) nounwind
ret void
}
declare void @_ZN12ggQuaternion7getONB3Ev(%struct.ggONB3* noalias sret , %struct.ggQuaternion*) nounwind

2
test/Transforms/GVN/memcpy.ll
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@ -1,4 +1,4 @@
; RUN: llvm-as < %s | opt -gvn -dse | llvm-dis | grep memcpy | count 2
; RUN: llvm-as < %s | opt -gvn -dse | llvm-dis | grep {call.*memcpy} | count 1
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-apple-darwin9"