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If there's an unaligned memcpy to/from the stack, don't lower it. Just call the

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memcpy library function instead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43270 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2007-10-23 23:32:40 +00:00
parent 79217064c6
commit 8b1c68cee4
2 changed files with 26 additions and 0 deletions
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13
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -4329,6 +4329,19 @@ void SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) {
}
}
// Check to see if there is an unaligned memcpy from/onto the stack. If
// so, then ignore it for the present.
if (Op1.getOpcode() == ISD::FrameIndex ||
Op2.getOpcode() == ISD::FrameIndex) {
unsigned TotalSize = 0;
for (unsigned i = 0; i < NumMemOps; i++)
TotalSize += MVT::getSizeInBits(MemOps[i]) / 8;
if (TotalSize % Align != 0)
break;
}
for (unsigned i = 0; i < NumMemOps; i++) {
MVT::ValueType VT = MemOps[i];
unsigned VTSize = MVT::getSizeInBits(VT) / 8;

13
test/CodeGen/PowerPC/2007-10-23-UnalignedMemcpy.ll Normal file
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@ -0,0 +1,13 @@
; RUN: llvm-as < %s | llc -mtriple=powerpc64-apple-darwin9 -o - | grep memcpy
@C.0.1173 = external constant [33 x i8] ; <[33 x i8]*> [#uses=1]
define void @Bork() {
entry:
%Qux = alloca [33 x i8] ; <[33 x i8]*> [#uses=1]
%Qux1 = bitcast [33 x i8]* %Qux to i8* ; <i8*> [#uses=1]
call void @llvm.memcpy.i64( i8* %Qux1, i8* getelementptr ([33 x i8]* @C.0.1173, i32 0, i32 0), i64 33, i32 8 )
ret void
}
declare void @llvm.memcpy.i64(i8*, i8*, i64, i32)