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Use inbounds GEPs for memcpy and memset lowering

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Follow-up on discussion in http://reviews.llvm.org/D11220


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242542 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Bendersky 2015-07-17 16:42:33 +00:00
parent f82375c972
commit 27bd1ca0d9
2 changed files with 15 additions and 13 deletions
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18
lib/Target/NVPTX/NVPTXLowerAggrCopies.cpp
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@ -87,14 +87,15 @@ void convertMemCpyToLoop(Instruction *ConvertedInst, Value *SrcAddr,
// load from SrcAddr+LoopIndex
// TODO: we can leverage the align parameter of llvm.memcpy for more efficient
// word-sized loads and stores.
Value *Element = LoopBuilder.CreateLoad(
LoopBuilder.CreateGEP(LoopBuilder.getInt8Ty(), SrcAddr, LoopIndex),
SrcIsVolatile);
Value *Element =
LoopBuilder.CreateLoad(LoopBuilder.CreateInBoundsGEP(
LoopBuilder.getInt8Ty(), SrcAddr, LoopIndex),
SrcIsVolatile);
// store at DstAddr+LoopIndex
LoopBuilder.CreateStore(
Element,
LoopBuilder.CreateGEP(LoopBuilder.getInt8Ty(), DstAddr, LoopIndex),
DstIsVolatile);
LoopBuilder.CreateStore(Element,
LoopBuilder.CreateInBoundsGEP(LoopBuilder.getInt8Ty(),
DstAddr, LoopIndex),
DstIsVolatile);
// The value for LoopIndex coming from backedge is (LoopIndex + 1)
Value *NewIndex =
@ -225,7 +226,8 @@ void convertMemSetToLoop(Instruction *ConvertedInst, Value *DstAddr,
LoopIndex->addIncoming(ConstantInt::get(CopyLen->getType(), 0), OrigBB);
LoopBuilder.CreateStore(
SetValue, LoopBuilder.CreateGEP(SetValue->getType(), DstAddr, LoopIndex),
SetValue,
LoopBuilder.CreateInBoundsGEP(SetValue->getType(), DstAddr, LoopIndex),
false);
Value *NewIndex =

10
test/CodeGen/NVPTX/lower-aggr-copies.ll
View File

@ -18,9 +18,9 @@ entry:
; IR-LABEL: @memcpy_caller
; IR: loadstoreloop:
; IR: [[LOADPTR:%[0-9]+]] = getelementptr i8, i8* %src, i64
; IR: [[LOADPTR:%[0-9]+]] = getelementptr inbounds i8, i8* %src, i64
; IR-NEXT: [[VAL:%[0-9]+]] = load i8, i8* [[LOADPTR]]
; IR-NEXT: [[STOREPTR:%[0-9]+]] = getelementptr i8, i8* %dst, i64
; IR-NEXT: [[STOREPTR:%[0-9]+]] = getelementptr inbounds i8, i8* %dst, i64
; IR-NEXT: store i8 [[VAL]], i8* [[STOREPTR]]
; PTX-LABEL: .visible .func (.param .b64 func_retval0) memcpy_caller
@ -61,8 +61,8 @@ entry:
; IR-LABEL: @memcpy_casting_caller
; IR: [[DSTCAST:%[0-9]+]] = bitcast i32* %dst to i8*
; IR: [[SRCCAST:%[0-9]+]] = bitcast i32* %src to i8*
; IR: getelementptr i8, i8* [[SRCCAST]]
; IR: getelementptr i8, i8* [[DSTCAST]]
; IR: getelementptr inbounds i8, i8* [[SRCCAST]]
; IR: getelementptr inbounds i8, i8* [[DSTCAST]]
}
define i8* @memset_caller(i8* %dst, i32 %c, i64 %n) #0 {
@ -74,7 +74,7 @@ entry:
; IR-LABEL: @memset_caller
; IR: [[VAL:%[0-9]+]] = trunc i32 %c to i8
; IR: loadstoreloop:
; IR: [[STOREPTR:%[0-9]+]] = getelementptr i8, i8* %dst, i64
; IR: [[STOREPTR:%[0-9]+]] = getelementptr inbounds i8, i8* %dst, i64
; IR-NEXT: store i8 [[VAL]], i8* [[STOREPTR]]
; PTX-LABEL: .visible .func (.param .b64 func_retval0) memset_caller(