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[SelectionDAG] Use the correct return type for memcpy, memmove, and memset.

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When generating calls to memcpy, memmove, and memset, use void* as the return
type rather than void, to match the standard signatures for these functions.

This has no practical effect for most targets, since the return values of
these calls aren't being used anyway, and most calling conventions tolerate
this kind of mismatch. However, this change will help support future
optimizations to utilize the return value to avoid holding the argument
value live across a call.

llvm-svn: 258691
This commit is contained in:
Dan Gohman 2016-01-25 15:05:56 +00:00
parent fe66a6200d
commit 105451ecf0
2 changed files with 4 additions and 4 deletions
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6
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -4662,7 +4662,7 @@ SDValue SelectionDAG::getMemcpy(SDValue Chain, SDLoc dl, SDValue Dst,
CLI.setDebugLoc(dl)
.setChain(Chain)
.setCallee(TLI->getLibcallCallingConv(RTLIB::MEMCPY),
Type::getVoidTy(*getContext()),
Dst.getValueType().getTypeForEVT(*getContext()),
getExternalSymbol(TLI->getLibcallName(RTLIB::MEMCPY),
TLI->getPointerTy(getDataLayout())),
std::move(Args), 0)
@ -4723,7 +4723,7 @@ SDValue SelectionDAG::getMemmove(SDValue Chain, SDLoc dl, SDValue Dst,
CLI.setDebugLoc(dl)
.setChain(Chain)
.setCallee(TLI->getLibcallCallingConv(RTLIB::MEMMOVE),
Type::getVoidTy(*getContext()),
Dst.getValueType().getTypeForEVT(*getContext()),
getExternalSymbol(TLI->getLibcallName(RTLIB::MEMMOVE),
TLI->getPointerTy(getDataLayout())),
std::move(Args), 0)
@ -4785,7 +4785,7 @@ SDValue SelectionDAG::getMemset(SDValue Chain, SDLoc dl, SDValue Dst,
CLI.setDebugLoc(dl)
.setChain(Chain)
.setCallee(TLI->getLibcallCallingConv(RTLIB::MEMSET),
Type::getVoidTy(*getContext()),
Dst.getValueType().getTypeForEVT(*getContext()),
getExternalSymbol(TLI->getLibcallName(RTLIB::MEMSET),
TLI->getPointerTy(getDataLayout())),
std::move(Args), 0)

2
test/CodeGen/WebAssembly/global.ll
View File

@ -21,7 +21,7 @@ define i32 @foo() {
; CHECK-LABEL: call_memcpy:
; CHECK-NEXT: .param i32, i32, i32{{$}}
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: call memcpy@FUNCTION, $0, $1, $2{{$}}
; CHECK-NEXT: i32.call $discard=, memcpy@FUNCTION, $0, $1, $2{{$}}
; CHECK-NEXT: return $0{{$}}
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture readonly, i32, i32, i1)
define i8* @call_memcpy(i8* %p, i8* nocapture readonly %q, i32 %n) {