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AArch64: make FastISel memcpy emission more robust.

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We were hitting an assert if FastISel couldn't create the load or store we
requested. Currently this happens for large frame-local addresses, though
CodeGen could be improved there.

rdar://problem/17187463

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210519 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2014-06-10 09:52:40 +00:00
parent 48a7c150fc
commit 292c7c6a48
2 changed files with 14 additions and 3 deletions
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8
lib/Target/AArch64/AArch64FastISel.cpp
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@ -1460,10 +1460,12 @@ bool AArch64FastISel::TryEmitSmallMemCpy(Address Dest, Address Src,
bool RV;
unsigned ResultReg;
RV = EmitLoad(VT, ResultReg, Src);
assert(RV == true && "Should be able to handle this load.");
if (!RV)
return false;
RV = EmitStore(VT, ResultReg, Dest);
assert(RV == true && "Should be able to handle this store.");
(void)RV;
if (!RV)
return false;
int64_t Size = VT.getSizeInBits() / 8;
Len -= Size;

9
test/CodeGen/AArch64/arm64-fast-isel-intrinsic.ll
View File

@ -133,3 +133,12 @@ define void @t8() {
call void @llvm.memcpy.p0i8.p0i8.i64(i8* getelementptr inbounds ([80 x i8]* @temp, i32 0, i32 0), i8* getelementptr inbounds ([80 x i8]* @message, i32 0, i32 0), i64 4, i32 1, i1 false)
ret void
}
define void @test_distant_memcpy(i8* %dst) {
; ARM64-LABEL: test_distant_memcpy:
; ARM64: bl _memcpy
%array = alloca i8, i32 8192
%elem = getelementptr i8* %array, i32 8000
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %elem, i64 4, i32 1, i1 false)
ret void
}