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[AArch64]Add support to copy D tuples such as DPair/DTriple/DQuad and Q tuples such as QPair/QTriple/QQuad. There is no test case for D tuple as the original test cases are too large. As the copy of the D tuple is similar to the Q tuple, the correctness can be guaranteed.

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llvm-svn: 198682
This commit is contained in:
Hao Liu 2014-01-07 10:00:03 +00:00
parent 69760d5a12
commit bbb265cfee
3 changed files with 101 additions and 1 deletions
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52
lib/Target/AArch64/AArch64InstrInfo.cpp
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@ -134,7 +134,8 @@ void AArch64InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
return;
}
} else {
llvm_unreachable("Unknown register class in copyPhysReg");
CopyPhysRegTuple(MBB, I, DL, DestReg, SrcReg);
return;
}
// E.g. ORR xDst, xzr, xSrc, lsl #0
@ -144,6 +145,55 @@ void AArch64InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
.addImm(0);
}
void AArch64InstrInfo::CopyPhysRegTuple(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
DebugLoc DL, unsigned DestReg,
unsigned SrcReg) const {
unsigned SubRegs;
bool IsQRegs;
if (AArch64::DPairRegClass.contains(DestReg, SrcReg)) {
SubRegs = 2;
IsQRegs = false;
} else if (AArch64::DTripleRegClass.contains(DestReg, SrcReg)) {
SubRegs = 3;
IsQRegs = false;
} else if (AArch64::DQuadRegClass.contains(DestReg, SrcReg)) {
SubRegs = 4;
IsQRegs = false;
} else if (AArch64::QPairRegClass.contains(DestReg, SrcReg)) {
SubRegs = 2;
IsQRegs = true;
} else if (AArch64::QTripleRegClass.contains(DestReg, SrcReg)) {
SubRegs = 3;
IsQRegs = true;
} else if (AArch64::QQuadRegClass.contains(DestReg, SrcReg)) {
SubRegs = 4;
IsQRegs = true;
} else
llvm_unreachable("Unknown register class");
unsigned BeginIdx = IsQRegs ? AArch64::qsub_0 : AArch64::dsub_0;
int Spacing = 1;
const TargetRegisterInfo *TRI = &getRegisterInfo();
// Copy register tuples backward when the first Dest reg overlaps
// with SrcReg.
if (TRI->regsOverlap(SrcReg, TRI->getSubReg(DestReg, BeginIdx))) {
BeginIdx = BeginIdx + (SubRegs - 1);
Spacing = -1;
}
unsigned Opc = IsQRegs ? AArch64::ORRvvv_16B : AArch64::ORRvvv_8B;
for (unsigned i = 0; i != SubRegs; ++i) {
unsigned Dst = TRI->getSubReg(DestReg, BeginIdx + i * Spacing);
unsigned Src = TRI->getSubReg(SrcReg, BeginIdx + i * Spacing);
assert(Dst && Src && "Bad sub-register");
BuildMI(MBB, I, I->getDebugLoc(), get(Opc), Dst)
.addReg(Src)
.addReg(Src);
}
return;
}
/// Does the Opcode represent a conditional branch that we can remove and re-add
/// at the end of a basic block?
static bool isCondBranch(unsigned Opc) {

3
lib/Target/AArch64/AArch64InstrInfo.h
View File

@ -42,6 +42,9 @@ public:
MachineBasicBlock::iterator I, DebugLoc DL,
unsigned DestReg, unsigned SrcReg,
bool KillSrc) const;
void CopyPhysRegTuple(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I, DebugLoc DL,
unsigned DestReg, unsigned SrcReg) const;
void storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,

47
test/CodeGen/AArch64/neon-copyPhysReg-tuple.ll Normal file
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@ -0,0 +1,47 @@
; RUN: llc < %s -verify-machineinstrs -mtriple=aarch64-none-linux-gnu -mattr=+neon | FileCheck %s
define <4 x i32> @copyTuple.QPair(i8* %a, i8* %b) {
; CHECK-LABEL: copyTuple.QPair:
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: ld2 {{{v[0-9]+}}.s, {{v[0-9]+}}.s}[{{[0-9]+}}], [x{{[0-9]+|sp}}]
entry:
%vld = tail call { <4 x i32>, <4 x i32> } @llvm.arm.neon.vld2lane.v4i32(i8* %a, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> <i32 2, i32 2, i32 2, i32 2>, i32 0, i32 4)
%extract = extractvalue { <4 x i32>, <4 x i32> } %vld, 0
%vld1 = tail call { <4 x i32>, <4 x i32> } @llvm.arm.neon.vld2lane.v4i32(i8* %b, <4 x i32> %extract, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, i32 1, i32 4)
%vld1.fca.0.extract = extractvalue { <4 x i32>, <4 x i32> } %vld1, 0
ret <4 x i32> %vld1.fca.0.extract
}
define <4 x i32> @copyTuple.QTriple(i8* %a, i8* %b, <4 x i32> %c) {
; CHECK-LABEL: copyTuple.QTriple:
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: ld3 {{{v[0-9]+}}.s, {{v[0-9]+}}.s, {{v[0-9]+}}.s}[{{[0-9]+}}], [x{{[0-9]+|sp}}]
entry:
%vld = tail call { <4 x i32>, <4 x i32>, <4 x i32> } @llvm.arm.neon.vld3lane.v4i32(i8* %a, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %c, <4 x i32> %c, i32 0, i32 4)
%extract = extractvalue { <4 x i32>, <4 x i32>, <4 x i32> } %vld, 0
%vld1 = tail call { <4 x i32>, <4 x i32>, <4 x i32> } @llvm.arm.neon.vld3lane.v4i32(i8* %b, <4 x i32> %extract, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %c, i32 1, i32 4)
%vld1.fca.0.extract = extractvalue { <4 x i32>, <4 x i32>, <4 x i32> } %vld1, 0
ret <4 x i32> %vld1.fca.0.extract
}
define <4 x i32> @copyTuple.QQuad(i8* %a, i8* %b, <4 x i32> %c) {
; CHECK-LABEL: copyTuple.QQuad:
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: orr v{{[0-9]+}}.16b, v{{[0-9]+}}.16b, v{{[0-9]+}}.16b
; CHECK: ld4 {{{v[0-9]+}}.s, {{v[0-9]+}}.s, {{v[0-9]+}}.s, {{v[0-9]+}}.s}[{{[0-9]+}}], [x{{[0-9]+|sp}}]
entry:
%vld = tail call { <4 x i32>, <4 x i32>, <4 x i32>, <4 x i32> } @llvm.arm.neon.vld4lane.v4i32(i8* %a, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %c, <4 x i32> %c, <4 x i32> %c, i32 0, i32 4)
%extract = extractvalue { <4 x i32>, <4 x i32>, <4 x i32>, <4 x i32> } %vld, 0
%vld1 = tail call { <4 x i32>, <4 x i32>, <4 x i32>, <4 x i32> } @llvm.arm.neon.vld4lane.v4i32(i8* %b, <4 x i32> %extract, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %c, <4 x i32> %c, i32 1, i32 4)
%vld1.fca.0.extract = extractvalue { <4 x i32>, <4 x i32>, <4 x i32>, <4 x i32> } %vld1, 0
ret <4 x i32> %vld1.fca.0.extract
}
declare { <4 x i32>, <4 x i32> } @llvm.arm.neon.vld2lane.v4i32(i8*, <4 x i32>, <4 x i32>, i32, i32)
declare { <4 x i32>, <4 x i32>, <4 x i32> } @llvm.arm.neon.vld3lane.v4i32(i8*, <4 x i32>, <4 x i32>, <4 x i32>, i32, i32)
declare { <4 x i32>, <4 x i32>, <4 x i32>, <4 x i32> } @llvm.arm.neon.vld4lane.v4i32(i8*, <4 x i32>, <4 x i32>, <4 x i32>, <4 x i32>, i32, i32)