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Revision r128665 added an optimization to make use of NEON multiplier

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accumulator forwarding.  Specifically (from SVN log entry):

Distribute (A + B) * C to (A * C) + (B * C) to make use of NEON multiplier
accumulator forwarding:
vadd d3, d0, d1
vmul d3, d3, d2
=>
vmul d3, d0, d2
vmla d3, d1, d2

Make sure it catches cases where operand 1 is add/fadd/sub/fsub, which was
intended in the original revision.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133127 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2011-06-16 01:21:54 +00:00
parent c06b5bf340
commit 689edc8b28
2 changed files with 23 additions and 1 deletions
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2
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -5687,7 +5687,7 @@ static SDValue PerformVMULCombine(SDNode *N,
unsigned Opcode = N0.getOpcode();
if (Opcode != ISD::ADD && Opcode != ISD::SUB &&
Opcode != ISD::FADD && Opcode != ISD::FSUB) {
Opcode = N0.getOpcode();
Opcode = N1.getOpcode();
if (Opcode != ISD::ADD && Opcode != ISD::SUB &&
Opcode != ISD::FADD && Opcode != ISD::FSUB)
return SDValue();

22
test/CodeGen/ARM/vmul.ll
View File

@ -492,3 +492,25 @@ entry:
store <8 x i8> %10, <8 x i8>* %11, align 8
ret void
}
define void @distribute2_commutative(%struct.uint8x8_t* nocapture %dst, i8* %src, i32 %mul) nounwind {
entry:
; CHECK: distribute2_commutative
; CHECK-NOT: vadd.i8
; CHECK: vmul.i8
; CHECK: vmla.i8
%0 = trunc i32 %mul to i8
%1 = insertelement <8 x i8> undef, i8 %0, i32 0
%2 = shufflevector <8 x i8> %1, <8 x i8> undef, <8 x i32> zeroinitializer
%3 = tail call <16 x i8> @llvm.arm.neon.vld1.v16i8(i8* %src, i32 1)
%4 = bitcast <16 x i8> %3 to <2 x double>
%5 = extractelement <2 x double> %4, i32 1
%6 = bitcast double %5 to <8 x i8>
%7 = extractelement <2 x double> %4, i32 0
%8 = bitcast double %7 to <8 x i8>
%9 = add <8 x i8> %6, %8
%10 = mul <8 x i8> %2, %9
%11 = getelementptr inbounds %struct.uint8x8_t* %dst, i32 0, i32 0
store <8 x i8> %10, <8 x i8>* %11, align 8
ret void
}