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R600/SI: Add a note about the order of the operands to div_scale

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llvm-svn: 218534
This commit is contained in:
Matt Arsenault 2014-09-26 17:55:09 +00:00
parent 65a0508cab
commit c05b3987ac
1 changed files with 6 additions and 0 deletions
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6
lib/Target/R600/AMDGPUISelLowering.cpp
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@ -825,6 +825,12 @@ SDValue AMDGPUTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
// first parameter must be the same as the first instruction.
SDValue Numerator = Op.getOperand(1);
SDValue Denominator = Op.getOperand(2);
// Note this order is opposite of the machine instruction's operations,
// which is s0.f = Quotient, s1.f = Denominator, s2.f = Numerator. The
// intrinsic has the numerator as the first operand to match a normal
// division operation.
SDValue Src0 = Param->isAllOnesValue() ? Numerator : Denominator;
return DAG.getNode(AMDGPUISD::DIV_SCALE, DL, Op->getVTList(), Src0,