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| author | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-04-04 23:26:21 +0000 |
|---|---|---|
| committer | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-04-04 23:26:21 +0000 |
| commit | b977387112a6b89fa5ad987016194542377cdc99 (patch) | |
| tree | c1f2453e80639afaffe147824826304139fbdfce /llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp | |
| parent | bdcb4464e2bc50cc24fd5d81018c1f7ab4695f1b (diff) | |
| download | llvm-b977387112a6b89fa5ad987016194542377cdc99.zip llvm-b977387112a6b89fa5ad987016194542377cdc99.tar.gz llvm-b977387112a6b89fa5ad987016194542377cdc99.tar.bz2 | |
CostModel: Add parameter to instruction cost to further classify operand values
On certain architectures we can support efficient vectorized version of
instructions if the operand value is uniform (splat) or a constant scalar.
An example of this is a vector shift on x86.
We can efficiently support
for (i = 0 ; i < ; i += 4)
w[0:3] = v[0:3] << <2, 2, 2, 2>
but not
for (i = 0; i < ; i += 4)
w[0:3] = v[0:3] << x[0:3]
This patch adds a parameter to getArithmeticInstrCost to further qualify operand
values as uniform or uniform constant.
Targets can then choose to return a different cost for instructions with such
operand values.
A follow-up commit will test this feature on x86.
radar://13576547
llvm-svn: 178807
Diffstat (limited to 'llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp index 00037ed..2504ba7 100644 --- a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp +++ b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp @@ -86,7 +86,9 @@ public: virtual unsigned getNumberOfRegisters(bool Vector) const; virtual unsigned getRegisterBitWidth(bool Vector) const; virtual unsigned getMaximumUnrollFactor() const; - virtual unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty) const; + virtual unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty, + OperandValueKind, + OperandValueKind) const; virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp, int Index, Type *SubTp) const; virtual unsigned getCastInstrCost(unsigned Opcode, Type *Dst, @@ -166,11 +168,14 @@ unsigned PPCTTI::getMaximumUnrollFactor() const { return 2; } -unsigned PPCTTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty) const { +unsigned PPCTTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty, + OperandValueKind Op1Info, + OperandValueKind Op2Info) const { assert(TLI->InstructionOpcodeToISD(Opcode) && "Invalid opcode"); // Fallback to the default implementation. - return TargetTransformInfo::getArithmeticInstrCost(Opcode, Ty); + return TargetTransformInfo::getArithmeticInstrCost(Opcode, Ty, Op1Info, + Op2Info); } unsigned PPCTTI::getShuffleCost(ShuffleKind Kind, Type *Tp, int Index, |