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R600: Implement a few simple TTI queries.

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I'm not sure if these have any effect right now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213455 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-07-19 18:15:16 +00:00
parent 4df656952a
commit fd22980d6b
1 changed files with 24 additions and 0 deletions
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24
lib/Target/R600/AMDGPUTargetTransformInfo.cpp
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@ -79,6 +79,10 @@ public:
PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const override;
unsigned getNumberOfRegisters(bool Vector) const override;
unsigned getRegisterBitWidth(bool Vector) const override;
unsigned getMaximumUnrollFactor() const override;
/// @}
};
@ -127,3 +131,23 @@ AMDGPUTTI::getPopcntSupport(unsigned TyWidth) const {
assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
return ST->hasBCNT(TyWidth) ? PSK_FastHardware : PSK_Software;
}
unsigned AMDGPUTTI::getNumberOfRegisters(bool Vec) const {
if (Vec)
return 0;
// Number of VGPRs on SI.
if (ST->getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS)
return 256;
return 4 * 128; // XXX - 4 channels. Should these count as vector instead?
}
unsigned AMDGPUTTI::getRegisterBitWidth(bool) const {
return 32;
}
unsigned AMDGPUTTI::getMaximumUnrollFactor() const {
// Semi-arbitrary large amount.
return 64;
}