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| author | Matt Arsenault <Matthew.Arsenault@amd.com> | 2014-02-10 19:57:42 +0000 |
|---|---|---|
| committer | Matt Arsenault <Matthew.Arsenault@amd.com> | 2014-02-10 19:57:42 +0000 |
| commit | 0cdcd961bf0cc747a1d93617d24bbcabacb818b0 (patch) | |
| tree | 7d9b9d46815cc4a1a72fed344a13490a799131fa | |
| parent | cc4a72ecd2bf724114c1e92bd7ddae405ed3c8a9 (diff) | |
| download | bcm5719-llvm-0cdcd961bf0cc747a1d93617d24bbcabacb818b0.tar.gz bcm5719-llvm-0cdcd961bf0cc747a1d93617d24bbcabacb818b0.zip | |
R600: Implement isTruncateFree
Truncation is just accessing a subregister for any multiple of
the register size, so it's free.
llvm-svn: 201107
| -rw-r--r-- | llvm/lib/Target/R600/AMDGPUISelLowering.cpp | 5 | ||||
| -rw-r--r-- | llvm/lib/Target/R600/AMDGPUISelLowering.h | 1 |
2 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/R600/AMDGPUISelLowering.cpp b/llvm/lib/Target/R600/AMDGPUISelLowering.cpp index 47f88c3f0c6..1df02d3f987 100644 --- a/llvm/lib/Target/R600/AMDGPUISelLowering.cpp +++ b/llvm/lib/Target/R600/AMDGPUISelLowering.cpp @@ -232,6 +232,11 @@ bool AMDGPUTargetLowering::isFNegFree(EVT VT) const { return VT == MVT::f32; } +bool AMDGPUTargetLowering::isTruncateFree(EVT, EVT Dest) const { + // Truncate is just accessing a subregister. + return (Dest.getSizeInBits() % 32 == 0); +} + //===---------------------------------------------------------------------===// // TargetLowering Callbacks //===---------------------------------------------------------------------===// diff --git a/llvm/lib/Target/R600/AMDGPUISelLowering.h b/llvm/lib/Target/R600/AMDGPUISelLowering.h index 9782b5e755a..311959e682b 100644 --- a/llvm/lib/Target/R600/AMDGPUISelLowering.h +++ b/llvm/lib/Target/R600/AMDGPUISelLowering.h @@ -81,6 +81,7 @@ public: virtual bool isFAbsFree(EVT VT) const; virtual bool isFNegFree(EVT VT) const; + virtual bool isTruncateFree(EVT Src, EVT Dest) const LLVM_OVERRIDE; virtual MVT getVectorIdxTy() const; virtual bool isLoadBitCastBeneficial(EVT, EVT) const LLVM_OVERRIDE; virtual SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, |
