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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 | 700bba297ba8a99c5dfd31ceaa894fbd1496a03e (patch) | |
| tree | bd6585d253578cad7fb0bad810aa96fb63c0dc88 | |
| parent | d5a9ea8afe53af7b4436da8b1cb42a5388d6e62a (diff) | |
| download | llvm-700bba297ba8a99c5dfd31ceaa894fbd1496a03e.tar.gz llvm-700bba297ba8a99c5dfd31ceaa894fbd1496a03e.tar.bz2 llvm-700bba297ba8a99c5dfd31ceaa894fbd1496a03e.tar.xz | |
R600: Implement isTruncateFree
Truncation is just accessing a subregister for any multiple of
the register size, so it's free.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201107 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/R600/AMDGPUISelLowering.cpp | 5 | ||||
| -rw-r--r-- | lib/Target/R600/AMDGPUISelLowering.h | 1 |
2 files changed, 6 insertions, 0 deletions
diff --git a/lib/Target/R600/AMDGPUISelLowering.cpp b/lib/Target/R600/AMDGPUISelLowering.cpp index 47f88c3f0c..1df02d3f98 100644 --- a/lib/Target/R600/AMDGPUISelLowering.cpp +++ b/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/lib/Target/R600/AMDGPUISelLowering.h b/lib/Target/R600/AMDGPUISelLowering.h index 9782b5e755..311959e682 100644 --- a/lib/Target/R600/AMDGPUISelLowering.h +++ b/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, |