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author | Chad Rosier <mcrosier@codeaurora.org> | 2014-04-09 20:43:40 +0000 |
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committer | Chad Rosier <mcrosier@codeaurora.org> | 2014-04-09 20:43:40 +0000 |
commit | fe5c9cee80cea161963673083ca63cfd6d031bac (patch) | |
tree | 0b53699596c20552bf9bf06c9141e4ac4b9557a1 /lib | |
parent | e4b14ebcbd93443119efb3b7ef1b90c0e1cbcc3c (diff) | |
download | llvm-fe5c9cee80cea161963673083ca63cfd6d031bac.tar.gz llvm-fe5c9cee80cea161963673083ca63cfd6d031bac.tar.bz2 llvm-fe5c9cee80cea161963673083ca63cfd6d031bac.tar.xz |
[AArch64] Implement the isTruncateFree API.
In AArch64 i64 to i32 truncate operation is a subregister access.
This allows more opportunities for LSR optmization to eliminate
variables of different types (i32 and i64).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205925 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
-rw-r--r-- | lib/Target/AArch64/AArch64ISelLowering.cpp | 21 | ||||
-rw-r--r-- | lib/Target/AArch64/AArch64ISelLowering.h | 4 |
2 files changed, 25 insertions, 0 deletions
diff --git a/lib/Target/AArch64/AArch64ISelLowering.cpp b/lib/Target/AArch64/AArch64ISelLowering.cpp index 2edb19281d..7accadc6a0 100644 --- a/lib/Target/AArch64/AArch64ISelLowering.cpp +++ b/lib/Target/AArch64/AArch64ISelLowering.cpp @@ -5368,3 +5368,24 @@ bool AArch64TargetLowering::getTgtMemIntrinsic(IntrinsicInfo &Info, return false; } + +// Truncations from 64-bit GPR to 32-bit GPR is free. +bool AArch64TargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const { + if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy()) + return false; + unsigned NumBits1 = Ty1->getPrimitiveSizeInBits(); + unsigned NumBits2 = Ty2->getPrimitiveSizeInBits(); + if (NumBits1 <= NumBits2) + return false; + return true; +} + +bool AArch64TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const { + if (!VT1.isInteger() || !VT2.isInteger()) + return false; + unsigned NumBits1 = VT1.getSizeInBits(); + unsigned NumBits2 = VT2.getSizeInBits(); + if (NumBits1 <= NumBits2) + return false; + return true; +} diff --git a/lib/Target/AArch64/AArch64ISelLowering.h b/lib/Target/AArch64/AArch64ISelLowering.h index e946b250e3..6a4b0c791f 100644 --- a/lib/Target/AArch64/AArch64ISelLowering.h +++ b/lib/Target/AArch64/AArch64ISelLowering.h @@ -277,6 +277,10 @@ public: SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const; bool isLegalICmpImmediate(int64_t Val) const; + + bool isTruncateFree(Type *Ty1, Type *Ty2) const override; + bool isTruncateFree(EVT VT1, EVT VT2) const override; + SDValue getSelectableIntSetCC(SDValue LHS, SDValue RHS, ISD::CondCode CC, SDValue &A64cc, SelectionDAG &DAG, SDLoc &dl) const; |