Difference between revisions of "Extending NaplesPU for 64-bit support"
From NaplesPU Documentation
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== nu+ Backend Modifications == | == nu+ Backend Modifications == | ||
| + | |||
| + | This section describes the backend modification to be applied for 64-bit support. | ||
| + | |||
| + | === Registers Definition === | ||
| + | |||
| + | foreach i = 0-28 in { | ||
| + | def S#!shl(i, 1)#_S#!add(!shl(i, 1), 1) : NuPlus64GPRReg<!shl(i, 1), "s"#!shl(i, 1)#_64, | ||
| + | [!cast<NuPlusGPRReg>("S"#!shl(i, 1)), | ||
| + | !cast<NuPlusGPRReg>("S"#!add(!shl(i, 1), 1))]>; | ||
| + | } | ||
Revision as of 15:54, 5 April 2019
nu+ toolchain can be extended to support 64-bit operations. A git branch with full 64-bit support is provided. Consequently, if it is necessary to compile the toolchain supporting this extension, a checkout on llvm-7 branch is required.
Changes are related to both frontend and backend.
nu+ Frontend Modifications
nu+ frontend abstracts target informations through the TargetInfo class, extending it in the NuPlusTargetInfo implementation.
Since 64-bit operations require to support double-integer and double-floating-point formats, the following changes and additions are required in the target definition:
class LLVM_LIBRARY_VISIBILITY NuPlusTargetInfo : public TargetInfo {
...
public:
NuPlusTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
: TargetInfo(Triple) {
...
resetDataLayout("e-m:e-p:32:32-i64:64:64-i32:32:32-f32:32:32-f64:64:64");
LongDoubleWidth = 64;
LongDoubleAlign = 64;
DoubleWidth = 64;
DoubleAlign = 64;
LongWidth = 64;
LongAlign = 64;
LongLongWidth = 64;
LongLongAlign = 64;
}nu+ Backend Modifications
This section describes the backend modification to be applied for 64-bit support.
Registers Definition
foreach i = 0-28 in {
def S#!shl(i, 1)#_S#!add(!shl(i, 1), 1) : NuPlus64GPRReg<!shl(i, 1), "s"#!shl(i, 1)#_64,
[!cast<NuPlusGPRReg>("S"#!shl(i, 1)),
!cast<NuPlusGPRReg>("S"#!add(!shl(i, 1), 1))]>;
}
