1 //===-- SparcSubtarget.cpp - SPARC Subtarget Information ------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the SPARC specific subclass of TargetSubtargetInfo.
12 //===----------------------------------------------------------------------===//
14 #include "SparcSubtarget.h"
16 #include "llvm/Support/MathExtras.h"
17 #include "llvm/Support/TargetRegistry.h"
19 #define GET_SUBTARGETINFO_TARGET_DESC
20 #define GET_SUBTARGETINFO_CTOR
21 #include "SparcGenSubtargetInfo.inc"
25 void SparcSubtarget::anchor() { }
27 SparcSubtarget::SparcSubtarget(const std::string &TT, const std::string &CPU,
28 const std::string &FS, bool is64Bit) :
29 SparcGenSubtargetInfo(TT, CPU, FS),
31 V8DeprecatedInsts(false),
37 // Determine default and user specified characteristics
38 std::string CPUName = CPU;
40 CPUName = (is64Bit) ? "v9" : "v8";
42 // Parse features string.
43 ParseSubtargetFeatures(CPUName, FS);
45 // Popc is a v9-only instruction.
51 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
54 // All 64-bit stack frames must be 16-byte aligned, and must reserve space
55 // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
57 // Frames with calls must also reserve space for 6 outgoing arguments
58 // whether they are used or not. LowerCall_64 takes care of that.
59 assert(frameSize % 16 == 0 && "Stack size not 16-byte aligned");
61 // Emit the correct save instruction based on the number of bytes in
62 // the frame. Minimum stack frame size according to V8 ABI is:
63 // 16 words for register window spill
64 // 1 word for address of returned aggregate-value
65 // + 6 words for passing parameters on the stack
67 // 23 words * 4 bytes per word = 92 bytes
70 // Round up to next doubleword boundary -- a double-word boundary
71 // is required by the ABI.
72 frameSize = RoundUpToAlignment(frameSize, 8);