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"
21 #define DEBUG_TYPE "sparc-subtarget"
23 #define GET_SUBTARGETINFO_TARGET_DESC
24 #define GET_SUBTARGETINFO_CTOR
25 #include "SparcGenSubtargetInfo.inc"
27 void SparcSubtarget::anchor() { }
29 SparcSubtarget::SparcSubtarget(const std::string &TT, const std::string &CPU,
30 const std::string &FS, bool is64Bit) :
31 SparcGenSubtargetInfo(TT, CPU, FS),
33 V8DeprecatedInsts(false),
39 // Determine default and user specified characteristics
40 std::string CPUName = CPU;
42 CPUName = (is64Bit) ? "v9" : "v8";
44 // Parse features string.
45 ParseSubtargetFeatures(CPUName, FS);
47 // Popc is a v9-only instruction.
53 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
56 // All 64-bit stack frames must be 16-byte aligned, and must reserve space
57 // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
59 // Frames with calls must also reserve space for 6 outgoing arguments
60 // whether they are used or not. LowerCall_64 takes care of that.
61 assert(frameSize % 16 == 0 && "Stack size not 16-byte aligned");
63 // Emit the correct save instruction based on the number of bytes in
64 // the frame. Minimum stack frame size according to V8 ABI is:
65 // 16 words for register window spill
66 // 1 word for address of returned aggregate-value
67 // + 6 words for passing parameters on the stack
69 // 23 words * 4 bytes per word = 92 bytes
72 // Round up to next doubleword boundary -- a double-word boundary
73 // is required by the ABI.
74 frameSize = RoundUpToAlignment(frameSize, 8);