1//===-- SparcSubtarget.cpp - SPARC Subtarget Information ------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the SPARC specific subclass of TargetSubtargetInfo.
11//
12//===----------------------------------------------------------------------===//
13
14#include "SparcSubtarget.h"
15#include "Sparc.h"
16#include "llvm/Support/MathExtras.h"
17#include "llvm/Support/TargetRegistry.h"
18
19#define GET_SUBTARGETINFO_TARGET_DESC
20#define GET_SUBTARGETINFO_CTOR
21#include "SparcGenSubtargetInfo.inc"
22
23using namespace llvm;
24
25void SparcSubtarget::anchor() { }
26
27SparcSubtarget::SparcSubtarget(const std::string &TT, const std::string &CPU,
28 const std::string &FS, bool is64Bit) :
29 SparcGenSubtargetInfo(TT, CPU, FS),
30 IsV9(false),
31 V8DeprecatedInsts(false),
32 IsVIS(false),
33 Is64Bit(is64Bit),
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34 HasHardQuad(false) {
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34 HasHardQuad(false),
35 UsePopc(false) { |
36
37 // Determine default and user specified characteristics
38 std::string CPUName = CPU;
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38 if (CPUName.empty()) {
39 if (is64Bit)
40 CPUName = "v9";
41 else
42 CPUName = "v8";
43 }
44 IsV9 = CPUName == "v9";
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39 if (CPUName.empty())
40 CPUName = (is64Bit) ? "v9" : "v8"; |
41
42 // Parse features string.
43 ParseSubtargetFeatures(CPUName, FS);
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44
45 // Popc is a v9-only instruction.
46 if (!IsV9)
47 UsePopc = false; |
48}
49
50
51int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
52
53 if (is64Bit()) {
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.
56 frameSize += 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");
60 } else {
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
66 // ----------
67 // 23 words * 4 bytes per word = 92 bytes
68 frameSize += 92;
69
70 // Round up to next doubleword boundary -- a double-word boundary
71 // is required by the ABI.
72 frameSize = RoundUpToAlignment(frameSize, 8);
73 }
74 return frameSize;
75}
|