1 //===-- X86InstComments.cpp - Generate verbose-asm comments for instrs ----===//
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 defines functionality used to emit comments about X86 instructions to
11 // an output stream for -fverbose-asm.
13 //===----------------------------------------------------------------------===//
15 #include "X86InstComments.h"
16 #include "X86GenInstrNames.inc"
17 #include "llvm/MC/MCInst.h"
18 #include "llvm/Support/raw_ostream.h"
19 #include "../X86ShuffleDecode.h"
22 //===----------------------------------------------------------------------===//
23 // Top Level Entrypoint
24 //===----------------------------------------------------------------------===//
26 /// EmitAnyX86InstComments - This function decodes x86 instructions and prints
27 /// newline terminated strings to the specified string if desired. This
28 /// information is shown in disassembly dumps when verbose assembly is enabled.
29 void llvm::EmitAnyX86InstComments(const MCInst *MI, raw_ostream &OS,
30 const char *(*getRegName)(unsigned)) {
31 // If this is a shuffle operation, the switch should fill in this state.
32 SmallVector<unsigned, 8> ShuffleMask;
33 const char *DestName = 0, *Src1Name = 0, *Src2Name = 0;
35 switch (MI->getOpcode()) {
37 Src1Name = getRegName(MI->getOperand(1).getReg());
38 Src2Name = getRegName(MI->getOperand(2).getReg());
39 DecodeINSERTPSMask(MI->getOperand(3).getImm(), ShuffleMask);
43 Src2Name = getRegName(MI->getOperand(2).getReg());
44 Src1Name = getRegName(MI->getOperand(0).getReg());
45 DecodeMOVLHPSMask(2, ShuffleMask);
49 Src2Name = getRegName(MI->getOperand(2).getReg());
50 Src1Name = getRegName(MI->getOperand(0).getReg());
51 DecodeMOVHLPSMask(2, ShuffleMask);
55 Src1Name = getRegName(MI->getOperand(1).getReg());
58 DestName = getRegName(MI->getOperand(0).getReg());
59 DecodePSHUFMask(4, MI->getOperand(MI->getNumOperands()-1).getImm(),
64 Src1Name = getRegName(MI->getOperand(1).getReg());
67 DestName = getRegName(MI->getOperand(0).getReg());
68 DecodePSHUFHWMask(MI->getOperand(MI->getNumOperands()-1).getImm(),
72 Src1Name = getRegName(MI->getOperand(1).getReg());
75 DestName = getRegName(MI->getOperand(0).getReg());
76 DecodePSHUFLWMask(MI->getOperand(MI->getNumOperands()-1).getImm(),
80 case X86::PUNPCKHBWrr:
81 Src2Name = getRegName(MI->getOperand(2).getReg());
83 case X86::PUNPCKHBWrm:
84 Src1Name = getRegName(MI->getOperand(0).getReg());
85 DecodePUNPCKHMask(16, ShuffleMask);
87 case X86::PUNPCKHWDrr:
88 Src2Name = getRegName(MI->getOperand(2).getReg());
90 case X86::PUNPCKHWDrm:
91 Src1Name = getRegName(MI->getOperand(0).getReg());
92 DecodePUNPCKHMask(8, ShuffleMask);
94 case X86::PUNPCKHDQrr:
95 Src2Name = getRegName(MI->getOperand(2).getReg());
97 case X86::PUNPCKHDQrm:
98 Src1Name = getRegName(MI->getOperand(0).getReg());
99 DecodePUNPCKHMask(4, ShuffleMask);
101 case X86::PUNPCKHQDQrr:
102 Src2Name = getRegName(MI->getOperand(2).getReg());
104 case X86::PUNPCKHQDQrm:
105 Src1Name = getRegName(MI->getOperand(0).getReg());
106 DecodePUNPCKHMask(2, ShuffleMask);
109 case X86::PUNPCKLBWrr:
110 Src2Name = getRegName(MI->getOperand(2).getReg());
112 case X86::PUNPCKLBWrm:
113 Src1Name = getRegName(MI->getOperand(0).getReg());
114 DecodePUNPCKLMask(16, ShuffleMask);
116 case X86::PUNPCKLWDrr:
117 Src2Name = getRegName(MI->getOperand(2).getReg());
119 case X86::PUNPCKLWDrm:
120 Src1Name = getRegName(MI->getOperand(0).getReg());
121 DecodePUNPCKLMask(8, ShuffleMask);
123 case X86::PUNPCKLDQrr:
124 Src2Name = getRegName(MI->getOperand(2).getReg());
126 case X86::PUNPCKLDQrm:
127 Src1Name = getRegName(MI->getOperand(0).getReg());
128 DecodePUNPCKLMask(4, ShuffleMask);
130 case X86::PUNPCKLQDQrr:
131 Src2Name = getRegName(MI->getOperand(2).getReg());
133 case X86::PUNPCKLQDQrm:
134 Src1Name = getRegName(MI->getOperand(0).getReg());
135 DecodePUNPCKLMask(2, ShuffleMask);
139 DecodeSHUFPSMask(2, MI->getOperand(3).getImm(), ShuffleMask);
140 Src1Name = getRegName(MI->getOperand(0).getReg());
141 Src2Name = getRegName(MI->getOperand(2).getReg());
145 Src2Name = getRegName(MI->getOperand(2).getReg());
148 DecodeSHUFPSMask(4, MI->getOperand(3).getImm(), ShuffleMask);
149 Src1Name = getRegName(MI->getOperand(0).getReg());
152 case X86::UNPCKLPDrr:
153 Src2Name = getRegName(MI->getOperand(2).getReg());
155 case X86::UNPCKLPDrm:
156 DecodeUNPCKLPMask(2, ShuffleMask);
157 Src1Name = getRegName(MI->getOperand(0).getReg());
159 case X86::UNPCKLPSrr:
160 Src2Name = getRegName(MI->getOperand(2).getReg());
162 case X86::UNPCKLPSrm:
163 DecodeUNPCKLPMask(4, ShuffleMask);
164 Src1Name = getRegName(MI->getOperand(0).getReg());
166 case X86::UNPCKHPDrr:
167 Src2Name = getRegName(MI->getOperand(2).getReg());
169 case X86::UNPCKHPDrm:
170 DecodeUNPCKHPMask(2, ShuffleMask);
171 Src1Name = getRegName(MI->getOperand(0).getReg());
173 case X86::UNPCKHPSrr:
174 Src2Name = getRegName(MI->getOperand(2).getReg());
176 case X86::UNPCKHPSrm:
177 DecodeUNPCKHPMask(4, ShuffleMask);
178 Src1Name = getRegName(MI->getOperand(0).getReg());
183 // If this was a shuffle operation, print the shuffle mask.
184 if (!ShuffleMask.empty()) {
185 if (DestName == 0) DestName = Src1Name;
186 OS << (DestName ? DestName : "mem") << " = ";
188 // If the two sources are the same, canonicalize the input elements to be
189 // from the first src so that we get larger element spans.
190 if (Src1Name == Src2Name) {
191 for (unsigned i = 0, e = ShuffleMask.size(); i != e; ++i) {
192 if ((int)ShuffleMask[i] >= 0 && // Not sentinel.
193 ShuffleMask[i] >= e) // From second mask.
198 // The shuffle mask specifies which elements of the src1/src2 fill in the
199 // destination, with a few sentinel values. Loop through and print them
201 for (unsigned i = 0, e = ShuffleMask.size(); i != e; ++i) {
204 if (ShuffleMask[i] == SM_SentinelZero) {
209 // Otherwise, it must come from src1 or src2. Print the span of elements
210 // that comes from this src.
211 bool isSrc1 = ShuffleMask[i] < ShuffleMask.size();
212 const char *SrcName = isSrc1 ? Src1Name : Src2Name;
213 OS << (SrcName ? SrcName : "mem") << '[';
216 (int)ShuffleMask[i] >= 0 &&
217 (ShuffleMask[i] < ShuffleMask.size()) == isSrc1) {
222 OS << ShuffleMask[i] % ShuffleMask.size();
226 --i; // For loop increments element #.