Gitiles
Code Review Sign In
gerrit-public.fairphone.software / toolchain / llvm-project / 3cb61634ff3795ef65b1f618d3809053b6a0a515 / . / llvm / lib / Target / X86 / X86MacroFusion.cpp
blob: 8fdf10617059a6ec1e5b3c0f06394260c37bf2e8 [file] [log] [blame]
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]1//===- X86MacroFusion.cpp - X86 Macro Fusion ------------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Florian Hahn5f746c82017-06-19 12:53:31 +0000[diff] [blame]5// This file is distributed under the University of Illinois Open Source
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
Florian Hahn5f746c82017-06-19 12:53:31 +0000[diff] [blame]10/// \file This file contains the X86 implementation of the DAG scheduling
11/// mutation to pair instructions back to back.
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]12//
13//===----------------------------------------------------------------------===//
14
15#include "X86MacroFusion.h"
16#include "X86Subtarget.h"
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]17#include "llvm/Target/TargetInstrInfo.h"
Florian Hahn5f746c82017-06-19 12:53:31 +0000[diff] [blame]18#include "llvm/CodeGen/MacroFusion.h"
Evandro Menezesa8d33012017-02-21 22:16:13 +0000[diff] [blame]19
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]20using namespace llvm;
21
Florian Hahn5f746c82017-06-19 12:53:31 +0000[diff] [blame]22/// \brief Check if the instr pair, FirstMI and SecondMI, should be fused
23/// together. Given SecondMI, when FirstMI is unspecified, then check if
24/// SecondMI may be part of a fused pair at all.
25static bool shouldScheduleAdjacent(const TargetInstrInfo &TII,
26 const TargetSubtargetInfo &TSI,
27 const MachineInstr *FirstMI,
28 const MachineInstr &SecondMI) {
29 const X86Subtarget &ST = static_cast<const X86Subtarget&>(TSI);
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]30 // Check if this processor supports macro-fusion. Since this is a minor
31 // heuristic, we haven't specifically reserved a feature. hasAVX is a decent
32 // proxy for SandyBridge+.
33 if (!ST.hasAVX())
34 return false;
35
36 enum {
37 FuseTest,
38 FuseCmp,
39 FuseInc
40 } FuseKind;
41
Florian Hahn5f746c82017-06-19 12:53:31 +0000[diff] [blame]42 unsigned FirstOpcode = FirstMI
43 ? FirstMI->getOpcode()
Evandro Menezesb9b7f4b2017-02-21 22:16:11 +0000[diff] [blame]44 : static_cast<unsigned>(X86::INSTRUCTION_LIST_END);
Florian Hahn5f746c82017-06-19 12:53:31 +0000[diff] [blame]45 unsigned SecondOpcode = SecondMI.getOpcode();
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]46
47 switch (SecondOpcode) {
48 default:
49 return false;
50 case X86::JE_1:
51 case X86::JNE_1:
52 case X86::JL_1:
53 case X86::JLE_1:
54 case X86::JG_1:
55 case X86::JGE_1:
56 FuseKind = FuseInc;
57 break;
58 case X86::JB_1:
59 case X86::JBE_1:
60 case X86::JA_1:
61 case X86::JAE_1:
62 FuseKind = FuseCmp;
63 break;
64 case X86::JS_1:
65 case X86::JNS_1:
66 case X86::JP_1:
67 case X86::JNP_1:
68 case X86::JO_1:
69 case X86::JNO_1:
70 FuseKind = FuseTest;
71 break;
72 }
73
74 switch (FirstOpcode) {
75 default:
76 return false;
77 case X86::TEST8rr:
78 case X86::TEST16rr:
79 case X86::TEST32rr:
80 case X86::TEST64rr:
81 case X86::TEST8ri:
82 case X86::TEST16ri:
83 case X86::TEST32ri:
84 case X86::TEST32i32:
85 case X86::TEST64i32:
86 case X86::TEST64ri32:
87 case X86::TEST8rm:
88 case X86::TEST16rm:
89 case X86::TEST32rm:
90 case X86::TEST64rm:
91 case X86::TEST8ri_NOREX:
92 case X86::AND16i16:
93 case X86::AND16ri:
94 case X86::AND16ri8:
95 case X86::AND16rm:
96 case X86::AND16rr:
97 case X86::AND32i32:
98 case X86::AND32ri:
99 case X86::AND32ri8:
100 case X86::AND32rm:
101 case X86::AND32rr:
102 case X86::AND64i32:
103 case X86::AND64ri32:
104 case X86::AND64ri8:
105 case X86::AND64rm:
106 case X86::AND64rr:
107 case X86::AND8i8:
108 case X86::AND8ri:
109 case X86::AND8rm:
110 case X86::AND8rr:
111 return true;
112 case X86::CMP16i16:
113 case X86::CMP16ri:
114 case X86::CMP16ri8:
115 case X86::CMP16rm:
116 case X86::CMP16rr:
117 case X86::CMP32i32:
118 case X86::CMP32ri:
119 case X86::CMP32ri8:
120 case X86::CMP32rm:
121 case X86::CMP32rr:
122 case X86::CMP64i32:
123 case X86::CMP64ri32:
124 case X86::CMP64ri8:
125 case X86::CMP64rm:
126 case X86::CMP64rr:
127 case X86::CMP8i8:
128 case X86::CMP8ri:
129 case X86::CMP8rm:
130 case X86::CMP8rr:
131 case X86::ADD16i16:
132 case X86::ADD16ri:
133 case X86::ADD16ri8:
134 case X86::ADD16ri8_DB:
135 case X86::ADD16ri_DB:
136 case X86::ADD16rm:
137 case X86::ADD16rr:
138 case X86::ADD16rr_DB:
139 case X86::ADD32i32:
140 case X86::ADD32ri:
141 case X86::ADD32ri8:
142 case X86::ADD32ri8_DB:
143 case X86::ADD32ri_DB:
144 case X86::ADD32rm:
145 case X86::ADD32rr:
146 case X86::ADD32rr_DB:
147 case X86::ADD64i32:
148 case X86::ADD64ri32:
149 case X86::ADD64ri32_DB:
150 case X86::ADD64ri8:
151 case X86::ADD64ri8_DB:
152 case X86::ADD64rm:
153 case X86::ADD64rr:
154 case X86::ADD64rr_DB:
155 case X86::ADD8i8:
156 case X86::ADD8mi:
157 case X86::ADD8mr:
158 case X86::ADD8ri:
159 case X86::ADD8rm:
160 case X86::ADD8rr:
161 case X86::SUB16i16:
162 case X86::SUB16ri:
163 case X86::SUB16ri8:
164 case X86::SUB16rm:
165 case X86::SUB16rr:
166 case X86::SUB32i32:
167 case X86::SUB32ri:
168 case X86::SUB32ri8:
169 case X86::SUB32rm:
170 case X86::SUB32rr:
171 case X86::SUB64i32:
172 case X86::SUB64ri32:
173 case X86::SUB64ri8:
174 case X86::SUB64rm:
175 case X86::SUB64rr:
176 case X86::SUB8i8:
177 case X86::SUB8ri:
178 case X86::SUB8rm:
179 case X86::SUB8rr:
180 return FuseKind == FuseCmp || FuseKind == FuseInc;
181 case X86::INC16r:
182 case X86::INC32r:
183 case X86::INC64r:
184 case X86::INC8r:
185 case X86::DEC16r:
186 case X86::DEC32r:
187 case X86::DEC64r:
188 case X86::DEC8r:
189 return FuseKind == FuseInc;
190 case X86::INSTRUCTION_LIST_END:
191 return true;
192 }
193}
194
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]195namespace llvm {
196
197std::unique_ptr<ScheduleDAGMutation>
198createX86MacroFusionDAGMutation () {
Florian Hahn5f746c82017-06-19 12:53:31 +0000[diff] [blame]199 return createBranchMacroFusionDAGMutation(shouldScheduleAdjacent);
Evandro Menezes94edf022017-02-01 02:54:34 +0000[diff] [blame]200}
201
202} // end namespace llvm