2 //.file "popcounthi2.S"
4 // Support for 16-bit population count.
6 // Copyright (C) 2003, 2004, 2005, 2008, 2009 Free Software Foundation, Inc.
7 // Contributed by Picochip Ltd.
8 // Maintained by Daniel Towner (daniel.towner@picochip.com)
10 // This file is free software; you can redistribute it and/or modify it
11 // under the terms of the GNU General Public License as published by the
12 // Free Software Foundation; either version 3, or (at your option) any
15 // This file is distributed in the hope that it will be useful, but
16 // WITHOUT ANY WARRANTY; without even the implied warranty of
17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 // General Public License for more details.
20 // Under Section 7 of GPL version 3, you are granted additional
21 // permissions described in the GCC Runtime Library Exception, version
22 // 3.1, as published by the Free Software Foundation.
24 // You should have received a copy of the GNU General Public License and
25 // a copy of the GCC Runtime Library Exception along with this program;
26 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
27 // <http://www.gnu.org/licenses/>.
31 // The following code (taken from a newsgroup posting) was compiled, and then
32 // hand assembled (a similar version is given in the Hacker's Delight
36 // popcount (int value)
38 // value = ((value & 0xAAAA) >> 1) + (value & 0x5555);
39 // value = ((value & 0xCCCC) >> 2) + (value & 0x3333);
40 // value = ((value & 0xF0F0) >> 4) + (value & 0x0F0F);
41 // return ((value & 0xFF00) >> 8) + (value & 0x00FF);
44 // This assembly function is approx. 20x faster than a naive loop
45 // implementation of the population count, but about 30% bigger
46 // (45 bytes v. 34 bytes).
49 .global ___popcounthi2
52 _picoMark_FUNCTION_BEGIN=
54 // picoChip Function Prologue : &___popcounthi2 = 0 bytes
56 AND.0 [LSR R0,1],21845,R0 \ AND.1 R0,21845,R5
58 AND.0 [LSR R0,2],13107,R0 \ AND.1 R0,13107,R5
59 ADD.0 R0,R5,R0 \ COPY.1 1807,R2
60 AND.0 [LSR R0,4],R2,R0 \ AND.1 R0,3855,R5
62 JR (R12) \ AND.0 R0, 255, R5
63 =-> ADD.0 [LSR R0,8],R5,R0
65 _picoMark_FUNCTION_END=
66 // picoChip Function Epilogue : ___popcounthi2
67 //============================================================================
68 // All DWARF information between this marker, and the END OF DWARF
69 // marker should be included in the source file. Search for
70 // FUNCTION_STACK_SIZE_GOES_HERE and FUNCTION NAME GOES HERE, and
71 // provide the relevant information. Add markers called
72 // _picoMark_FUNCTION_BEGIN and _picoMark_FUNCTION_END around the
73 // function in question.
74 //============================================================================
76 //============================================================================
78 //============================================================================
84 .unalignedInitLong _picoMark_CieEnd-_picoMark_CieBegin
86 .unalignedInitLong 0xffffffff
87 .initByte 0x1 // CIE Version
88 .ascii 16#0# // CIE Augmentation
89 .uleb128 0x1 // CIE Code Alignment Factor
90 .sleb128 2 // CIE Data Alignment Factor
91 .initByte 0xc // CIE RA Column
92 .initByte 0xc // DW_CFA_def_cfa
99 _picoMark_LSFDE0I900821033007563=
100 .unalignedInitLong _picoMark_FdeEnd-_picoMark_FdeBegin
102 .unalignedInitLong _picoMark_DebugFrame // FDE CIE offset
103 .unalignedInitWord _picoMark_FUNCTION_BEGIN // FDE initial location
104 .unalignedInitWord _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
105 .initByte 0xe // DW_CFA_def_cfa_offset
106 .uleb128 0x0 // <-- FUNCTION_STACK_SIZE_GOES_HERE
107 .initByte 0x4 // DW_CFA_advance_loc4
108 .unalignedInitLong _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
109 .initByte 0xe // DW_CFA_def_cfa_offset
114 //============================================================================
115 // Abbrevation information.
116 //============================================================================
118 .section .debug_abbrev
119 _picoMark_ABBREVIATIONS=
121 .section .debug_abbrev
122 .uleb128 0x1 // (abbrev code)
123 .uleb128 0x11 // (TAG: DW_TAG_compile_unit)
124 .initByte 0x1 // DW_children_yes
125 .uleb128 0x10 // (DW_AT_stmt_list)
126 .uleb128 0x6 // (DW_FORM_data4)
127 .uleb128 0x12 // (DW_AT_high_pc)
128 .uleb128 0x1 // (DW_FORM_addr)
129 .uleb128 0x11 // (DW_AT_low_pc)
130 .uleb128 0x1 // (DW_FORM_addr)
131 .uleb128 0x25 // (DW_AT_producer)
132 .uleb128 0x8 // (DW_FORM_string)
133 .uleb128 0x13 // (DW_AT_language)
134 .uleb128 0x5 // (DW_FORM_data2)
135 .uleb128 0x3 // (DW_AT_name)
136 .uleb128 0x8 // (DW_FORM_string)
140 .uleb128 0x2 ;# (abbrev code)
141 .uleb128 0x2e ;# (TAG: DW_TAG_subprogram)
142 .initByte 0x0 ;# DW_children_no
143 .uleb128 0x3 ;# (DW_AT_name)
144 .uleb128 0x8 ;# (DW_FORM_string)
145 .uleb128 0x11 ;# (DW_AT_low_pc)
146 .uleb128 0x1 ;# (DW_FORM_addr)
147 .uleb128 0x12 ;# (DW_AT_high_pc)
148 .uleb128 0x1 ;# (DW_FORM_addr)
154 //============================================================================
155 // Line information. DwarfLib requires this to be present, but it can
157 //============================================================================
162 //============================================================================
164 //============================================================================
168 .unalignedInitLong _picoMark_DEBUG_INFO_END-_picoMark_DEBUG_INFO_BEGIN
169 _picoMark_DEBUG_INFO_BEGIN=
170 .unalignedInitWord 0x2
171 .unalignedInitLong _picoMark_ABBREVIATIONS
174 // Compile unit information.
175 .uleb128 0x1 // (DIE 0xb) DW_TAG_compile_unit)
176 .unalignedInitLong _picoMark_LINES
177 .unalignedInitWord _picoMark_FUNCTION_END
178 .unalignedInitWord _picoMark_FUNCTION_BEGIN
179 // Producer is `picoChip'
180 .ascii 16#70# 16#69# 16#63# 16#6f# 16#43# 16#68# 16#69# 16#70# 16#00#
181 .unalignedInitWord 0xcafe // ASM language
182 .ascii 16#0# // Name. DwarfLib expects this to be present.
184 .uleb128 0x2 ;# (DIE DW_TAG_subprogram)
186 // FUNCTION NAME GOES HERE. Use `echo name | od -t x1' to get the hex. Each hex
187 // digit is specified using the format 16#XX#
188 .ascii 16#5f# 16#5f# 16#70# 16#6f# 16#70# 16#63# 16#6f# 16#75# 16#6e# 16#74# 16#68# 16#69# 16#32# 16#0# // Function name `__popcounthi2'
189 .unalignedInitWord _picoMark_FUNCTION_BEGIN // DW_AT_low_pc
190 .unalignedInitWord _picoMark_FUNCTION_END // DW_AT_high_pc
192 .initByte 0x0 // end of compile unit children.
194 _picoMark_DEBUG_INFO_END=
196 //============================================================================
198 //============================================================================
201 // End of picoChip ASM file