gcc/libgcc/config/picochip/clzsi2.S

// Copyright (C) 2008, 2011 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
//
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
//
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

// picoChip ASM file
//.file "clzsi2.S"

.section .text

.global __clzsi2
__clzsi2:
_picoMark_FUNCTION_BEGIN=

// picoChip Function Prologue : &__clzsi2 = 0 bytes

	// What value should be operated on? If the top word is empty
	// then count the bits in the bottom word, and add 16. If the
	// top word is not empty, then count the bits in the top word.

	// R4 stores the constant 0

	sub.0 R1,0,r15 \ copy.1 16,r2
	copyeq r0,r1
	copyne 0,r2

	// R1 now stores value to count, and R2 stores current bit offset.
	sbc r1,r0
	asr.0 r1,15,r15 \ add.1 r0,1,r0
	jr (lr) \ copyne 0,r0
=->	add.0 r0,r2,r0

_picoMark_FUNCTION_END=

// picoChip Function Epilogue : __clzsi2

//============================================================================
// All DWARF information between this marker, and the END OF DWARF
// marker should be included in the source file. Search for
// FUNCTION_STACK_SIZE_GOES_HERE and FUNCTION NAME GOES HERE, and
// provide the relevent information. Add markers called
// _picoMark_FUNCTION_BEGIN and _picoMark_FUNCTION_END around the
// function in question.
//============================================================================

//============================================================================
// Frame information. 
//============================================================================

.section .debug_frame
_picoMark_DebugFrame=

// Common CIE header.
.unalignedInitLong _picoMark_CieEnd-_picoMark_CieBegin
_picoMark_CieBegin=
.unalignedInitLong 0xffffffff
.initByte 0x1	// CIE Version
.ascii 16#0#	// CIE Augmentation
.uleb128 0x1	// CIE Code Alignment Factor
.sleb128 2	// CIE Data Alignment Factor
.initByte 0xc	// CIE RA Column
.initByte 0xc	// DW_CFA_def_cfa
.uleb128 0xd
.uleb128 0x0
.align 2
_picoMark_CieEnd=

// FDE 
_picoMark_LSFDE0I900821033007563=
.unalignedInitLong _picoMark_FdeEnd-_picoMark_FdeBegin
_picoMark_FdeBegin=
.unalignedInitLong _picoMark_DebugFrame	// FDE CIE offset
.unalignedInitWord _picoMark_FUNCTION_BEGIN	// FDE initial location
.unalignedInitWord _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
.initByte 0xe	// DW_CFA_def_cfa_offset
.uleb128 0x0	// <-- FUNCTION_STACK_SIZE_GOES_HERE
.initByte 0x4	// DW_CFA_advance_loc4
.unalignedInitLong _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
.initByte 0xe	// DW_CFA_def_cfa_offset
.uleb128 0x0
.align 2
_picoMark_FdeEnd=

//============================================================================
// Abbrevation information.
//============================================================================

.section .debug_abbrev
_picoMark_ABBREVIATIONS=

.section .debug_abbrev
	.uleb128 0x1	// (abbrev code)
	.uleb128 0x11	// (TAG: DW_TAG_compile_unit)
	.initByte 0x1	// DW_children_yes
	.uleb128 0x10	// (DW_AT_stmt_list)
	.uleb128 0x6	// (DW_FORM_data4)
	.uleb128 0x12	// (DW_AT_high_pc)
	.uleb128 0x1	// (DW_FORM_addr)
	.uleb128 0x11	// (DW_AT_low_pc)
	.uleb128 0x1	// (DW_FORM_addr)
	.uleb128 0x25	// (DW_AT_producer)
	.uleb128 0x8	// (DW_FORM_string)
	.uleb128 0x13	// (DW_AT_language)
	.uleb128 0x5	// (DW_FORM_data2)
	.uleb128 0x3	// (DW_AT_name)
	.uleb128 0x8	// (DW_FORM_string)
.initByte 0x0
.initByte 0x0

	.uleb128 0x2	;# (abbrev code)
	.uleb128 0x2e	;# (TAG: DW_TAG_subprogram)
.initByte 0x0	;# DW_children_no
	.uleb128 0x3	;# (DW_AT_name)
	.uleb128 0x8	;# (DW_FORM_string)
	.uleb128 0x11	;# (DW_AT_low_pc)
	.uleb128 0x1	;# (DW_FORM_addr)
	.uleb128 0x12	;# (DW_AT_high_pc)
	.uleb128 0x1	;# (DW_FORM_addr)
.initByte 0x0
.initByte 0x0

.initByte 0x0

//============================================================================
// Line information. DwarfLib requires this to be present, but it can
// be empty.
//============================================================================

.section .debug_line
_picoMark_LINES=

//============================================================================
// Debug Information
//============================================================================
.section .debug_info

//Fixed header.
.unalignedInitLong _picoMark_DEBUG_INFO_END-_picoMark_DEBUG_INFO_BEGIN
_picoMark_DEBUG_INFO_BEGIN=
.unalignedInitWord 0x2
.unalignedInitLong _picoMark_ABBREVIATIONS
.initByte 0x2

// Compile unit information.
.uleb128 0x1	// (DIE 0xb) DW_TAG_compile_unit)
.unalignedInitLong _picoMark_LINES
.unalignedInitWord _picoMark_FUNCTION_END
.unalignedInitWord _picoMark_FUNCTION_BEGIN
// Producer is `picoChip'
.ascii 16#70# 16#69# 16#63# 16#6f# 16#43# 16#68# 16#69# 16#70# 16#00#
.unalignedInitWord 0xcafe // ASM language
.ascii 16#0# // Name. DwarfLib expects this to be present.

.uleb128 0x2	;# (DIE DW_TAG_subprogram)

// FUNCTION NAME GOES HERE. Use `echo name | od -t x1' to get the hex. Each hex
// digit is specified using the format 16#XX#
.ascii 16#5F# 16#63# 16#6C# 16#7A# 16#73# 16#69# 16#32# 16#0# // Function name `_clzsi2'
.unalignedInitWord _picoMark_FUNCTION_BEGIN	// DW_AT_low_pc
.unalignedInitWord _picoMark_FUNCTION_END	// DW_AT_high_pc

.initByte 0x0	// end of compile unit children.

_picoMark_DEBUG_INFO_END=

//============================================================================
// END OF DWARF
//============================================================================

.section .endFile
// End of picoChip ASM file