diff options
Diffstat (limited to 'libgcc/config/picochip/udivmodhi4.S')
| -rw-r--r-- | libgcc/config/picochip/udivmodhi4.S | 238 |
1 files changed, 0 insertions, 238 deletions
diff --git a/libgcc/config/picochip/udivmodhi4.S b/libgcc/config/picochip/udivmodhi4.S deleted file mode 100644 index 920eb375af2..00000000000 --- a/libgcc/config/picochip/udivmodhi4.S +++ /dev/null @@ -1,238 +0,0 @@ -// picoChip ASM file -// -// Support for 16-bit unsigned division/modulus. -// -// Copyright (C) 2003-2014 Free Software Foundation, Inc. -// Contributed by Picochip Ltd. -// Maintained by Daniel Towner (daniel.towner@picochip.com) -// -// This file 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. -// -// This file 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/>. - -.section .text - -.global __udivmodhi4 -__udivmodhi4: -_picoMark_FUNCTION_BEGIN= - -// picoChip Function Prologue : &__udivmodhi4 = 6 bytes - - // 16-bit unsigned division. The divstep function is only capable of - // handling 15-bit division (plus a sign to give 16-bits). It is not - // capable of handling unsigned division directly. Instead, take - // advantage of the special property that - // ((divisor / 2) / dividend) * 2 will be almost good enough. The - // error in the result is only 0 or 1, and this can be easily - // tested and corrected. A full description of the algorithm can - // be found in `Hacker's Delight', by Henry Warren, page 146. - - // Input: - // r0 - dividend - // r1 - divisor - // Output: - // r0 - quotient - // r1 - remainder - - // Note that the lr, and original inputs are speculatively saved. They - // will only be restored if the 15-bit division function is called. - - sub.0 r1,0,r15 \ stl r[0:1],(fp)-1 - bge divisorIs15bit -=-> sub.0 r0,r1,r2 \ stw lr,(fp)-3 - - // The divisor is >= 2^15. - bhs quotientIs1 - - // The dividend < divisor. The quotient is thus 0, and the - // remainder is the dividend. - copy.0 r0,r1 \ jr (lr) -=-> copy.0 0,r0 - -quotientIs1: - // The dividend >= divisor. The quotient is thus 1, and the - // remainder can be computed directly by subtraction (i.e., the - // result of the comparison already performed to branch here). - jr (lr) \ copy.0 r2,r1 -=-> copy.0 1,r0 - -divisorIs15bit: - // The divisor is < 2^15. - - // Divide the original dividend by 2, and call the 15-bit division. - // Note that the original dividend is stored in r5, which is - // known to be unused by the called function, so that - // a memory stall isn't introduced immediately after the - // function returns, to reload this value from memory. - - jl (&__divmod15) \ copy.0 r0,r5 // fn_call &__divmod15 -=-> lsr.0 r0,1,r0 - - // Compute the new quotient and remainder by multiplying them by 2. - // The remainder will be 1 out, if the original dividend was odd. - and.0 r5,1,r5 \ ldl (fp)-1,r[2:3] - add.0 [lsl r1,1],r5,r1 \ lsl.1 r0,1,r0 - - // The error in the quotient is 0 or 1. The error can be determined - // by comparing the remainder to the original divisor. If the - // remainder is bigger, then an error of 1 has been introduced. - sub.0 r1,r3,r15 \ ldw (fp)-3,lr - blo noCompensation -=-> nop - add.0 r0,1,r0 \ sub.1 r1,r3,r1 -noCompensation: - jr (lr) - -_picoMark_FUNCTION_END= -// picoChip Function Epilogue : udivmodhi4 - - -//============================================================================ -// 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 relevant 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 0x6 // <-- 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#75# 16#64# 16#69# 16#76# 16#6d# 16#6f# 16#64# 16#68# 16#69# 16#34# 16#0# // Function name `_udivmodhi4' -.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 |