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| /* SPDX-License-Identifier: GPL-2.0+ WITH GCC-exception-2.0
|
| Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
| 2004, 2005, 2006
| Free Software Foundation, Inc.
| */
|
| !! libgcc routines for the Renesas / SuperH SH CPUs.
| !! Contributed by Steve Chamberlain.
| !! sac@cygnus.com
|
| !! ashiftrt_r4_x, ___ashrsi3, ___ashlsi3, ___lshrsi3 routines
| !! recoded in assembly by Toshiyasu Morita
| !! tm@netcom.com
|
| /* SH2 optimizations for ___ashrsi3, ___ashlsi3, ___lshrsi3 and
| ELF local label prefixes by J"orn Rennecke
| amylaar@cygnus.com */
|
| /* This code used shld, thus is not suitable for SH1 / SH2. */
|
| /* Signed / unsigned division without use of FPU, optimized for SH4.
| Uses a lookup table for divisors in the range -128 .. +128, and
| div1 with case distinction for larger divisors in three more ranges.
| The code is lumped together with the table to allow the use of mova. */
| #ifdef CONFIG_CPU_LITTLE_ENDIAN
| #define L_LSB 0
| #define L_LSWMSB 1
| #define L_MSWLSB 2
| #else
| #define L_LSB 3
| #define L_LSWMSB 2
| #define L_MSWLSB 1
| #endif
|
| .balign 4
| .global __udivsi3_i4i
| .global __udivsi3_i4
| .set __udivsi3_i4, __udivsi3_i4i
| .type __udivsi3_i4i, @function
| __udivsi3_i4i:
| mov.w c128_w, r1
| div0u
| mov r4,r0
| shlr8 r0
| cmp/hi r1,r5
| extu.w r5,r1
| bf udiv_le128
| cmp/eq r5,r1
| bf udiv_ge64k
| shlr r0
| mov r5,r1
| shll16 r5
| mov.l r4,@-r15
| div1 r5,r0
| mov.l r1,@-r15
| div1 r5,r0
| div1 r5,r0
| bra udiv_25
| div1 r5,r0
|
| div_le128:
| mova div_table_ix,r0
| bra div_le128_2
| mov.b @(r0,r5),r1
| udiv_le128:
| mov.l r4,@-r15
| mova div_table_ix,r0
| mov.b @(r0,r5),r1
| mov.l r5,@-r15
| div_le128_2:
| mova div_table_inv,r0
| mov.l @(r0,r1),r1
| mov r5,r0
| tst #0xfe,r0
| mova div_table_clz,r0
| dmulu.l r1,r4
| mov.b @(r0,r5),r1
| bt/s div_by_1
| mov r4,r0
| mov.l @r15+,r5
| sts mach,r0
| /* clrt */
| addc r4,r0
| mov.l @r15+,r4
| rotcr r0
| rts
| shld r1,r0
|
| div_by_1_neg:
| neg r4,r0
| div_by_1:
| mov.l @r15+,r5
| rts
| mov.l @r15+,r4
|
| div_ge64k:
| bt/s div_r8
| div0u
| shll8 r5
| bra div_ge64k_2
| div1 r5,r0
| udiv_ge64k:
| cmp/hi r0,r5
| mov r5,r1
| bt udiv_r8
| shll8 r5
| mov.l r4,@-r15
| div1 r5,r0
| mov.l r1,@-r15
| div_ge64k_2:
| div1 r5,r0
| mov.l zero_l,r1
| .rept 4
| div1 r5,r0
| .endr
| mov.l r1,@-r15
| div1 r5,r0
| mov.w m256_w,r1
| div1 r5,r0
| mov.b r0,@(L_LSWMSB,r15)
| xor r4,r0
| and r1,r0
| bra div_ge64k_end
| xor r4,r0
|
| div_r8:
| shll16 r4
| bra div_r8_2
| shll8 r4
| udiv_r8:
| mov.l r4,@-r15
| shll16 r4
| clrt
| shll8 r4
| mov.l r5,@-r15
| div_r8_2:
| rotcl r4
| mov r0,r1
| div1 r5,r1
| mov r4,r0
| rotcl r0
| mov r5,r4
| div1 r5,r1
| .rept 5
| rotcl r0; div1 r5,r1
| .endr
| rotcl r0
| mov.l @r15+,r5
| div1 r4,r1
| mov.l @r15+,r4
| rts
| rotcl r0
|
| .global __sdivsi3_i4i
| .global __sdivsi3_i4
| .global __sdivsi3
| .set __sdivsi3_i4, __sdivsi3_i4i
| .set __sdivsi3, __sdivsi3_i4i
| .type __sdivsi3_i4i, @function
| /* This is link-compatible with a __sdivsi3 call,
| but we effectively clobber only r1. */
| __sdivsi3_i4i:
| mov.l r4,@-r15
| cmp/pz r5
| mov.w c128_w, r1
| bt/s pos_divisor
| cmp/pz r4
| mov.l r5,@-r15
| neg r5,r5
| bt/s neg_result
| cmp/hi r1,r5
| neg r4,r4
| pos_result:
| extu.w r5,r0
| bf div_le128
| cmp/eq r5,r0
| mov r4,r0
| shlr8 r0
| bf/s div_ge64k
| cmp/hi r0,r5
| div0u
| shll16 r5
| div1 r5,r0
| div1 r5,r0
| div1 r5,r0
| udiv_25:
| mov.l zero_l,r1
| div1 r5,r0
| div1 r5,r0
| mov.l r1,@-r15
| .rept 3
| div1 r5,r0
| .endr
| mov.b r0,@(L_MSWLSB,r15)
| xtrct r4,r0
| swap.w r0,r0
| .rept 8
| div1 r5,r0
| .endr
| mov.b r0,@(L_LSWMSB,r15)
| div_ge64k_end:
| .rept 8
| div1 r5,r0
| .endr
| mov.l @r15+,r4 ! zero-extension and swap using LS unit.
| extu.b r0,r0
| mov.l @r15+,r5
| or r4,r0
| mov.l @r15+,r4
| rts
| rotcl r0
|
| div_le128_neg:
| tst #0xfe,r0
| mova div_table_ix,r0
| mov.b @(r0,r5),r1
| mova div_table_inv,r0
| bt/s div_by_1_neg
| mov.l @(r0,r1),r1
| mova div_table_clz,r0
| dmulu.l r1,r4
| mov.b @(r0,r5),r1
| mov.l @r15+,r5
| sts mach,r0
| /* clrt */
| addc r4,r0
| mov.l @r15+,r4
| rotcr r0
| shld r1,r0
| rts
| neg r0,r0
|
| pos_divisor:
| mov.l r5,@-r15
| bt/s pos_result
| cmp/hi r1,r5
| neg r4,r4
| neg_result:
| extu.w r5,r0
| bf div_le128_neg
| cmp/eq r5,r0
| mov r4,r0
| shlr8 r0
| bf/s div_ge64k_neg
| cmp/hi r0,r5
| div0u
| mov.l zero_l,r1
| shll16 r5
| div1 r5,r0
| mov.l r1,@-r15
| .rept 7
| div1 r5,r0
| .endr
| mov.b r0,@(L_MSWLSB,r15)
| xtrct r4,r0
| swap.w r0,r0
| .rept 8
| div1 r5,r0
| .endr
| mov.b r0,@(L_LSWMSB,r15)
| div_ge64k_neg_end:
| .rept 8
| div1 r5,r0
| .endr
| mov.l @r15+,r4 ! zero-extension and swap using LS unit.
| extu.b r0,r1
| mov.l @r15+,r5
| or r4,r1
| div_r8_neg_end:
| mov.l @r15+,r4
| rotcl r1
| rts
| neg r1,r0
|
| div_ge64k_neg:
| bt/s div_r8_neg
| div0u
| shll8 r5
| mov.l zero_l,r1
| .rept 6
| div1 r5,r0
| .endr
| mov.l r1,@-r15
| div1 r5,r0
| mov.w m256_w,r1
| div1 r5,r0
| mov.b r0,@(L_LSWMSB,r15)
| xor r4,r0
| and r1,r0
| bra div_ge64k_neg_end
| xor r4,r0
|
| c128_w:
| .word 128
|
| div_r8_neg:
| clrt
| shll16 r4
| mov r4,r1
| shll8 r1
| mov r5,r4
| .rept 7
| rotcl r1; div1 r5,r0
| .endr
| mov.l @r15+,r5
| rotcl r1
| bra div_r8_neg_end
| div1 r4,r0
|
| m256_w:
| .word 0xff00
| /* This table has been generated by divtab-sh4.c. */
| .balign 4
| div_table_clz:
| .byte 0
| .byte 1
| .byte 0
| .byte -1
| .byte -1
| .byte -2
| .byte -2
| .byte -2
| .byte -2
| .byte -3
| .byte -3
| .byte -3
| .byte -3
| .byte -3
| .byte -3
| .byte -3
| .byte -3
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -4
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -5
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| .byte -6
| /* Lookup table translating positive divisor to index into table of
| normalized inverse. N.B. the '0' entry is also the last entry of the
| previous table, and causes an unaligned access for division by zero. */
| div_table_ix:
| .byte -6
| .byte -128
| .byte -128
| .byte 0
| .byte -128
| .byte -64
| .byte 0
| .byte 64
| .byte -128
| .byte -96
| .byte -64
| .byte -32
| .byte 0
| .byte 32
| .byte 64
| .byte 96
| .byte -128
| .byte -112
| .byte -96
| .byte -80
| .byte -64
| .byte -48
| .byte -32
| .byte -16
| .byte 0
| .byte 16
| .byte 32
| .byte 48
| .byte 64
| .byte 80
| .byte 96
| .byte 112
| .byte -128
| .byte -120
| .byte -112
| .byte -104
| .byte -96
| .byte -88
| .byte -80
| .byte -72
| .byte -64
| .byte -56
| .byte -48
| .byte -40
| .byte -32
| .byte -24
| .byte -16
| .byte -8
| .byte 0
| .byte 8
| .byte 16
| .byte 24
| .byte 32
| .byte 40
| .byte 48
| .byte 56
| .byte 64
| .byte 72
| .byte 80
| .byte 88
| .byte 96
| .byte 104
| .byte 112
| .byte 120
| .byte -128
| .byte -124
| .byte -120
| .byte -116
| .byte -112
| .byte -108
| .byte -104
| .byte -100
| .byte -96
| .byte -92
| .byte -88
| .byte -84
| .byte -80
| .byte -76
| .byte -72
| .byte -68
| .byte -64
| .byte -60
| .byte -56
| .byte -52
| .byte -48
| .byte -44
| .byte -40
| .byte -36
| .byte -32
| .byte -28
| .byte -24
| .byte -20
| .byte -16
| .byte -12
| .byte -8
| .byte -4
| .byte 0
| .byte 4
| .byte 8
| .byte 12
| .byte 16
| .byte 20
| .byte 24
| .byte 28
| .byte 32
| .byte 36
| .byte 40
| .byte 44
| .byte 48
| .byte 52
| .byte 56
| .byte 60
| .byte 64
| .byte 68
| .byte 72
| .byte 76
| .byte 80
| .byte 84
| .byte 88
| .byte 92
| .byte 96
| .byte 100
| .byte 104
| .byte 108
| .byte 112
| .byte 116
| .byte 120
| .byte 124
| .byte -128
| /* 1/64 .. 1/127, normalized. There is an implicit leading 1 in bit 32. */
| .balign 4
| zero_l:
| .long 0x0
| .long 0xF81F81F9
| .long 0xF07C1F08
| .long 0xE9131AC0
| .long 0xE1E1E1E2
| .long 0xDAE6076C
| .long 0xD41D41D5
| .long 0xCD856891
| .long 0xC71C71C8
| .long 0xC0E07039
| .long 0xBACF914D
| .long 0xB4E81B4F
| .long 0xAF286BCB
| .long 0xA98EF607
| .long 0xA41A41A5
| .long 0x9EC8E952
| .long 0x9999999A
| .long 0x948B0FCE
| .long 0x8F9C18FA
| .long 0x8ACB90F7
| .long 0x86186187
| .long 0x81818182
| .long 0x7D05F418
| .long 0x78A4C818
| .long 0x745D1746
| .long 0x702E05C1
| .long 0x6C16C16D
| .long 0x68168169
| .long 0x642C8591
| .long 0x60581606
| .long 0x5C9882BA
| .long 0x58ED2309
| div_table_inv:
| .long 0x55555556
| .long 0x51D07EAF
| .long 0x4E5E0A73
| .long 0x4AFD6A06
| .long 0x47AE147B
| .long 0x446F8657
| .long 0x41414142
| .long 0x3E22CBCF
| .long 0x3B13B13C
| .long 0x38138139
| .long 0x3521CFB3
| .long 0x323E34A3
| .long 0x2F684BDB
| .long 0x2C9FB4D9
| .long 0x29E4129F
| .long 0x27350B89
| .long 0x24924925
| .long 0x21FB7813
| .long 0x1F7047DD
| .long 0x1CF06ADB
| .long 0x1A7B9612
| .long 0x18118119
| .long 0x15B1E5F8
| .long 0x135C8114
| .long 0x11111112
| .long 0xECF56BF
| .long 0xC9714FC
| .long 0xA6810A7
| .long 0x8421085
| .long 0x624DD30
| .long 0x4104105
| .long 0x2040811
| /* maximum error: 0.987342 scaled: 0.921875*/
|
|
