| /* Copyright (C) 2008-2021 Free Software Foundation, Inc. |
| Contributor: Joern Rennecke <joern.rennecke@embecosm.com> |
| on behalf of Synopsys 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/>. */ |
| |
| #include "arc-ieee-754.h" |
| |
| #if 0 /* DEBUG */ |
| .global __divsf3 |
| FUNC(__divsf3) |
| .balign 4 |
| __divsf3: |
| push_s blink |
| push_s r1 |
| bl.d __divsf3_c |
| push_s r0 |
| ld_s r1,[sp,4] |
| st_s r0,[sp,4] |
| bl.d __divsf3_asm |
| pop_s r0 |
| pop_s r1 |
| pop_s blink |
| cmp r0,r1 |
| #if 1 |
| bne abort |
| jeq_s [blink] |
| b abort |
| #else |
| bne abort |
| j_s [blink] |
| #endif |
| ENDFUNC(__divsf3) |
| #define __divsf3 __divsf3_asm |
| #endif /* DEBUG */ |
| |
| .balign 4 |
| __divdf3_support: /* This label makes debugger output saner. */ |
| FUNC(__divsf3) |
| .Ldenorm_fp0: |
| norm.f r12,r2 ; flag for 0/x -> 0 check |
| bic.ne.f 0,0x60000000,r1 ; denorm/large number -> 0 |
| beq_s .Lret0_NaN |
| tst r1,r9 |
| add_s r2,r2,r2 |
| sub_s r12,r12,8 |
| asl_s r2,r2,r12 |
| asl_l r12,r12,23 |
| bne.d .Lpast_denorm_fp0 |
| add r5,r5,r12 |
| /* r0 is subnormal, r1 is subnormal or 0. */ |
| |
| .balign 4 |
| .Ldenorm_fp1: |
| norm.f r12,r3 ; flag for x/0 -> Inf check |
| bic.ne.f 0,0x60000000,r0 ; large number/denorm -> Inf |
| beq_s .Linf |
| add_s r3,r3,r3 |
| sub_s r12,r12,8 |
| asl_s r3,r3,r12 |
| asl_s r12,r12,23 |
| b.d .Lpast_denorm_fp1 |
| add r4,r4,r12 |
| |
| .Lret0_NaN: |
| bclr.f 0,r1,31 ; 0/0 -> NaN |
| bic r0,r10,r9 |
| j_s.d [blink] |
| sub.eq r0,r0,1 |
| |
| .global __divsf3 |
| .balign 4 |
| .long 0x7f800000 ; exponent mask |
| __divsf3: |
| ld r9,[pcl,-4] |
| bmsk r2,r0,22 |
| xor r4,r0,r2 |
| bmsk r3,r1,22 |
| xor r5,r1,r3 |
| and r11,r0,r9 |
| breq.d r11,0,.Ldenorm_fp0 |
| xor r10,r4,r5 |
| breq r11,r9,.Linf_nan_fp0 |
| bset_s r2,r2,23 |
| and r11,r1,r9 |
| breq r11,0,.Ldenorm_fp1 |
| breq r11,r9,.Linf_nan_fp1 |
| .Lpast_denorm_fp0: |
| bset_s r3,r3,23 |
| .Lpast_denorm_fp1: |
| cmp r2,r3 |
| asl_s r2,r2,6+1 |
| asl_s r3,r3,7 |
| add.lo r2,r2,r2 |
| bclr r8,r9,30 ; exponent bias |
| bclr.lo r8,r8,23 ; reduce exp by one if fraction is shifted |
| sub r4,r4,r5 |
| add r4,r4,r8 |
| xor.f 0,r10,r4 |
| bmi .Linf_denorm |
| and r12,r4,r9 |
| breq r12,0,.Ldenorm |
| sub_s r2,r2,r3 ; discard implicit 1 |
| .Ldiv_23bit: |
| .rep 6 |
| divaw r2,r2,r3 |
| .endr |
| breq r12,r9,.Linf |
| bmsk r0,r2,6 |
| xor_s r2,r2,r0 |
| .Ldiv_17bit: |
| .rep 7 |
| divaw r2,r2,r3 |
| .endr |
| asl_s r0,r0,7 |
| bmsk r1,r2,6 |
| xor_s r2,r2,r1 |
| or_s r0,r0,r1 |
| .Ldiv_10bit: |
| .rep 7 |
| divaw r2,r2,r3 |
| .endr |
| asl_s r0,r0,7 |
| bmsk r1,r2,6 |
| xor_s r2,r2,r1 |
| or_s r0,r0,r1 |
| .Ldiv_3bit: |
| .rep 3 |
| divaw r2,r2,r3 |
| .endr |
| asl_s r0,r0,3 |
| .Ldiv_0bit: |
| divaw r1,r2,r3 |
| bmsk_s r2,r2,2 |
| tst r1,-0x7e ; 0xffffff82, test for rest or odd |
| bmsk_s r1,r1,0 |
| add_s r0,r0,r2 ; assemble fraction |
| add_s r0,r0,r4 ; add in sign & exponent |
| j_s.d [blink] |
| add.ne r0,r0,r1 ; round to nearest / even |
| |
| .balign 4 |
| .Linf_nan_fp0: |
| bic.f 0,r9,r1 ; fp1 Inf -> result NaN |
| bic r1,r5,r9 ; fp1 sign |
| sub.eq r1,r1,1 |
| j_s.d [blink] |
| xor_s r0,r0,r1 |
| .Linf_nan_fp1: |
| bic r0,r4,r9 ; fp0 sign |
| bmsk.f 0,r1,22 ; x/inf -> 0, x/nan -> nan |
| xor.eq r1,r1,r9 |
| j_s.d [blink] |
| xor_s r0,r0,r1 |
| .Linf: |
| j_s.d [blink] |
| or r0,r10,r9 |
| |
| .Lret_r4: |
| j_s.d [blink] |
| mov_s r0,r4 |
| .balign 4 |
| .Linf_denorm: |
| add.f r12,r4,r4 |
| asr_l r12,r12,24 |
| bpl .Linf |
| max r12,r12,-24 |
| .Ldenorm: |
| add r1,pcl,42; .Ldenorm_tab-. |
| ldb_s r12,[r12,r1] |
| mov_s r0,0 |
| lsr_s r2,r2 |
| sub_s r1,r1,r12 |
| j_s.d [r1] |
| bic r4,r10,r9 |
| .byte .Ldenorm_tab-.Lret_r4 |
| .byte .Ldenorm_tab-.Ldiv_0bit |
| .byte .Ldenorm_tab-.Ldiv_3bit-8 |
| .byte .Ldenorm_tab-.Ldiv_3bit-4 |
| .byte .Ldenorm_tab-.Ldiv_3bit |
| .byte .Ldenorm_tab-.Ldiv_10bit-24 |
| .byte .Ldenorm_tab-.Ldiv_10bit-20 |
| .byte .Ldenorm_tab-.Ldiv_10bit-16 |
| .byte .Ldenorm_tab-.Ldiv_10bit-12 |
| .byte .Ldenorm_tab-.Ldiv_10bit-8 |
| .byte .Ldenorm_tab-.Ldiv_10bit-4 |
| .byte .Ldenorm_tab-.Ldiv_10bit |
| .byte .Ldenorm_tab-.Ldiv_17bit-24 |
| .byte .Ldenorm_tab-.Ldiv_17bit-20 |
| .byte .Ldenorm_tab-.Ldiv_17bit-16 |
| .byte .Ldenorm_tab-.Ldiv_17bit-12 |
| .byte .Ldenorm_tab-.Ldiv_17bit-8 |
| .byte .Ldenorm_tab-.Ldiv_17bit-4 |
| .byte .Ldenorm_tab-.Ldiv_17bit |
| .byte .Ldenorm_tab-.Ldiv_23bit-20 |
| .byte .Ldenorm_tab-.Ldiv_23bit-16 |
| .byte .Ldenorm_tab-.Ldiv_23bit-12 |
| .byte .Ldenorm_tab-.Ldiv_23bit-8 |
| .byte .Ldenorm_tab-.Ldiv_23bit-4 |
| .Ldenorm_tab: |
| .byte .Ldenorm_tab-.Ldiv_23bit |
| ENDFUNC(__divsf3) |
