| /* |
| * MIPS DSPr2 optimizations for libjpeg-turbo |
| * |
| * Copyright (C) 2013, MIPS Technologies, Inc., California. |
| * All Rights Reserved. |
| * Authors: Teodora Novkovic (teodora.novkovic@imgtec.com) |
| * Darko Laus (darko.laus@imgtec.com) |
| * This software is provided 'as-is', without any express or implied |
| * warranty. In no event will the authors be held liable for any damages |
| * arising from the use of this software. |
| * |
| * Permission is granted to anyone to use this software for any purpose, |
| * including commercial applications, and to alter it and redistribute it |
| * freely, subject to the following restrictions: |
| * |
| * 1. The origin of this software must not be misrepresented; you must not |
| * claim that you wrote the original software. If you use this software |
| * in a product, an acknowledgment in the product documentation would be |
| * appreciated but is not required. |
| * 2. Altered source versions must be plainly marked as such, and must not be |
| * misrepresented as being the original software. |
| * 3. This notice may not be removed or altered from any source distribution. |
| */ |
| |
| #define zero $0 |
| #define AT $1 |
| #define v0 $2 |
| #define v1 $3 |
| #define a0 $4 |
| #define a1 $5 |
| #define a2 $6 |
| #define a3 $7 |
| #define t0 $8 |
| #define t1 $9 |
| #define t2 $10 |
| #define t3 $11 |
| #define t4 $12 |
| #define t5 $13 |
| #define t6 $14 |
| #define t7 $15 |
| #define s0 $16 |
| #define s1 $17 |
| #define s2 $18 |
| #define s3 $19 |
| #define s4 $20 |
| #define s5 $21 |
| #define s6 $22 |
| #define s7 $23 |
| #define t8 $24 |
| #define t9 $25 |
| #define k0 $26 |
| #define k1 $27 |
| #define gp $28 |
| #define sp $29 |
| #define fp $30 |
| #define s8 $30 |
| #define ra $31 |
| |
| #define f0 $f0 |
| #define f1 $f1 |
| #define f2 $f2 |
| #define f3 $f3 |
| #define f4 $f4 |
| #define f5 $f5 |
| #define f6 $f6 |
| #define f7 $f7 |
| #define f8 $f8 |
| #define f9 $f9 |
| #define f10 $f10 |
| #define f11 $f11 |
| #define f12 $f12 |
| #define f13 $f13 |
| #define f14 $f14 |
| #define f15 $f15 |
| #define f16 $f16 |
| #define f17 $f17 |
| #define f18 $f18 |
| #define f19 $f19 |
| #define f20 $f20 |
| #define f21 $f21 |
| #define f22 $f22 |
| #define f23 $f23 |
| #define f24 $f24 |
| #define f25 $f25 |
| #define f26 $f26 |
| #define f27 $f27 |
| #define f28 $f28 |
| #define f29 $f29 |
| #define f30 $f30 |
| #define f31 $f31 |
| |
| /* |
| * LEAF_MIPS32R2 - declare leaf routine for MIPS32r2 |
| */ |
| #define LEAF_MIPS32R2(symbol) \ |
| .globl symbol; \ |
| .align 2; \ |
| .type symbol, @function; \ |
| .ent symbol, 0; \ |
| symbol: .frame sp, 0, ra; \ |
| .set push; \ |
| .set arch=mips32r2; \ |
| .set noreorder; \ |
| .set noat; |
| |
| /* |
| * LEAF_MIPS_DSPR2 - declare leaf routine for MIPS DSPr2 |
| */ |
| #define LEAF_MIPS_DSPR2(symbol) \ |
| LEAF_MIPS32R2(symbol) \ |
| .set dspr2; |
| |
| /* |
| * END - mark end of function |
| */ |
| #define END(function) \ |
| .set pop; \ |
| .end function; \ |
| .size function,.-function |
| |
| /* |
| * Checks if stack offset is big enough for storing/restoring regs_num |
| * number of register to/from stack. Stack offset must be greater than |
| * or equal to the number of bytes needed for storing registers (regs_num*4). |
| * Since MIPS ABI allows usage of first 16 bytes of stack frame (this is |
| * preserved for input arguments of the functions, already stored in a0-a3), |
| * stack size can be further optimized by utilizing this space. |
| */ |
| .macro CHECK_STACK_OFFSET regs_num, stack_offset |
| .if \stack_offset < \regs_num * 4 - 16 |
| .error "Stack offset too small." |
| .endif |
| .endm |
| |
| /* |
| * Saves set of registers on stack. Maximum number of registers that |
| * can be saved on stack is limitted to 14 (a0-a3, v0-v1 and s0-s7). |
| * Stack offset is number of bytes that are added to stack pointer (sp) |
| * before registers are pushed in order to provide enough space on stack |
| * (offset must be multiple of 4, and must be big enough, as described by |
| * CHECK_STACK_OFFSET macro). This macro is intended to be used in |
| * combination with RESTORE_REGS_FROM_STACK macro. Example: |
| * SAVE_REGS_ON_STACK 4, v0, v1, s0, s1 |
| * RESTORE_REGS_FROM_STACK 4, v0, v1, s0, s1 |
| */ |
| .macro SAVE_REGS_ON_STACK stack_offset = 0, r1, \ |
| r2 = 0, r3 = 0, r4 = 0, \ |
| r5 = 0, r6 = 0, r7 = 0, \ |
| r8 = 0, r9 = 0, r10 = 0, \ |
| r11 = 0, r12 = 0, r13 = 0, \ |
| r14 = 0 |
| .if (\stack_offset < 0) || (\stack_offset - (\stack_offset / 4) * 4) |
| .error "Stack offset must be pozitive and multiple of 4." |
| .endif |
| .if \stack_offset != 0 |
| addiu sp, sp, -\stack_offset |
| .endif |
| sw \r1, 0(sp) |
| .if \r2 != 0 |
| sw \r2, 4(sp) |
| .endif |
| .if \r3 != 0 |
| sw \r3, 8(sp) |
| .endif |
| .if \r4 != 0 |
| sw \r4, 12(sp) |
| .endif |
| .if \r5 != 0 |
| CHECK_STACK_OFFSET 5, \stack_offset |
| sw \r5, 16(sp) |
| .endif |
| .if \r6 != 0 |
| CHECK_STACK_OFFSET 6, \stack_offset |
| sw \r6, 20(sp) |
| .endif |
| .if \r7 != 0 |
| CHECK_STACK_OFFSET 7, \stack_offset |
| sw \r7, 24(sp) |
| .endif |
| .if \r8 != 0 |
| CHECK_STACK_OFFSET 8, \stack_offset |
| sw \r8, 28(sp) |
| .endif |
| .if \r9 != 0 |
| CHECK_STACK_OFFSET 9, \stack_offset |
| sw \r9, 32(sp) |
| .endif |
| .if \r10 != 0 |
| CHECK_STACK_OFFSET 10, \stack_offset |
| sw \r10, 36(sp) |
| .endif |
| .if \r11 != 0 |
| CHECK_STACK_OFFSET 11, \stack_offset |
| sw \r11, 40(sp) |
| .endif |
| .if \r12 != 0 |
| CHECK_STACK_OFFSET 12, \stack_offset |
| sw \r12, 44(sp) |
| .endif |
| .if \r13 != 0 |
| CHECK_STACK_OFFSET 13, \stack_offset |
| sw \r13, 48(sp) |
| .endif |
| .if \r14 != 0 |
| CHECK_STACK_OFFSET 14, \stack_offset |
| sw \r14, 52(sp) |
| .endif |
| .endm |
| |
| /* |
| * Restores set of registers from stack. Maximum number of registers that |
| * can be restored from stack is limitted to 14 (a0-a3, v0-v1 and s0-s7). |
| * Stack offset is number of bytes that are added to stack pointer (sp) |
| * after registers are restored (offset must be multiple of 4, and must |
| * be big enough, as described by CHECK_STACK_OFFSET macro). This macro is |
| * intended to be used in combination with RESTORE_REGS_FROM_STACK macro. |
| * Example: |
| * SAVE_REGS_ON_STACK 4, v0, v1, s0, s1 |
| * RESTORE_REGS_FROM_STACK 4, v0, v1, s0, s1 |
| */ |
| .macro RESTORE_REGS_FROM_STACK stack_offset = 0, r1, \ |
| r2 = 0, r3 = 0, r4 = 0, \ |
| r5 = 0, r6 = 0, r7 = 0, \ |
| r8 = 0, r9 = 0, r10 = 0, \ |
| r11 = 0, r12 = 0, r13 = 0, \ |
| r14 = 0 |
| .if (\stack_offset < 0) || (\stack_offset - (\stack_offset/4)*4) |
| .error "Stack offset must be pozitive and multiple of 4." |
| .endif |
| lw \r1, 0(sp) |
| .if \r2 != 0 |
| lw \r2, 4(sp) |
| .endif |
| .if \r3 != 0 |
| lw \r3, 8(sp) |
| .endif |
| .if \r4 != 0 |
| lw \r4, 12(sp) |
| .endif |
| .if \r5 != 0 |
| CHECK_STACK_OFFSET 5, \stack_offset |
| lw \r5, 16(sp) |
| .endif |
| .if \r6 != 0 |
| CHECK_STACK_OFFSET 6, \stack_offset |
| lw \r6, 20(sp) |
| .endif |
| .if \r7 != 0 |
| CHECK_STACK_OFFSET 7, \stack_offset |
| lw \r7, 24(sp) |
| .endif |
| .if \r8 != 0 |
| CHECK_STACK_OFFSET 8, \stack_offset |
| lw \r8, 28(sp) |
| .endif |
| .if \r9 != 0 |
| CHECK_STACK_OFFSET 9, \stack_offset |
| lw \r9, 32(sp) |
| .endif |
| .if \r10 != 0 |
| CHECK_STACK_OFFSET 10, \stack_offset |
| lw \r10, 36(sp) |
| .endif |
| .if \r11 != 0 |
| CHECK_STACK_OFFSET 11, \stack_offset |
| lw \r11, 40(sp) |
| .endif |
| .if \r12 != 0 |
| CHECK_STACK_OFFSET 12, \stack_offset |
| lw \r12, 44(sp) |
| .endif |
| .if \r13 != 0 |
| CHECK_STACK_OFFSET 13, \stack_offset |
| lw \r13, 48(sp) |
| .endif |
| .if \r14 != 0 |
| CHECK_STACK_OFFSET 14, \stack_offset |
| lw \r14, 52(sp) |
| .endif |
| .if \stack_offset != 0 |
| addiu sp, sp, \stack_offset |
| .endif |
| .endm |
| |
| |
