500 lines
20 KiB
NASM
500 lines
20 KiB
NASM
;
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; jidctfst.asm - fast integer IDCT (MMX)
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;
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; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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; Copyright (C) 2016, D. R. Commander.
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;
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; Based on the x86 SIMD extension for IJG JPEG library
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; Copyright (C) 1999-2006, MIYASAKA Masaru.
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; For conditions of distribution and use, see copyright notice in jsimdext.inc
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;
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; This file should be assembled with NASM (Netwide Assembler),
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; can *not* be assembled with Microsoft's MASM or any compatible
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; assembler (including Borland's Turbo Assembler).
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; NASM is available from http://nasm.sourceforge.net/ or
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; http://sourceforge.net/project/showfiles.php?group_id=6208
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;
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; This file contains a fast, not so accurate integer implementation of
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; the inverse DCT (Discrete Cosine Transform). The following code is
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; based directly on the IJG's original jidctfst.c; see the jidctfst.c
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; for more details.
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%include "jsimdext.inc"
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%include "jdct.inc"
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; --------------------------------------------------------------------------
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%define CONST_BITS 8 ; 14 is also OK.
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%define PASS1_BITS 2
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%if IFAST_SCALE_BITS != PASS1_BITS
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%error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'."
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%endif
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%if CONST_BITS == 8
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F_1_082 equ 277 ; FIX(1.082392200)
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F_1_414 equ 362 ; FIX(1.414213562)
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F_1_847 equ 473 ; FIX(1.847759065)
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F_2_613 equ 669 ; FIX(2.613125930)
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F_1_613 equ (F_2_613 - 256) ; FIX(2.613125930) - FIX(1)
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%else
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; NASM cannot do compile-time arithmetic on floating-point constants.
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%define DESCALE(x, n) (((x) + (1 << ((n) - 1))) >> (n))
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F_1_082 equ DESCALE(1162209775, 30 - CONST_BITS) ; FIX(1.082392200)
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F_1_414 equ DESCALE(1518500249, 30 - CONST_BITS) ; FIX(1.414213562)
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F_1_847 equ DESCALE(1984016188, 30 - CONST_BITS) ; FIX(1.847759065)
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F_2_613 equ DESCALE(2805822602, 30 - CONST_BITS) ; FIX(2.613125930)
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F_1_613 equ (F_2_613 - (1 << CONST_BITS)) ; FIX(2.613125930) - FIX(1)
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%endif
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; --------------------------------------------------------------------------
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SECTION SEG_CONST
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; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow)
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; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw)
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%define PRE_MULTIPLY_SCALE_BITS 2
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%define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS)
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alignz 32
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GLOBAL_DATA(jconst_idct_ifast_mmx)
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EXTN(jconst_idct_ifast_mmx):
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PW_F1414 times 4 dw F_1_414 << CONST_SHIFT
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PW_F1847 times 4 dw F_1_847 << CONST_SHIFT
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PW_MF1613 times 4 dw -F_1_613 << CONST_SHIFT
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PW_F1082 times 4 dw F_1_082 << CONST_SHIFT
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PB_CENTERJSAMP times 8 db CENTERJSAMPLE
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alignz 32
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; --------------------------------------------------------------------------
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SECTION SEG_TEXT
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BITS 32
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;
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; Perform dequantization and inverse DCT on one block of coefficients.
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;
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; GLOBAL(void)
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; jsimd_idct_ifast_mmx(void *dct_table, JCOEFPTR coef_block,
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; JSAMPARRAY output_buf, JDIMENSION output_col)
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;
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%define dct_table(b) (b) + 8 ; jpeg_component_info *compptr
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%define coef_block(b) (b) + 12 ; JCOEFPTR coef_block
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%define output_buf(b) (b) + 16 ; JSAMPARRAY output_buf
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%define output_col(b) (b) + 20 ; JDIMENSION output_col
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%define original_ebp ebp + 0
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%define wk(i) ebp - (WK_NUM - (i)) * SIZEOF_MMWORD
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; mmword wk[WK_NUM]
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%define WK_NUM 2
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%define workspace wk(0) - DCTSIZE2 * SIZEOF_JCOEF
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; JCOEF workspace[DCTSIZE2]
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align 32
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GLOBAL_FUNCTION(jsimd_idct_ifast_mmx)
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EXTN(jsimd_idct_ifast_mmx):
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push ebp
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mov eax, esp ; eax = original ebp
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sub esp, byte 4
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and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits
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mov [esp], eax
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mov ebp, esp ; ebp = aligned ebp
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lea esp, [workspace]
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push ebx
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; push ecx ; need not be preserved
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; push edx ; need not be preserved
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push esi
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push edi
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get_GOT ebx ; get GOT address
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; ---- Pass 1: process columns from input, store into work array.
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; mov eax, [original_ebp]
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mov edx, POINTER [dct_table(eax)] ; quantptr
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mov esi, JCOEFPTR [coef_block(eax)] ; inptr
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lea edi, [workspace] ; JCOEF *wsptr
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mov ecx, DCTSIZE/4 ; ctr
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alignx 16, 7
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.columnloop:
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%ifndef NO_ZERO_COLUMN_TEST_IFAST_MMX
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mov eax, dword [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
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or eax, dword [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
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jnz short .columnDCT
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movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
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movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
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por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
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por mm1, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
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por mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
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por mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
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por mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
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por mm1, mm0
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packsswb mm1, mm1
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movd eax, mm1
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test eax, eax
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jnz short .columnDCT
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; -- AC terms all zero
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movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
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pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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movq mm2, mm0 ; mm0=in0=(00 01 02 03)
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punpcklwd mm0, mm0 ; mm0=(00 00 01 01)
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punpckhwd mm2, mm2 ; mm2=(02 02 03 03)
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movq mm1, mm0
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punpckldq mm0, mm0 ; mm0=(00 00 00 00)
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punpckhdq mm1, mm1 ; mm1=(01 01 01 01)
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movq mm3, mm2
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punpckldq mm2, mm2 ; mm2=(02 02 02 02)
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punpckhdq mm3, mm3 ; mm3=(03 03 03 03)
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movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0
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movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0
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movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
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movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1
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movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
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movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2
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movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
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movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3
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jmp near .nextcolumn
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alignx 16, 7
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%endif
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.columnDCT:
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; -- Even part
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movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
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movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
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pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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pmullw mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
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movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
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pmullw mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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pmullw mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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movq mm4, mm0
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movq mm5, mm1
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psubw mm0, mm2 ; mm0=tmp11
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psubw mm1, mm3
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paddw mm4, mm2 ; mm4=tmp10
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paddw mm5, mm3 ; mm5=tmp13
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psllw mm1, PRE_MULTIPLY_SCALE_BITS
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pmulhw mm1, [GOTOFF(ebx,PW_F1414)]
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psubw mm1, mm5 ; mm1=tmp12
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movq mm6, mm4
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movq mm7, mm0
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psubw mm4, mm5 ; mm4=tmp3
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psubw mm0, mm1 ; mm0=tmp2
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paddw mm6, mm5 ; mm6=tmp0
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paddw mm7, mm1 ; mm7=tmp1
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movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3
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movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2
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; -- Odd part
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movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
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movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
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pmullw mm2, MMWORD [MMBLOCK(1,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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pmullw mm3, MMWORD [MMBLOCK(3,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
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movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
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pmullw mm5, MMWORD [MMBLOCK(5,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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pmullw mm1, MMWORD [MMBLOCK(7,0,edx,SIZEOF_IFAST_MULT_TYPE)]
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movq mm4, mm2
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movq mm0, mm5
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psubw mm2, mm1 ; mm2=z12
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psubw mm5, mm3 ; mm5=z10
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paddw mm4, mm1 ; mm4=z11
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paddw mm0, mm3 ; mm0=z13
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movq mm1, mm5 ; mm1=z10(unscaled)
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psllw mm2, PRE_MULTIPLY_SCALE_BITS
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psllw mm5, PRE_MULTIPLY_SCALE_BITS
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movq mm3, mm4
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psubw mm4, mm0
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paddw mm3, mm0 ; mm3=tmp7
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psllw mm4, PRE_MULTIPLY_SCALE_BITS
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pmulhw mm4, [GOTOFF(ebx,PW_F1414)] ; mm4=tmp11
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; To avoid overflow...
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;
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; (Original)
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; tmp12 = -2.613125930 * z10 + z5;
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;
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; (This implementation)
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; tmp12 = (-1.613125930 - 1) * z10 + z5;
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; = -1.613125930 * z10 - z10 + z5;
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movq mm0, mm5
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paddw mm5, mm2
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pmulhw mm5, [GOTOFF(ebx,PW_F1847)] ; mm5=z5
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pmulhw mm0, [GOTOFF(ebx,PW_MF1613)]
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pmulhw mm2, [GOTOFF(ebx,PW_F1082)]
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psubw mm0, mm1
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psubw mm2, mm5 ; mm2=tmp10
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paddw mm0, mm5 ; mm0=tmp12
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; -- Final output stage
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psubw mm0, mm3 ; mm0=tmp6
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movq mm1, mm6
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movq mm5, mm7
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paddw mm6, mm3 ; mm6=data0=(00 01 02 03)
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paddw mm7, mm0 ; mm7=data1=(10 11 12 13)
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psubw mm1, mm3 ; mm1=data7=(70 71 72 73)
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psubw mm5, mm0 ; mm5=data6=(60 61 62 63)
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psubw mm4, mm0 ; mm4=tmp5
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movq mm3, mm6 ; transpose coefficients(phase 1)
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punpcklwd mm6, mm7 ; mm6=(00 10 01 11)
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punpckhwd mm3, mm7 ; mm3=(02 12 03 13)
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movq mm0, mm5 ; transpose coefficients(phase 1)
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punpcklwd mm5, mm1 ; mm5=(60 70 61 71)
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punpckhwd mm0, mm1 ; mm0=(62 72 63 73)
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movq mm7, MMWORD [wk(0)] ; mm7=tmp2
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movq mm1, MMWORD [wk(1)] ; mm1=tmp3
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movq MMWORD [wk(0)], mm5 ; wk(0)=(60 70 61 71)
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movq MMWORD [wk(1)], mm0 ; wk(1)=(62 72 63 73)
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paddw mm2, mm4 ; mm2=tmp4
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movq mm5, mm7
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movq mm0, mm1
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paddw mm7, mm4 ; mm7=data2=(20 21 22 23)
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paddw mm1, mm2 ; mm1=data4=(40 41 42 43)
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psubw mm5, mm4 ; mm5=data5=(50 51 52 53)
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psubw mm0, mm2 ; mm0=data3=(30 31 32 33)
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movq mm4, mm7 ; transpose coefficients(phase 1)
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punpcklwd mm7, mm0 ; mm7=(20 30 21 31)
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punpckhwd mm4, mm0 ; mm4=(22 32 23 33)
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movq mm2, mm1 ; transpose coefficients(phase 1)
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punpcklwd mm1, mm5 ; mm1=(40 50 41 51)
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punpckhwd mm2, mm5 ; mm2=(42 52 43 53)
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movq mm0, mm6 ; transpose coefficients(phase 2)
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punpckldq mm6, mm7 ; mm6=(00 10 20 30)
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punpckhdq mm0, mm7 ; mm0=(01 11 21 31)
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movq mm5, mm3 ; transpose coefficients(phase 2)
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punpckldq mm3, mm4 ; mm3=(02 12 22 32)
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punpckhdq mm5, mm4 ; mm5=(03 13 23 33)
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movq mm7, MMWORD [wk(0)] ; mm7=(60 70 61 71)
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movq mm4, MMWORD [wk(1)] ; mm4=(62 72 63 73)
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movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm6
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movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0
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movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm3
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movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5
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movq mm6, mm1 ; transpose coefficients(phase 2)
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punpckldq mm1, mm7 ; mm1=(40 50 60 70)
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punpckhdq mm6, mm7 ; mm6=(41 51 61 71)
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movq mm0, mm2 ; transpose coefficients(phase 2)
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punpckldq mm2, mm4 ; mm2=(42 52 62 72)
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punpckhdq mm0, mm4 ; mm0=(43 53 63 73)
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movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm1
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movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm6
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movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2
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movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm0
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.nextcolumn:
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add esi, byte 4*SIZEOF_JCOEF ; coef_block
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add edx, byte 4*SIZEOF_IFAST_MULT_TYPE ; quantptr
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add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr
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dec ecx ; ctr
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jnz near .columnloop
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; ---- Pass 2: process rows from work array, store into output array.
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mov eax, [original_ebp]
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lea esi, [workspace] ; JCOEF *wsptr
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mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *)
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mov eax, JDIMENSION [output_col(eax)]
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mov ecx, DCTSIZE/4 ; ctr
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alignx 16, 7
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.rowloop:
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; -- Even part
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movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
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movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
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movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
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movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
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movq mm4, mm0
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movq mm5, mm1
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psubw mm0, mm2 ; mm0=tmp11
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psubw mm1, mm3
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paddw mm4, mm2 ; mm4=tmp10
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paddw mm5, mm3 ; mm5=tmp13
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psllw mm1, PRE_MULTIPLY_SCALE_BITS
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pmulhw mm1, [GOTOFF(ebx,PW_F1414)]
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psubw mm1, mm5 ; mm1=tmp12
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movq mm6, mm4
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movq mm7, mm0
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psubw mm4, mm5 ; mm4=tmp3
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psubw mm0, mm1 ; mm0=tmp2
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paddw mm6, mm5 ; mm6=tmp0
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paddw mm7, mm1 ; mm7=tmp1
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movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3
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movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2
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; -- Odd part
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movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
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movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
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movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
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movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
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movq mm4, mm2
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movq mm0, mm5
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psubw mm2, mm1 ; mm2=z12
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psubw mm5, mm3 ; mm5=z10
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paddw mm4, mm1 ; mm4=z11
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paddw mm0, mm3 ; mm0=z13
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movq mm1, mm5 ; mm1=z10(unscaled)
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psllw mm2, PRE_MULTIPLY_SCALE_BITS
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psllw mm5, PRE_MULTIPLY_SCALE_BITS
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movq mm3, mm4
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psubw mm4, mm0
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paddw mm3, mm0 ; mm3=tmp7
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psllw mm4, PRE_MULTIPLY_SCALE_BITS
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pmulhw mm4, [GOTOFF(ebx,PW_F1414)] ; mm4=tmp11
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; To avoid overflow...
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;
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; (Original)
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; tmp12 = -2.613125930 * z10 + z5;
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;
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; (This implementation)
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; tmp12 = (-1.613125930 - 1) * z10 + z5;
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; = -1.613125930 * z10 - z10 + z5;
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movq mm0, mm5
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paddw mm5, mm2
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pmulhw mm5, [GOTOFF(ebx,PW_F1847)] ; mm5=z5
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pmulhw mm0, [GOTOFF(ebx,PW_MF1613)]
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pmulhw mm2, [GOTOFF(ebx,PW_F1082)]
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psubw mm0, mm1
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psubw mm2, mm5 ; mm2=tmp10
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paddw mm0, mm5 ; mm0=tmp12
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; -- Final output stage
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psubw mm0, mm3 ; mm0=tmp6
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movq mm1, mm6
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movq mm5, mm7
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paddw mm6, mm3 ; mm6=data0=(00 10 20 30)
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paddw mm7, mm0 ; mm7=data1=(01 11 21 31)
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psraw mm6, (PASS1_BITS+3) ; descale
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psraw mm7, (PASS1_BITS+3) ; descale
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psubw mm1, mm3 ; mm1=data7=(07 17 27 37)
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psubw mm5, mm0 ; mm5=data6=(06 16 26 36)
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psraw mm1, (PASS1_BITS+3) ; descale
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psraw mm5, (PASS1_BITS+3) ; descale
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psubw mm4, mm0 ; mm4=tmp5
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|
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packsswb mm6, mm5 ; mm6=(00 10 20 30 06 16 26 36)
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packsswb mm7, mm1 ; mm7=(01 11 21 31 07 17 27 37)
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movq mm3, MMWORD [wk(0)] ; mm3=tmp2
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movq mm0, MMWORD [wk(1)] ; mm0=tmp3
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|
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paddw mm2, mm4 ; mm2=tmp4
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movq mm5, mm3
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|
movq mm1, mm0
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|
paddw mm3, mm4 ; mm3=data2=(02 12 22 32)
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paddw mm0, mm2 ; mm0=data4=(04 14 24 34)
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|
psraw mm3, (PASS1_BITS+3) ; descale
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|
psraw mm0, (PASS1_BITS+3) ; descale
|
|
psubw mm5, mm4 ; mm5=data5=(05 15 25 35)
|
|
psubw mm1, mm2 ; mm1=data3=(03 13 23 33)
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|
psraw mm5, (PASS1_BITS+3) ; descale
|
|
psraw mm1, (PASS1_BITS+3) ; descale
|
|
|
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movq mm4, [GOTOFF(ebx,PB_CENTERJSAMP)] ; mm4=[PB_CENTERJSAMP]
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|
|
|
packsswb mm3, mm0 ; mm3=(02 12 22 32 04 14 24 34)
|
|
packsswb mm1, mm5 ; mm1=(03 13 23 33 05 15 25 35)
|
|
|
|
paddb mm6, mm4
|
|
paddb mm7, mm4
|
|
paddb mm3, mm4
|
|
paddb mm1, mm4
|
|
|
|
movq mm2, mm6 ; transpose coefficients(phase 1)
|
|
punpcklbw mm6, mm7 ; mm6=(00 01 10 11 20 21 30 31)
|
|
punpckhbw mm2, mm7 ; mm2=(06 07 16 17 26 27 36 37)
|
|
movq mm0, mm3 ; transpose coefficients(phase 1)
|
|
punpcklbw mm3, mm1 ; mm3=(02 03 12 13 22 23 32 33)
|
|
punpckhbw mm0, mm1 ; mm0=(04 05 14 15 24 25 34 35)
|
|
|
|
movq mm5, mm6 ; transpose coefficients(phase 2)
|
|
punpcklwd mm6, mm3 ; mm6=(00 01 02 03 10 11 12 13)
|
|
punpckhwd mm5, mm3 ; mm5=(20 21 22 23 30 31 32 33)
|
|
movq mm4, mm0 ; transpose coefficients(phase 2)
|
|
punpcklwd mm0, mm2 ; mm0=(04 05 06 07 14 15 16 17)
|
|
punpckhwd mm4, mm2 ; mm4=(24 25 26 27 34 35 36 37)
|
|
|
|
movq mm7, mm6 ; transpose coefficients(phase 3)
|
|
punpckldq mm6, mm0 ; mm6=(00 01 02 03 04 05 06 07)
|
|
punpckhdq mm7, mm0 ; mm7=(10 11 12 13 14 15 16 17)
|
|
movq mm1, mm5 ; transpose coefficients(phase 3)
|
|
punpckldq mm5, mm4 ; mm5=(20 21 22 23 24 25 26 27)
|
|
punpckhdq mm1, mm4 ; mm1=(30 31 32 33 34 35 36 37)
|
|
|
|
pushpic ebx ; save GOT address
|
|
|
|
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
|
|
mov ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
|
|
movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm6
|
|
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm7
|
|
mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
|
|
mov ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
|
|
movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm5
|
|
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm1
|
|
|
|
poppic ebx ; restore GOT address
|
|
|
|
add esi, byte 4*SIZEOF_JCOEF ; wsptr
|
|
add edi, byte 4*SIZEOF_JSAMPROW
|
|
dec ecx ; ctr
|
|
jnz near .rowloop
|
|
|
|
emms ; empty MMX state
|
|
|
|
pop edi
|
|
pop esi
|
|
; pop edx ; need not be preserved
|
|
; pop ecx ; need not be preserved
|
|
pop ebx
|
|
mov esp, ebp ; esp <- aligned ebp
|
|
pop esp ; esp <- original ebp
|
|
pop ebp
|
|
ret
|
|
|
|
; For some reason, the OS X linker does not honor the request to align the
|
|
; segment unless we do this.
|
|
align 32
|