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[libpng10] Imported from libpng-1.0.15rc1.tar

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Glenn Randers-Pehrson
2002-08-23 23:03:28 -05:00
parent 787081f75b
commit 88f07c8451
63 changed files with 442 additions and 356 deletions
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16
pnggccrd.c
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@@ -6,7 +6,7 @@
* and http://www.intel.com/drg/pentiumII/appnotes/923/923.htm
* for Intel's performance analysis of the MMX vs. non-MMX code.
*
* libpng version 1.0.14 - July 8, 2002
* libpng version 1.0.15rc1 - August 24, 2002
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* Copyright (c) 1998, Intel Corporation
@@ -5075,7 +5075,9 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
if (_mmx_supported == 2) {
/* this should have happened in png_init_mmx_flags() already */
#if !defined(PNG_1_0_X)
png_warning(png_ptr, "asm_flags may not have been initialized");
#endif
png_mmx_support();
}
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
@@ -5345,13 +5347,13 @@ png_mmx_support(void)
"pushl %%ecx \n\t" // save original Eflag to stack
"popfl \n\t" // restore original Eflag
"xorl %%ecx, %%eax \n\t" // compare new Eflag with original Eflag
"jz .NOT_SUPPORTED \n\t" // if same, CPUID instr. is not supported
"jz 0f \n\t" // if same, CPUID instr. is not supported
"xorl %%eax, %%eax \n\t" // set eax to zero
// ".byte 0x0f, 0xa2 \n\t" // CPUID instruction (two-byte opcode)
"cpuid \n\t" // get the CPU identification info
"cmpl $1, %%eax \n\t" // make sure eax return non-zero value
"jl .NOT_SUPPORTED \n\t" // if eax is zero, MMX is not supported
"jl 0f \n\t" // if eax is zero, MMX is not supported
"xorl %%eax, %%eax \n\t" // set eax to zero and...
"incl %%eax \n\t" // ...increment eax to 1. This pair is
@@ -5359,14 +5361,14 @@ png_mmx_support(void)
"cpuid \n\t" // get the CPU identification info again
"andl $0x800000, %%edx \n\t" // mask out all bits but MMX bit (23)
"cmpl $0, %%edx \n\t" // 0 = MMX not supported
"jz .NOT_SUPPORTED \n\t" // non-zero = yes, MMX IS supported
"jz 0f \n\t" // non-zero = yes, MMX IS supported
"movl $1, %%eax \n\t" // set return value to 1
"jmp .RETURN \n\t" // DONE: have MMX support
"jmp 1f \n\t" // DONE: have MMX support
".NOT_SUPPORTED: \n\t" // target label for jump instructions
"0: \n\t" // .NOT_SUPPORTED: target label for jump instructions
"movl $0, %%eax \n\t" // set return value to 0
".RETURN: \n\t" // target label for jump instructions
"1: \n\t" // .RETURN: target label for jump instructions
"movl %%eax, _mmx_supported \n\t" // save in global static variable, too
"popl %%edx \n\t" // restore edx
"popl %%ecx \n\t" // restore ecx