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Imported from libpng-1.0.10rc1.tar

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Glenn Randers-Pehrson
2001-03-23 05:06:56 -06:00
parent 1909560348
commit e164447858
52 changed files with 149 additions and 125 deletions
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21
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 1.0.10beta1 - March 14, 2001
* libpng version 1.0.10rc1 - March 23, 2001
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2001 Glenn Randers-Pehrson
* Copyright (c) 1998, Intel Corporation
@@ -2531,7 +2531,7 @@ png_do_read_interlace(png_structp png_ptr)
} // end of _mmx_supported ========================================
else /* MMX not supported: use modified C code - takes advantage
* of inlining of memcpy for a constant */
* of inlining of png_memcpy for a constant */
/* GRR 19991007: does it? or should pixel_bytes in each
* block be replaced with immediate value (e.g., 1)? */
/* GRR 19991017: replaced with constants in each case */
@@ -5148,18 +5148,16 @@ png_mmx_support(void)
"jz .NOT_SUPPORTED \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
".NOT_SUPPORTED: \n\t" // target label for jump instructions
"movl $0, %%eax \n\t" // set return value to 0
".RETURN: \n\t" // 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
"popl %%ebx \n\t" // restore ebx
"ret \n\t" // DONE: have MMX support
".NOT_SUPPORTED: \n\t" // target label for jump instructions
"movl $0, %%eax \n\t" // set return value to 0
// "movl %%eax, _mmx_supported \n\t" // save in global static variable, too
"popl %%edx \n\t" // restore edx
"popl %%ecx \n\t" // restore ecx
"popl %%ebx \n\t" // restore ebx
// "ret \n\t" // DONE: no MMX support
// (fall through to standard C "ret")
@@ -5172,10 +5170,11 @@ png_mmx_support(void)
// , "memory" // if write to a variable gcc thought was in a reg
// , "cc" // "condition codes" (flag bits)
);
#else
_mmx_supported = 0;
#endif /* PNG_MMX_CODE_SUPPORTED */
_mmx_supported = 0;
return 0;
return _mmx_supported;
}
#endif /* PNG_USE_PNGGCCRD */