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memset-linux: use std memset for memset_8 

This memset is only used in the init (to clear the page that will
contains the dynarec dispatcher
This commit is contained in:
Gregory Hainaut 2015-10-27 16:36:59 +01:00
parent 344d6c201e
commit 2194685d76
1 changed files with 2 additions and 108 deletions
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110
common/include/Utilities/lnx_memzero.h
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@ -50,117 +50,11 @@ static __fi void memset8( T& obj )
} }
} }
// An optimized memset for 8 bit destination data. // Code is only called in the init so no need to bother with ASM
template< u8 data, size_t bytes > template< u8 data, size_t bytes >
static __fi void memset_8( void *dest ) static __fi void memset_8( void *dest )
{ {
if( bytes == 0 ) return; memset(dest, data, bytes);
if( (bytes & 0x3) != 0 )
{
// unaligned data length. No point in doing an optimized inline version (too complicated!)
// So fall back on the compiler implementation:
memset( dest, data, bytes );
return;
}
// This function only works on 32-bit alignments of data copied.
jASSUME( (bytes & 0x3) == 0 );
enum
{
remdat = bytes>>2,
data32 = data + (data<<8) + (data<<16) + (data<<24)
};
// macro to execute the x86/32 "stosd" copies.
switch( remdat )
{
#if 0
case 1:
*(u32*)dest = data32;
return;
case 2:
((u32*)dest)[0] = data32;
((u32*)dest)[1] = data32;
return;
case 3:
__asm__ volatile
(
".intel_syntax noprefix\n"
"cld\n"
// "mov edi, %[dest]\n"
// "mov eax, %[data32]\n"
"stosd\n"
"stosd\n"
"stosd\n"
".att_syntax\n"
: "=D"(dest)
// Input specifiers: D - edi, a -- eax, c ecx
: [dest]"D"(dest), [data32]"a"(data32)
: "memory"
);
return;
case 4:
__asm__ volatile
(
".intel_syntax noprefix\n"
"cld\n"
// "mov edi, %[dest]\n"
// "mov eax, %[data32]\n"
"stosd\n"
"stosd\n"
"stosd\n"
"stosd\n"
".att_syntax\n"
: "=D"(dest)
: [dest]"D"(dest), [data32]"a"(data32)
: "memory"
);
return;
case 5:
__asm__ volatile
(
".intel_syntax noprefix\n"
"cld\n"
// "mov edi, %[dest]\n"
// "mov eax, %[data32]\n"
"stosd\n"
"stosd\n"
"stosd\n"
"stosd\n"
"stosd\n"
".att_syntax\n"
: "=D"(dest)
: [dest]"D"(dest), [data32]"a"(data32)
: "memory"
);
return;
#endif
default:
__asm__ volatile
(
".intel_syntax noprefix\n"
"cld\n"
// "mov ecx, %[remdat]\n"
// "mov edi, %[dest]\n"
// "mov eax, %\[data32]n"
"rep stosd\n"
".att_syntax\n"
: "=D"(dest)
: [remdat]"c"(remdat), [dest]"D"(dest), [data32]"a"(data32)
: "memory"
);
return;
}
} }
#endif #endif