1 files changed, 104 insertions, 0 deletions
diff --git a/media/libjpeg/simd/jsimdcpu.asm b/media/libjpeg/simd/jsimdcpu.asm
new file mode 100644
index 000000000..599083b18
--- /dev/null
+++ b/media/libjpeg/simd/jsimdcpu.asm
@@ -0,0 +1,104 @@
+;
+; jsimdcpu.asm - SIMD instruction support check
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+;
+; Based on the x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+
+; --------------------------------------------------------------------------
+        SECTION SEG_TEXT
+        BITS    32
+;
+; Check if the CPU supports SIMD instructions
+;
+; GLOBAL(unsigned int)
+; jpeg_simd_cpu_support (void)
+;
+
+        align   16
+        global  EXTN(jpeg_simd_cpu_support)
+
+EXTN(jpeg_simd_cpu_support):
+        push    ebx
+;       push    ecx             ; need not be preserved
+;       push    edx             ; need not be preserved
+;       push    esi             ; unused
+        push    edi
+
+        xor     edi,edi                 ; simd support flag
+
+        pushfd
+        pop     eax
+        mov     edx,eax
+        xor     eax, 1<<21              ; flip ID bit in EFLAGS
+        push    eax
+        popfd
+        pushfd
+        pop     eax
+        xor     eax,edx
+        jz      short .return           ; CPUID is not supported
+
+        ; Check for MMX instruction support
+        xor     eax,eax
+        cpuid
+        test    eax,eax
+        jz      short .return
+
+        xor     eax,eax
+        inc     eax
+        cpuid
+        mov     eax,edx                 ; eax = Standard feature flags
+
+        test    eax, 1<<23              ; bit23:MMX
+        jz      short .no_mmx
+        or      edi, byte JSIMD_MMX
+.no_mmx:
+        test    eax, 1<<25              ; bit25:SSE
+        jz      short .no_sse
+        or      edi, byte JSIMD_SSE
+.no_sse:
+        test    eax, 1<<26              ; bit26:SSE2
+        jz      short .no_sse2
+        or      edi, byte JSIMD_SSE2
+.no_sse2:
+
+        ; Check for 3DNow! instruction support
+        mov     eax, 0x80000000
+        cpuid
+        cmp     eax, 0x80000000
+        jbe     short .return
+
+        mov     eax, 0x80000001
+        cpuid
+        mov     eax,edx                 ; eax = Extended feature flags
+
+        test    eax, 1<<31              ; bit31:3DNow!(vendor independent)
+        jz      short .no_3dnow
+        or      edi, byte JSIMD_3DNOW
+.no_3dnow:
+
+.return:
+        mov     eax,edi
+
+        pop     edi
+;       pop     esi             ; unused
+;       pop     edx             ; need not be preserved
+;       pop     ecx             ; need not be preserved
+        pop     ebx
+        ret
+
+; For some reason, the OS X linker does not honor the request to align the
+; segment unless we do this.
+        align   16