backport builds

[dosdemo] / src / util.h

diff --git a/src/util.h b/src/util.h
index b305d78..8a46036 100644 (file)
--- a/src/util.h
+++ b/src/util.h
@@ -16,6 +16,14 @@
 #define PACKED
 #endif
 
+#define BSWAP16(x)     ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
+#define BSWAP32(x)     \
+       ((((x) >> 24) & 0xff) | \
+        (((x) >> 8) & 0xff00) | \
+        (((x) << 8) & 0xff0000) | \
+        ((x) << 24))
+
+#if defined(__i386__) || defined(__x86_64__) || defined(__386__) || defined(MSDOS)
 /* fast conversion of double -> 32bit int
  * for details see:
  *  - http://chrishecker.com/images/f/fb/Gdmfp.pdf
@@ -26,10 +34,56 @@ static INLINE int32_t cround64(double val)
        val += 6755399441055744.0;
        return *(int32_t*)&val;
 }
+#else
+#define cround64(x)    ((int32_t)(x))
+#endif
+
+static INLINE float rsqrt(float x)
+{
+       float xhalf = x * 0.5f;
+       int32_t i = *(int32_t*)&x;
+       i = 0x5f3759df - (i >> 1);
+       x = *(float*)&i;
+       x = x * (1.5f - xhalf * x * x);
+       return x;
+}
 
 extern uint32_t perf_start_count, perf_interval_count;
 
 #ifdef __WATCOMC__
+void memset16(void *dest, uint16_t val, int count);
+#pragma aux memset16 = \
+       "cld" \
+       "test ecx, 1" \
+       "jz memset16_dwords" \
+       "rep stosw" \
+       "jmp memset16_done" \
+       "memset16_dwords:" \
+       "shr ecx, 1" \
+       "push ax" \
+       "shl eax, 16" \
+       "pop ax" \
+       "rep stosd" \
+       "memset16_done:" \
+       parm[edi][ax][ecx];
+
+#ifdef USE_MMX
+void memcpy64(void *dest, void *src, int count);
+#pragma aux memcpy64 = \
+       "cploop:" \
+       "movq mm0, [edx]" \
+       "movq [ebx], mm0" \
+       "add edx, 8" \
+       "add ebx, 8" \
+       "dec ecx" \
+       "jnz cploop" \
+       "emms" \
+       parm[ebx][edx][ecx] \
+       modify[8087];
+#else
+#define memcpy64(dest, src, count)     memcpy(dest, src, (count) << 3)
+#endif
+
 void perf_start(void);
 #pragma aux perf_start = \
        "xor eax, eax" \
@@ -52,14 +106,49 @@ void debug_break(void);
 
 void halt(void);
 #pragma aux halt = "hlt";
-
-void memset16(void *ptr, int val, int count);
-#pragma aux memset16 = \
-       "rep stosw" \
-       parm[edi][eax][ecx];
 #endif
 
 #ifdef __GNUC__
+#if defined(__i386__) || defined(__x86_64__)
+#define memset16(dest, val, count) asm volatile ( \
+       "cld\n\t" \
+       "test $1, %2\n\t" \
+       "jz 0f\n\t" \
+       "rep stosw\n\t" \
+       "jmp 1f\n\t" \
+       "0:\n\t" \
+       "shr $1, %2\n\t" \
+       "push %%ax\n\t" \
+       "shl $16, %%eax\n\t" \
+       "pop %%ax\n\t" \
+       "rep stosl\n\t" \
+       "1:\n\t"\
+       :: "D"(dest), "a"((uint16_t)(val)), "c"(count) \
+       : "memory")
+#else
+static void INLINE memset16(void *dest, uint16_t val, int count)
+{
+       uint16_t *ptr = dest;
+       while(count--) *ptr++ = val;
+}
+#endif
+
+#ifdef USE_MMX
+#define memcpy64(dest, src, count) asm volatile ( \
+       "0:\n\t" \
+       "movq (%1), %%mm0\n\t" \
+       "movq %%mm0, (%0)\n\t" \
+       "add $8, %1\n\t" \
+       "add $8, %0\n\t" \
+       "dec %2\n\t" \
+       "jnz 0b\n\t" \
+       "emms\n\t" \
+       :: "r"(dest), "r"(src), "r"(count) \
+       : "%mm0")
+#else
+#define memcpy64(dest, src, count)     memcpy(dest, src, (count) << 3)
+#endif
+
 #define perf_start()  asm volatile ( \
        "xor %%eax, %%eax\n" \
        "cpuid\n" \
@@ -83,13 +172,30 @@ void memset16(void *ptr, int val, int count);
 
 #define halt() \
        asm volatile("hlt")
-
-#define memset16(ptr, val, count) asm volatile ( \
-       "rep stosw\n\t" \
-       :: "D"(ptr), "a"(val), "c"(count))
 #endif
 
 #ifdef _MSC_VER
+void __inline memset16(void *dest, uint16_t val, int count)
+{
+       __asm {
+               cld
+               mov ax, val
+               mov edi, dest
+               mov ecx, count
+               test ecx, 1
+               jz memset16_dwords
+               rep stosw
+               jmp memset16_done
+               memset16_dwords:
+               shr ecx, 1
+               push ax
+               shl eax, 16
+               pop ax
+               rep stosd
+               memset16_done:
+       }
+}
+
 #define perf_start() \
        do { \
                __asm { \
@@ -115,16 +221,6 @@ void memset16(void *ptr, int val, int count);
        do { \
                __asm { int 3 } \
        } while(0)
-
-#define memset16(ptr, val, count) \
-       do { \
-               __asm { \
-                       mov edi, ptr \
-                       mov ecx, count \
-                       mov eax, val \
-                       rep stosw \
-               } \
-       } while(0)
 #endif
 
 #endif /* UTIL_H_ */