backport builds

[dosdemo] / src / util.h

diff --git a/src/util.h b/src/util.h
index eb3773d..8a46036 100644 (file)
--- a/src/util.h
+++ b/src/util.h
@@ -5,14 +5,25 @@
 
 #ifdef __GNUC__
 #define INLINE __inline
+#define PACKED __attribute__((packed))
 
 #elif defined(__WATCOMC__)
 #define INLINE __inline
+#define PACKED
 
 #else
 #define INLINE
+#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
@@ -23,5 +34,193 @@ 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" \
+       "cpuid" \
+       "rdtsc" \
+       "mov [perf_start_count], eax" \
+       modify[eax ebx ecx edx];
+
+void perf_end(void);
+#pragma aux perf_end = \
+       "xor eax, eax" \
+       "cpuid" \
+       "rdtsc" \
+       "sub eax, [perf_start_count]" \
+       "mov [perf_interval_count], eax" \
+       modify [eax ebx ecx edx];
+
+void debug_break(void);
+#pragma aux debug_break = "int 3";
+
+void halt(void);
+#pragma aux halt = "hlt";
+#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" \
+       "rdtsc\n" \
+       "mov %%eax, %0\n" \
+       : "=m"(perf_start_count) \
+       :: "%eax", "%ebx", "%ecx", "%edx")
+
+#define perf_end() asm volatile ( \
+       "xor %%eax, %%eax\n" \
+       "cpuid\n" \
+       "rdtsc\n" \
+       "sub %1, %%eax\n" \
+       "mov %%eax, %0\n" \
+       : "=m"(perf_interval_count) \
+       : "m"(perf_start_count) \
+       : "%eax", "%ebx", "%ecx", "%edx")
+
+#define debug_break() \
+       asm volatile ("int $3")
+
+#define halt() \
+       asm volatile("hlt")
+#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 { \
+                       xor eax, eax \
+                       cpuid \
+                       rdtsc \
+                       mov [perf_start_count], eax \
+               } \
+       } while(0)
+
+#define perf_end() \
+       do { \
+               __asm { \
+                       xor eax, eax \
+                       cpuid \
+                       rdtsc \
+                       sub eax, [perf_start_count] \
+                       mov [perf_interval_count], eax \
+               } \
+       } while(0)
+
+#define debug_break() \
+       do { \
+               __asm { int 3 } \
+       } while(0)
+#endif
 
 #endif /* UTIL_H_ */