IJG R6b with x86SIMD V1.02

Independent JPEG Group's JPEG software release 6b with x86 SIMD extension for IJG JPEG library version 1.02
2006-02-04 00:00:00 +00:00
parent 5ead57a34a
commit a2e6a9dd47
156 changed files with 49018 additions and 4283 deletions
--- a/jsimdgcc.c
+++ b/jsimdgcc.c
@@ -0,0 +1,95 @@
+/*
+ * jsimdgcc.c - SIMD instruction support check (gcc)
+ *
+ * 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
+ *
+ * Last Modified : January 24, 2006
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+#include <setjmp.h>
+#include <signal.h>
+
+
+static volatile int lockf /* = 0 */;
+static jmp_buf jmpbuf;
+
+
+/*
+ * Exception handler for signal()
+ */
+
+LOCAL(void)
+exception_handler (int sig)
+{
+  signal(SIGILL, SIG_DFL);
+  longjmp(jmpbuf, 1);
+}
+
+
+/*
+ * Check if the OS supports SIMD instructions
+ */
+
+GLOBAL(unsigned int)
+jpeg_simd_os_support (unsigned int simd)
+{
+#ifdef __GNUC__		/* gcc (i386) */
+  unsigned int mxcsr = 0x1F80;
+
+  /* enter critical section */
+  __asm__ __volatile__ (
+  "get_lock:                  \n\t"
+    "movl  $1,%%eax           \n\t"
+    "xchgl %0,%%eax           \n\t"	/* try to get lock */
+    "cmpl  $0,%%eax           \n\t"	/* test if successful */
+    "je    critical_section   \n"
+  "spin_loop:                 \n\t"
+  /*".byte 0xF3,0x90          \n\t"*/	/* "pause" on P4 (short delay) */
+    "cmpl  $0,%0              \n\t"	/* check if lock is free */
+    "jne   spin_loop          \n\t"
+    "jmp   get_lock           \n"
+  "critical_section:          \n\t"
+     : "=m" (lockf) : "m" (lockf) : "%eax"
+  );
+
+  /* If floating point emulation is enabled (CR0.EM = 1),
+   * executing an MMX/3DNow! instruction generates invalid
+   * opcode exception (#UD).
+   */
+  if (simd & (JSIMD_MMX | JSIMD_3DNOW)) {
+    if (!setjmp(jmpbuf)) {
+      signal(SIGILL, exception_handler);
+      __asm__ __volatile__ (
+        ".byte 0x0F,0x77"		/* emms */
+      );
+      signal(SIGILL, SIG_DFL);
+    } else {
+      simd &= ~(JSIMD_MMX | JSIMD_3DNOW);
+    }
+  }
+  if (simd & (JSIMD_SSE | JSIMD_SSE2)) {
+    if (!setjmp(jmpbuf)) {
+      signal(SIGILL, exception_handler);
+      __asm__ __volatile__ (
+        "leal  %0,%%eax        \n\t"
+        ".byte 0x0F,0xAE,0x10  \n\t"	/* ldmxcsr [eax] */
+         : : "m" (mxcsr) : "%eax"
+      );
+      signal(SIGILL, SIG_DFL);
+    } else {
+      simd &= ~(JSIMD_SSE | JSIMD_SSE2);
+    }
+  }
+
+  /* leave critical section */
+  lockf = 0;	/* release lock */
+#endif	/* __GNUC__ */
+
+  return simd;
+}