x86: cpu: whitespace (mostly) cosmetics

This adds whitespace around operators, aligns line continuation
backslashes, and breaks long lines.  Also fixes an ifdef halfway
through a statement.  The one line of duplication this saved is
not worth the ugliness.
Signed-off-by: Mans Rullgard <mans@mansr.com>

libavutil/x86/cpu.c

@@ -26,16 +26,15 @@
 #include "libavutil/cpu.h"
 
 /* ebx saving is necessary for PIC. gcc seems unable to see it alone */
-#define cpuid(index,eax,ebx,ecx,edx)\
-    __asm__ volatile\
-        ("mov %%"REG_b", %%"REG_S"\n\t"\
-         "cpuid\n\t"\
-         "xchg %%"REG_b", %%"REG_S\
-         : "=a" (eax), "=S" (ebx),\
-           "=c" (ecx), "=d" (edx)\
-         : "0" (index));
-
-#define xgetbv(index,eax,edx)                                   \
+#define cpuid(index, eax, ebx, ecx, edx)                        \
+    __asm__ volatile (                                          \
+        "mov    %%"REG_b", %%"REG_S" \n\t"                      \
+        "cpuid                       \n\t"                      \
+        "xchg   %%"REG_b", %%"REG_S                             \
+        : "=a" (eax), "=S" (ebx), "=c" (ecx), "=d" (edx)        \
+        : "0" (index))
+
+#define xgetbv(index, eax, edx)                                 \
     __asm__ (".byte 0x0f, 0x01, 0xd0" : "=a"(eax), "=d"(edx) : "c" (index))
 
 /* Function to test if multimedia instructions are supported...  */
@@ -43,8 +42,8 @@ int ff_get_cpu_flags_x86(void)
 {
     int rval = 0;
     int eax, ebx, ecx, edx;
-    int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
-    int family=0, model=0;
+    int max_std_level, max_ext_level, std_caps = 0, ext_caps = 0;
+    int family = 0, model = 0;
     union { int i[3]; char c[12]; } vendor;
 
 #if ARCH_X86_32
@@ -79,19 +78,20 @@ int ff_get_cpu_flags_x86(void)
     vendor.i[1] = edx;
     vendor.i[2] = ecx;
 
-    if(max_std_level >= 1){
+    if (max_std_level >= 1) {
         cpuid(1, eax, ebx, ecx, std_caps);
-        family = ((eax>>8)&0xf) + ((eax>>20)&0xff);
-        model  = ((eax>>4)&0xf) + ((eax>>12)&0xf0);
+        family = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
+        model  = ((eax >> 4) & 0xf) + ((eax >> 12) & 0xf0);
         if (std_caps & (1 << 15))
             rval |= AV_CPU_FLAG_CMOV;
-        if (std_caps & (1<<23))
+        if (std_caps & (1 << 23))
             rval |= AV_CPU_FLAG_MMX;
-        if (std_caps & (1<<25))
-            rval |= AV_CPU_FLAG_MMX2
+        if (std_caps & (1 << 25))
+            rval |= AV_CPU_FLAG_MMX2;
 #if HAVE_SSE
-                  | AV_CPU_FLAG_SSE;
-        if (std_caps & (1<<26))
+        if (std_caps & (1 << 25))
+            rval |= AV_CPU_FLAG_SSE;
+        if (std_caps & (1 << 26))
             rval |= AV_CPU_FLAG_SSE2;
         if (ecx & 1)
             rval |= AV_CPU_FLAG_SSE3;
@@ -111,20 +111,19 @@ int ff_get_cpu_flags_x86(void)
         }
 #endif
 #endif
-                  ;
     }
 
     cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
 
-    if(max_ext_level >= 0x80000001){
+    if (max_ext_level >= 0x80000001) {
         cpuid(0x80000001, eax, ebx, ecx, ext_caps);
-        if (ext_caps & (1U<<31))
+        if (ext_caps & (1U << 31))
             rval |= AV_CPU_FLAG_3DNOW;
-        if (ext_caps & (1<<30))
+        if (ext_caps & (1 << 30))
             rval |= AV_CPU_FLAG_3DNOWEXT;
-        if (ext_caps & (1<<23))
+        if (ext_caps & (1 << 23))
             rval |= AV_CPU_FLAG_MMX;
-        if (ext_caps & (1<<22))
+        if (ext_caps & (1 << 22))
             rval |= AV_CPU_FLAG_MMX2;
 
         /* Allow for selectively disabling SSE2 functions on AMD processors
@@ -151,14 +150,17 @@ int ff_get_cpu_flags_x86(void)
 
     if (!strncmp(vendor.c, "GenuineIntel", 12)) {
         if (family == 6 && (model == 9 || model == 13 || model == 14)) {
-            /* 6/9 (pentium-m "banias"), 6/13 (pentium-m "dothan"), and 6/14 (core1 "yonah")
-            * theoretically support sse2, but it's usually slower than mmx,
-            * so let's just pretend they don't. AV_CPU_FLAG_SSE2 is disabled and
-            * AV_CPU_FLAG_SSE2SLOW is enabled so that SSE2 is not used unless
-            * explicitly enabled by checking AV_CPU_FLAG_SSE2SLOW. The same
-            * situation applies for AV_CPU_FLAG_SSE3 and AV_CPU_FLAG_SSE3SLOW. */
-            if (rval & AV_CPU_FLAG_SSE2) rval ^= AV_CPU_FLAG_SSE2SLOW|AV_CPU_FLAG_SSE2;
-            if (rval & AV_CPU_FLAG_SSE3) rval ^= AV_CPU_FLAG_SSE3SLOW|AV_CPU_FLAG_SSE3;
+            /* 6/9 (pentium-m "banias"), 6/13 (pentium-m "dothan"), and
+             * 6/14 (core1 "yonah") theoretically support sse2, but it's
+             * usually slower than mmx, so let's just pretend they don't.
+             * AV_CPU_FLAG_SSE2 is disabled and AV_CPU_FLAG_SSE2SLOW is
+             * enabled so that SSE2 is not used unless explicitly enabled
+             * by checking AV_CPU_FLAG_SSE2SLOW. The same situation
+             * applies for AV_CPU_FLAG_SSE3 and AV_CPU_FLAG_SSE3SLOW. */
+            if (rval & AV_CPU_FLAG_SSE2)
+                rval ^= AV_CPU_FLAG_SSE2SLOW | AV_CPU_FLAG_SSE2;
+            if (rval & AV_CPU_FLAG_SSE3)
+                rval ^= AV_CPU_FLAG_SSE3SLOW | AV_CPU_FLAG_SSE3;
         }
         /* The Atom processor has SSSE3 support, which is useful in many cases,
          * but sometimes the SSSE3 version is slower than the SSE2 equivalent