libavutil/common: clip nan value to amin

Changes av_clipf to return amin if a is nan.
Before if a is nan av_clipf_c returned nan and
av_clipf_sse would return amax. Now the both
should behave the same.

This works because nan > amin is false.
The max(nan, amin) will be amin.

Signed-off-by: James Almer <jamrial@gmail.com>

libavutil/common.h

@@ -379,6 +379,8 @@ static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b) {
 
 /**
  * Clip a float value into the amin-amax range.
+ * If a is nan or -inf amin will be returned.
+ * If a is +inf amax will be returned.
  * @param a value to clip
  * @param amin minimum value of the clip range
  * @param amax maximum value of the clip range
@@ -389,13 +391,13 @@ static av_always_inline av_const float av_clipf_c(float a, float amin, float ama
 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
     if (amin > amax) abort();
 #endif
-    if      (a < amin) return amin;
+    return FFMIN(FFMAX(a, amin), amax);
-    else if (a > amax) return amax;
-    else               return a;
 }
 
 /**
  * Clip a double value into the amin-amax range.
+ * If a is nan or -inf amin will be returned.
+ * If a is +inf amax will be returned.
  * @param a value to clip
  * @param amin minimum value of the clip range
  * @param amax maximum value of the clip range
@@ -406,9 +408,7 @@ static av_always_inline av_const double av_clipd_c(double a, double amin, double
 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
     if (amin > amax) abort();
 #endif
-    if      (a < amin) return amin;
+    return FFMIN(FFMAX(a, amin), amax);
-    else if (a > amax) return amax;
-    else               return a;
 }
 
 /** Compute ceil(log2(x)).

libavutil/x86/intmath.h

@@ -110,8 +110,8 @@ static av_always_inline av_const double av_clipd_sse2(double a, double amin, dou
 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
     if (amin > amax) abort();
 #endif
-    __asm__ ("minsd %2, %0 \n\t"
+    __asm__ ("maxsd %1, %0 \n\t"
-             "maxsd %1, %0 \n\t"
+             "minsd %2, %0 \n\t"
              : "+&x"(a) : "xm"(amin), "xm"(amax));
     return a;
 }
@@ -126,8 +126,8 @@ static av_always_inline av_const float av_clipf_sse(float a, float amin, float a
 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
     if (amin > amax) abort();
 #endif
-    __asm__ ("minss %2, %0 \n\t"
+    __asm__ ("maxss %1, %0 \n\t"
-             "maxss %1, %0 \n\t"
+             "minss %2, %0 \n\t"
              : "+&x"(a) : "xm"(amin), "xm"(amax));
     return a;
 }