remove (now unused) SkDivBits

src/core/SkMath.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMathPriv.h"
 #include "SkFixed.h"
 #include "SkFloatBits.h"
@@ skipping 28 matching lines @@
     }
     if (x & 0x2) {
         sub_shift(zeros, x, 1);
     }
 
     return zeros;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
-#define DIVBITS_ITER(n)                                 \
-    case n:                                             \
-        if ((numer = (numer << 1) - denom) >= 0)        \
-            result |= 1 << (n - 1); else numer += denom
-
-int32_t SkDivBits(int32_t numer, int32_t denom, int shift_bias) {
-    SkASSERT(denom != 0);
-    if (numer == 0) {
-        return 0;
-    }
-
-    // make numer and denom positive, and sign hold the resulting sign
-    int32_t sign = SkExtractSign(numer ^ denom);
-    numer = SkAbs32(numer);
-    denom = SkAbs32(denom);
-
-    int nbits = SkCLZ(numer) - 1;
-    int dbits = SkCLZ(denom) - 1;
-    int bits = shift_bias - nbits + dbits;
-
-    if (bits < 0) {  // answer will underflow
-        return 0;
-    }
-    if (bits > 31) {  // answer will overflow
-        return SkApplySign(SK_MaxS32, sign);
-    }
-
-    denom <<= dbits;
-    numer <<= nbits;
-
-    SkFixed result = 0;
-
-    // do the first one
-    if ((numer -= denom) >= 0) {
-        result = 1;
-    } else {
-        numer += denom;
-    }
-
-    // Now fall into our switch statement if there are more bits to compute
-    if (bits > 0) {
-        // make room for the rest of the answer bits
-        result <<= bits;
-        switch (bits) {
-            DIVBITS_ITER(31); DIVBITS_ITER(30); DIVBITS_ITER(29);
-            DIVBITS_ITER(28); DIVBITS_ITER(27); DIVBITS_ITER(26);
-            DIVBITS_ITER(25); DIVBITS_ITER(24); DIVBITS_ITER(23);
-            DIVBITS_ITER(22); DIVBITS_ITER(21); DIVBITS_ITER(20);
-            DIVBITS_ITER(19); DIVBITS_ITER(18); DIVBITS_ITER(17);
-            DIVBITS_ITER(16); DIVBITS_ITER(15); DIVBITS_ITER(14);
-            DIVBITS_ITER(13); DIVBITS_ITER(12); DIVBITS_ITER(11);
-            DIVBITS_ITER(10); DIVBITS_ITER( 9); DIVBITS_ITER( 8);
-            DIVBITS_ITER( 7); DIVBITS_ITER( 6); DIVBITS_ITER( 5);
-            DIVBITS_ITER( 4); DIVBITS_ITER( 3); DIVBITS_ITER( 2);
-            // we merge these last two together, makes GCC make better ARM
-            default:
-            DIVBITS_ITER( 1);
-        }
-    }
-
-    if (result < 0) {
-        result = SK_MaxS32;
-    }
-    return SkApplySign(result, sign);
-}
-
 /* www.worldserver.com/turk/computergraphics/FixedSqrt.pdf
 */
 int32_t SkSqrtBits(int32_t x, int count) {
     SkASSERT(x >= 0 && count > 0 && (unsigned)count <= 30);
 
     uint32_t    root = 0;
     uint32_t    remHi = 0;
     uint32_t    remLo = x;
 
     do {
@@ skipping 22 matching lines @@
         if (SkScalarNearlyZero(*cosValue)) {
             *cosValue = 0;
         }
     }
 
     if (SkScalarNearlyZero(sinValue)) {
         sinValue = 0;
     }
     return sinValue;
 }