[llvm-commits] [llvm] r42670 - /llvm/trunk/lib/Support/APInt.cpp

[Neil Booth]

Author: neil
Date: Fri Oct  5 19:43:45 2007
New Revision: 42670

URL: http://llvm.org/viewvc/llvm-project?rev=42670&view=rev
Log:
Fix and clarify some comments.

Modified:
    llvm/trunk/lib/Support/APInt.cpp

Modified: llvm/trunk/lib/Support/APInt.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/APInt.cpp?rev=42670&r1=42669&r2=42670&view=diff

==============================================================================
--- llvm/trunk/lib/Support/APInt.cpp (original)
+++ llvm/trunk/lib/Support/APInt.cpp Fri Oct  5 19:43:45 2007
@@ -2029,22 +2029,22 @@
     return ~(integerPart) 0 >> (integerPartWidth - bits);
   }
 
-  /* Returns the value of the lower nibble of PART.  */
+  /* Returns the value of the lower half of PART.  */
   inline integerPart
   lowHalf(integerPart part)
   {
     return part & lowBitMask(integerPartWidth / 2);
   }
 
-  /* Returns the value of the upper nibble of PART.  */
+  /* Returns the value of the upper half of PART.  */
   inline integerPart
   highHalf(integerPart part)
   {
     return part >> (integerPartWidth / 2);
   }
 
-  /* Returns the bit number of the most significant bit of a part.  If
-     the input number has no bits set -1U is returned.  */
+  /* Returns the bit number of the most significant set bit of a part.
+     If the input number has no bits set -1U is returned.  */
   unsigned int
   partMSB(integerPart value)
   {
@@ -2068,8 +2068,8 @@
     return msb;
   }
 
-  /* Returns the bit number of the least significant bit of a part.
-     If the input number has no bits set -1U is returned.  */
+  /* Returns the bit number of the least significant set bit of a
+     part.  If the input number has no bits set -1U is returned.  */
   unsigned int
   partLSB(integerPart value)
   {
@@ -2144,8 +2144,8 @@
   parts[bit / integerPartWidth] |= (integerPart) 1 << (bit % integerPartWidth);
 }
 
-/* Returns the bit number of the least significant bit of a number.
-   If the input number has no bits set -1U is returned.  */
+/* Returns the bit number of the least significant set bit of a
+   number.  If the input number has no bits set -1U is returned.  */
 unsigned int
 APInt::tcLSB(const integerPart *parts, unsigned int n)
 {
@@ -2162,8 +2162,8 @@
   return -1U;
 }
 
-/* Returns the bit number of the most significant bit of a number.  If
-   the input number has no bits set -1U is returned.  */
+/* Returns the bit number of the most significant set bit of a number.
+   If the input number has no bits set -1U is returned.  */
 unsigned int
 APInt::tcMSB(const integerPart *parts, unsigned int n)
 {
@@ -2240,8 +2240,8 @@
   tcIncrement(dst, parts);
 }
 
-/*  DST += SRC * MULTIPLIER + PART   if add is true
-    DST  = SRC * MULTIPLIER + PART   if add is false
+/*  DST += SRC * MULTIPLIER + CARRY   if add is true
+    DST  = SRC * MULTIPLIER + CARRY   if add is false
 
     Requires 0 <= DSTPARTS <= SRCPARTS + 1.  If DST overlaps SRC
     they must start at the same point, i.e. DST == SRC.