Title: [142336] trunk/Source/WTF
- Revision
- 142336
- Author
- [email protected]
- Date
- 2013-02-08 17:58:29 -0800 (Fri, 08 Feb 2013)
Log Message
ARM_NEON Inline Assembly for copyLCharsFromUCharSource() inefficient for aligned destinations
https://bugs.webkit.org/show_bug.cgi?id=109335
Reviewed by Filip Pizlo.
Change a "do while" to a "while" so that we don't copy single characters to align the
destination when it is already aligned.
* wtf/text/ASCIIFastPath.h:
(WTF::copyLCharsFromUCharSource):
Modified Paths
Diff
Modified: trunk/Source/WTF/ChangeLog (142335 => 142336)
--- trunk/Source/WTF/ChangeLog 2013-02-09 01:48:09 UTC (rev 142335)
+++ trunk/Source/WTF/ChangeLog 2013-02-09 01:58:29 UTC (rev 142336)
@@ -1,3 +1,16 @@
+2013-02-08 Michael Saboff <[email protected]>
+
+ ARM_NEON Inline Assembly for copyLCharsFromUCharSource() inefficient for aligned destinations
+ https://bugs.webkit.org/show_bug.cgi?id=109335
+
+ Reviewed by Filip Pizlo.
+
+ Change a "do while" to a "while" so that we don't copy single characters to align the
+ destination when it is already aligned.
+
+ * wtf/text/ASCIIFastPath.h:
+ (WTF::copyLCharsFromUCharSource):
+
2013-02-08 Jer Noble <[email protected]>
Bring WebKit up to speed with latest Encrypted Media spec.
Modified: trunk/Source/WTF/wtf/text/ASCIIFastPath.h (142335 => 142336)
--- trunk/Source/WTF/wtf/text/ASCIIFastPath.h 2013-02-09 01:48:09 UTC (rev 142335)
+++ trunk/Source/WTF/wtf/text/ASCIIFastPath.h 2013-02-09 01:58:29 UTC (rev 142336)
@@ -138,9 +138,8 @@
if (length >= (2 * memoryAccessSize) - 1) {
// Prefix: align dst on 64 bits.
const uintptr_t memoryAccessMask = memoryAccessSize - 1;
- do {
+ while (!isAlignedTo<memoryAccessMask>(destination))
*destination++ = static_cast<LChar>(*source++);
- } while (!isAlignedTo<memoryAccessMask>(destination));
// Vector interleaved unpack, we only store the lower 8 bits.
const uintptr_t lengthLeft = end - destination;
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