Revision: 10355
Author: [email protected]
Date: Mon Jan 9 05:33:59 2012
Log: Use shift and add instead of mul on ARM for integer hash.
Review URL: http://codereview.chromium.org/9153002
http://code.google.com/p/v8/source/detail?r=10355
Modified:
/branches/bleeding_edge/src/arm/macro-assembler-arm.cc
=======================================
--- /branches/bleeding_edge/src/arm/macro-assembler-arm.cc Fri Jan 6
03:33:20 2012
+++ /branches/bleeding_edge/src/arm/macro-assembler-arm.cc Mon Jan 9
05:33:59 2012
@@ -1456,8 +1456,9 @@
// hash = hash ^ (hash >> 4);
eor(t0, t0, Operand(t0, LSR, 4));
// hash = hash * 2057;
- mov(t1, Operand(2057));
- mul(t0, t0, t1);
+ mov(t1, Operand(t0, LSL, 11));
+ add(t0, t0, Operand(t0, LSL, 3));
+ add(t0, t0, t1);
// hash = hash ^ (hash >> 16);
eor(t0, t0, Operand(t0, LSR, 16));
--
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