Use shift and add instead of mul on ARM for integer hash.

Review URL: http://codereview.chromium.org/9153002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10355 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 470e322..fd9b568 100644 (file)
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -1456,8 +1456,9 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
   // 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));