Reviewers: danno, fschneider,
Description:
Use type feedback for unary minus, improving the performance on e.g.
3d-cube by
7.2% and math-cordic by 5.7%.
Please review this at http://codereview.chromium.org/7013025/
SVN Base: http://v8.googlecode.com/svn/branches/bleeding_edge/
Affected files:
M src/hydrogen.cc
Index: src/hydrogen.cc
===================================================================
--- src/hydrogen.cc (revision 7874)
+++ src/hydrogen.cc (working copy)
@@ -4630,6 +4630,10 @@
CHECK_ALIVE(VisitForValue(expr->expression()));
HValue* value = Pop();
HInstruction* instr = new(zone()) HMul(value,
graph_->GetConstantMinus1());
+ TypeInfo info = oracle()->UnaryType(expr);
+ Representation rep = ToRepresentation(info);
+ TraceRepresentation(expr->op(), info, instr, rep);
+ AssumeRepresentation(instr, rep);
ast_context()->ReturnInstruction(instr, expr->id());
}
--
v8-dev mailing list
[email protected]
http://groups.google.com/group/v8-dev
